Advanced Materials and Devices : [118]

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 118
  • Electrochromic properties of sol–gel prepared hybrid transition metal oxides – A short review.pdf.jpg
  • Article


  • Authors: Jittiarporn, Phuriwat; Badilescu, Simona; Al Sawafta, Mohammed N.; Sikong, Lek; Vo, VanTruong (2017)

  • This short review revisits the progress achieved in the last 10–15 years in the field of hybrid electrochromic materials, synthesized through sol–gel methods. New research directions in the field of electrochromism (EC), together with novel applications of many electrochromic hybrid oxides are discussed here. Among them, the discoveries in the field of synthesis of nanomaterials enabled to expand the materials and connect the morphological features of nanoparticles to the electrochromic properties at the macro level. The development of novel hybrid materials with significantly improved EC properties, where tungsten oxide is associated with carbonaceous materials such as MWCNT or graph...

  • Time and pressure dependent deformation of microcontact printed channels fabricated using self-assembled monolayers of alkanethiol on gold.pdf.jpg
  • Article


  • Authors: Uddin, M. Jalal; Hossain, M. Khalid; Qarony, Wayesh; Hossain, Mohammad I.; Mia, M.N.H.; Hossen, S. (2017)

  • In this work, the replication-based microcontact printing method has been presented to study the deformation effect of different printing times and printing pressures on the microcontact printed structures. Cost-effective microcontact printing channels of self-assembled monolayers of alkanethiol have been prepared on gold surface. The alkanethiol inking the polydimethylsiloxanes stamp effectively forms the self-assembled monolayers on the noble gold surface that protects the metal against etchant solution and thereby forms channel-like structures. To address the deformation issue, variations in the printing time in the range of 30 s–60 min and the printing pressure ranging from 840 to...

  • Three-dimensional-printing-of-biological-matters_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Ahmed Munaz; Raja K. Vadivelu; James St. John; Matthew Barton; Harshad Kamble; Nam-Trung Nguyen (2016)

  • Three-dimensional (3D) printing of human tissues and organ has been an exciting research topic in the past three decades. However, existing technological and biological challenges still require a significant amount of research. The present review highlights these challenges and discusses their potential solu-tions such as mapping and converting a human organ onto a 3D virtual design, synchronizing the virtual design with the printing hardware. Moreover, the paper discusses in details recent advances in formu-lating bio-inks and challenges in tissue construction with or without scaffold. Next, the paper reviews fusion processes effecting vascular cells and tissues. Finally, the paper...

  • Theoretical-methods-for-understanding-advanced-magnetic-materials-The-case-of-frustrated-thin-films_2016_Journal-of-Science-Advanced-Materials-and-Dev.pdf.jpg
  • Article


  • Authors: H.T. Diep (2016)

  • Materials science has been intensively developed during the last 30 years. This is due, on the one hand, to an increasing demand of new materials for new applications and, on the other hand, to technological progress which allows for the synthesis of materials of desired characteristics and to investigate their properties with sophisticated experimental apparatus. Among these advanced materials, magnetic ma-terials at nanometric scale such as ultra thinfilms or ultrafine aggregates are no doubt among the most important for electronic devices. In this review, we show advanced theoretical methods and solved examples that help understand microscopic mechanisms leading to experimental ...

  • Synthesis-of-ZnS-Mn-Fe3O4-bifunctional-nanoparticles-by-inverse-microemulsion-method_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Chu, Tien Dung; Luu, Manh Quynh; Nguyen, Phuong Linh; Nguyen, Hoang Luong; Nguyen, Hoang Nam (2016)

  • ZnS:Mn- Fe3O4 bifunctional nanoparticles were synthesized by inverse microemulsion method for biomedicine applications. The bifunctional nanoparticles were combined from prepared ZnS:Mn and Fe3O4 nanoparticles in a SiO2 cover matrix. Results show that bifunctional nanoparticles, apart from exhibiting magnetism, have photoluminescence properties, which support the applications targeting biomedicine fluorescent diagnostics as well as magnetic cell sorting or drug delivery.

  • Synthesis-and-optical-properties-of-red-blue-emitting-Sr2MgSi2O7-Eu3-Eu2-phosphors-for-white-LED_2016_Journal-of-Science-Advanced-Materials-and-Device.pdf.jpg
  • Article


  • Authors: Tong, Thi Hao Tam; Nguyen, Duy Hung; Nguyen, Thi Kim Lien; Nguyen, Duc Trung Kien; Pham, Thanh Huy (2016)

  • Phosphor-converted white light emitting diodes (white LEDs) have received great attention in recent years since they have several excellent features such as high lumen output, low power consumption, long lifetime and environmentally friendly. In this work, we report the co-precipitation synthesis of red/blue Sr2MgSi2O7:Eu 3+ /Eu 2+ phosphors with various Eu doping concentration. The results show that the ob-tained Sr2MgSi2O7:Eu 3+ /Eu 2+ phosphors have good crystallinity and emit strong red (Sr2MgSi2O7:Eu 3+ ) and blue (Sr2MgSi2O7:Eu 2+) emissions under near UV light excitation. The sharp emission peaks at 577, 590, 612, 653, and 701 nm corresponded to the typical 5 D0/7 Fj (j=0,1...

  • Synthesis-and-gas-sensing-characteristics-of-Fe2O3-hollow-balls_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Nguyen, Duc Hoa; Chu, Manh Hung,; Nguyen, Van Toan; Dang, Thi Thanh Le; Nguyen, Van Duy; Nguyen, Van Hieu (2016)

  • The synthesis of porous metal-oxide semiconductors for gas-sensing application is attracting increased interest. In this study, a-Fe2O3 hollow balls were synthesized using an inexpensive, scalable, and template-free hydrothermal method. The gas-sensing characteristics of the semiconductors were sys-tematically investigated. Material characterization by XRD, SEM, HRTEM, and EDS reveals that single-phasea-Fe2O3hollow balls with an average diameter of 1.5 um were obtained. The hollow balls were formed by self assembly of a-Fe2O3 nanoparticles with an average diameter of 100 nm. The hollow structure and nanopores between the nanoparticles resulted in the significantly high response of...

  • Switchable-and-tunable-metamaterial-absorber-in-THz-frequencies_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Dang, Hong Luu; Nguyen, Van Dung; Trinh, Thi Giang; Vu, Dinh Lam (2016)

  • We demonstrated a metamaterial absorber (MMA), which can be controlled by variation of conductivity or temperature. The metamaterial (MM) structure is based on three individual layers of periodic split ring resonator (SRR), a dielectric, and metallic film. The resonant frequency of the designed structure is numerically investigated at THz range of electromagnetic (EM) wave, which is explained by surface current and equivalent LC-circuit. It was found that by replacing the metallicfilm with VO2, the ab-sorption intensity can be controlled by modification of the conductivity through the optical pumping power, while the absorption frequency is tuned by changing the temperature of InS...

  • Multiwalled-carbon-nanotubes-silver-nanocomposite-as-effective-SERS-platform-for-detection-of-methylene-blue-dye-in-water_2016_Journal-of-Science-Adva.pdf.jpg
  • Article


  • Authors: Ngo, Xuan Dinh; Tran, Quang Huy; Le, Van Vu; Le, Thi Tam; Anh-Tuan Le (2016)

  • In this work, a functional nanocomposite consisting of silver nanoparticles and multiwalled carbon nanotubes (MWCNTs-Ag) was successfully synthesized using a two-step chemical process. The MWCNTs-Ag nanocomposite has been studied as a surface-enhanced Raman scattering (SERS) sensing platform for detection of methylene blue (MB) dye in an aqueous medium. The obtained results reveal that the MWCNTs-Ag nanocomposite exhibits higher SERS detection activity than that of pure Ag-nanoparticles (Ag-NPs). The calculated enhancement factors are 1.51 x 10 6 for pure Ag-NPs and 4.68 x 10 6 for the MWCNTs-Ag nanocomposite. MB detection has been achieved as low as 1 ppm. The SERS enhancement ...

  • Magnetic-properties-of-CoxPt100-x-nanoparticles_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Truong, Thanh Trung; Do, Thi Nhung; Nguyen, Thi Thanh Van; Nguyen, Hoang Nam; Nguyen, Hoang Luong (2016)

  • CoxPt100- x nanoparticles (x=50, 59, and 73) were prepared by the chemical reduction of Cobalt (II) chloride and Chloroplatinic acid, then ultrasonicated for 2 h. After annealing at various temperatures from 450 C to 700 C for 1 h, structure change was observed and samples show hard magnetic prop-erties which depend strongly on chemical composition and annealing temperature. The highest coer-civity value of 1.15 kOe was obtained at room temperature for sample with x =50 annealed at 500 C. Chemical reduction combined with ultrasound is a useful method to prepare CoPt nanoparticles

  • Magnetic-properties-of-a-LuVO3-single-crystal-studied-by-magnetometry-heat-capacity-and-neutron-diffraction_2016_Journal-of-Science-Advanced-Materials.pdf.jpg
  • Article


  • Authors: L.D. Tung; J. Schefer; M.R. Lees; G. Balakrishnan; D.McK. Paul (2016)

  • We have studied the magnetic properties of a LuVO3 single crystal. The compound shows an orbital ordering at TOO= 179 K followed by the antiferromagnetic spin ordering at TSO =109 K. In the magnetically ordered regime, there appears an abrupt change at To =82.5 K in the magnetisation, indicating a first-order transition. The compound has very large negative Weiss temperature observed along all the main crystallographic axes, suggesting a strong antiferromagnetic correlations in the paramagnetic state. The observation of hysteresis curves in the collinear antiferromagnetic regime is discussed in terms of an inhomogeneity generating some spins with weak localfields in a strongly antife...

  • Low-temperature-PZT-thin-film-ferroelectric-memories-fabricated-on-SiO2-Si-and-glass-substrates_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: D.H. Minh; N.V. Lo; N.H. Duc; B.N.Q. Trinh (2016)

  • In a ferroelectric-gate thin film transistor memory (FGT) type structure, the gate-insulator layer is extremely important for inducing the charge when accumulating or depleting. We concentrated on the application of low-temperature PZTfilms crystallized at 450, 500 and 550 C, instead of at conventional high temperatures ( 600 C). Investigation of the crystalline structure and electrical properties indicated that the PZTfilm, crystallized at 500 C, was suitable for FGT fabrication because of a high (111) orien-tation, large remnant polarization of 38 aC/cm 2 on SiO2/Si substrate and 17.8 aC/cm 2 on glass, and low leakage current of 10- 6A/cm 2 . In sequence, we successfully fabricate...

  • Hydrogen-storage-characteristics-of-Ti-and-V-based-thin-films_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Z. Tarnawski; N.-T.H. Kim-Ngan (2016)

  • Series of thin films of single-, bi- and tri-layered structure consisting of Ti, V, TiO2 and V2O5 layer and/or mixed Ti- V- Ni layer with different layer sequences and thicknesses were prepared by the sputtering technique on Si and SiO2 substrates. The layer chemical composition and thickness were determined by a combined analysis of X-ray diffraction, X-ray reflectometry, Rutherford backscattering and optical reflectivity spectra. Thefilms were hydrogenated at 1 bar at 300 C and/or at high pressures up to 100 bar at room temperature. The hydrogen concentration and hydrogen profile was determined by means of a secondary ion mass spectroscopy and N-15 Nuclear Reaction Analysis. The ...

  • High-field-transport-properties-of-itinerant-electron-metamagnetic-Co-S1-xSex-2_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Hirofumi, Wada; Yoshiro, Maekawa; Daichi, Kawasaki (2016)

  • The Co(S1-xSex)2 compounds are known to exhibit itinerant electron metamagnetism (IEM). We present field dependence of electrical resistivity and Hall effect of the compounds with 0 x<0.15. It was found that the magnetoresistance shows a positive jump associated with the IEM. This jump is nearly inde-pendent of temperature. We also observed a jump in the field dependence of Hall resistivity, which is attributable to the anomalous Hall effect due to the onset of ferromagnetism. Our analyses revealed that the ordinary Hall coefficient decreases considerably by the IEM. These results are discussed in terms of the proposed electronic structure of CoS2, in which a highly spin polarize...

  • Fabrication-and-characterization-of-PZT-string-based-MEMS-devices_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: D.T. Huong Giang; N.H. Duc; G. Agnus; T. Maroutian; P. Lecoeur (2016)

  • String based MEMS devices recently attract world technology development thanks to their advantages over cantilever ones. Approaching to this direction, the paper reports on the micro-fabrication and characterization of free-standing doubly clamped piezoelectric beams based on heterostructures of Pd/ FeNi/Pd/PZT/LSMO/STO/Si. The displacement of strings is investigated in both static and dynamic mode. The static response exhibits a bending displacement as large as 1.2 am, whereas the dynamic response shows a strong resonance with a high quality factor of around 35 depending on the resonant mode at atmospheric pressure. These findings are comparable with those observed in large dim...

  • Transport-phenomena-and-conductivity-mechanism-in-Sm-doped-Bi4V2-xSmxO11-ceramics_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Sasmitarani Bag; Banarji Behera (2016)

  • The polycrystalline samples of Sm doped Bi4V2 -xSmxO11 with x = 0.05, 0.10, 0.15 and 0.20 ceramics were prepared by using solid-state reaction technique. The structural characterization of the prepared samples were confirmed by X-ray powder diffraction (XRD) and showed an orthorhombic and monoclinic phase. The nature of Nyquist plot confirms the presence of both grain and grain boundary effects for all Sm doped compounds. The grain resistance decreases with rise in temperature for all the samples and exhibits a typical negative temperature co-efficient of resistance (NTCR) behavior. The ac conductivity spectrum obeys Jonscher's universal power law. The modulus analysis suggests a poss...

  • The-effect-of-fibrin-sealant-on-bioactive-glass-S53P4-particles-pH-impact-and-dissolution-characteristics-in-vitro_2016_Journal-of-Science-Advanced-Ma.pdf.jpg
  • Article


  • Authors: Jussi Sarin; Leena Bjorkvik; Markus Hiltunen; Leena Hupa; Jaakko Pulkkinen; Pekka K. Vallittu (2016)

  • Fibrin glue, a two-component tissue adhesive, has a range of clinical indications. Bioactive glass (BG) S53P4 has been approved for clinical use in several craniomaxillofacial and orthopedic applications. Although sometimes used simultaneously, there is no data available regarding the possible interaction of these two biocompatible substances. In this in vitro study, using a BG particle concentration of 4 mg/ml, a 0.4 unit pH increment (p < 0.001) was observed in simulated body fluid (SBF) after a 7-day incubation period. The addition of fibrin glue (0.13 g, SD 0.04; or 3.7 mg/ml) on top of the BG particles raised further the pH by 0.5 units (p < 0.001). The difference between these ...

  • Surface-modification-of-polyamide-thin-film-composite-membrane-by-coating-of-titanium-dioxide-nanoparticles_2016_Journal-of-Science-Advanced-Materials.pdf.jpg
  • Article


  • Authors: Ngo, Thu Hong Anh; Nguyen, Dung The; Do, Khai Dinh; Nguyen, Thu Thi Minh; Shinsuke Mori; Tran, Dung Thi (2016)

  • In this paper, the coating of TiO2 nanoparticles onto the surface of a polyamide thin film composite nanofiltration membrane has been studied. Changes in the properties and separation performance of the modified membranes were systematically characterized. The experimental results indicated that the membrane surface hydrophilicity was significantly improved by the presence of the coated TiO2 nano-particles with subsequent UV irradiation. The separation performance of the UV-irradiated TiO2-coated membranes was improved with a great enhancement of flux and a very high retention for removal of residual dye in an aqueous feed solution. The antifouling property of the UV-irradiated TiO2-c...

  • Structural-and-mechanical-properties-of-microwave-sintered-AlNi50Ti50-composites_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Penchal Reddy, M.; Ubaid, F.; Shakoor, R.A.; Mohamed, A.M.A.; Madhuri, W. (2016)

  • Metal matrix composites (MMCs) have become attractive for structural engineering applications due to their excellent specific strength and are becoming an alternative to the conventional materials particularly in the automotive, aerospace and defence industries. The present work aims to synthesize and characterize the Al-Ni50Ti50 composites using microwave sintering technique with various weight fractions of reinforced particles. Ni-based metallic glass (Ni50Ti50) powders were prepared by mechanical alloying. The microstructure and mechanical properties of Al-Ni50Ti50 composites were examined by Xray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness and compressi...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 118

Advanced Materials and Devices : [118]

Follow this collection to receive daily e-mail notification of new additions
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 118
  • Electrochromic properties of sol–gel prepared hybrid transition metal oxides – A short review.pdf.jpg
  • Article


  • Authors: Jittiarporn, Phuriwat; Badilescu, Simona; Al Sawafta, Mohammed N.; Sikong, Lek; Vo, VanTruong (2017)

  • This short review revisits the progress achieved in the last 10–15 years in the field of hybrid electrochromic materials, synthesized through sol–gel methods. New research directions in the field of electrochromism (EC), together with novel applications of many electrochromic hybrid oxides are discussed here. Among them, the discoveries in the field of synthesis of nanomaterials enabled to expand the materials and connect the morphological features of nanoparticles to the electrochromic properties at the macro level. The development of novel hybrid materials with significantly improved EC properties, where tungsten oxide is associated with carbonaceous materials such as MWCNT or graph...

  • Time and pressure dependent deformation of microcontact printed channels fabricated using self-assembled monolayers of alkanethiol on gold.pdf.jpg
  • Article


  • Authors: Uddin, M. Jalal; Hossain, M. Khalid; Qarony, Wayesh; Hossain, Mohammad I.; Mia, M.N.H.; Hossen, S. (2017)

  • In this work, the replication-based microcontact printing method has been presented to study the deformation effect of different printing times and printing pressures on the microcontact printed structures. Cost-effective microcontact printing channels of self-assembled monolayers of alkanethiol have been prepared on gold surface. The alkanethiol inking the polydimethylsiloxanes stamp effectively forms the self-assembled monolayers on the noble gold surface that protects the metal against etchant solution and thereby forms channel-like structures. To address the deformation issue, variations in the printing time in the range of 30 s–60 min and the printing pressure ranging from 840 to...

  • Three-dimensional-printing-of-biological-matters_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Ahmed Munaz; Raja K. Vadivelu; James St. John; Matthew Barton; Harshad Kamble; Nam-Trung Nguyen (2016)

  • Three-dimensional (3D) printing of human tissues and organ has been an exciting research topic in the past three decades. However, existing technological and biological challenges still require a significant amount of research. The present review highlights these challenges and discusses their potential solu-tions such as mapping and converting a human organ onto a 3D virtual design, synchronizing the virtual design with the printing hardware. Moreover, the paper discusses in details recent advances in formu-lating bio-inks and challenges in tissue construction with or without scaffold. Next, the paper reviews fusion processes effecting vascular cells and tissues. Finally, the paper...

  • Theoretical-methods-for-understanding-advanced-magnetic-materials-The-case-of-frustrated-thin-films_2016_Journal-of-Science-Advanced-Materials-and-Dev.pdf.jpg
  • Article


  • Authors: H.T. Diep (2016)

  • Materials science has been intensively developed during the last 30 years. This is due, on the one hand, to an increasing demand of new materials for new applications and, on the other hand, to technological progress which allows for the synthesis of materials of desired characteristics and to investigate their properties with sophisticated experimental apparatus. Among these advanced materials, magnetic ma-terials at nanometric scale such as ultra thinfilms or ultrafine aggregates are no doubt among the most important for electronic devices. In this review, we show advanced theoretical methods and solved examples that help understand microscopic mechanisms leading to experimental ...

  • Synthesis-of-ZnS-Mn-Fe3O4-bifunctional-nanoparticles-by-inverse-microemulsion-method_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Chu, Tien Dung; Luu, Manh Quynh; Nguyen, Phuong Linh; Nguyen, Hoang Luong; Nguyen, Hoang Nam (2016)

  • ZnS:Mn- Fe3O4 bifunctional nanoparticles were synthesized by inverse microemulsion method for biomedicine applications. The bifunctional nanoparticles were combined from prepared ZnS:Mn and Fe3O4 nanoparticles in a SiO2 cover matrix. Results show that bifunctional nanoparticles, apart from exhibiting magnetism, have photoluminescence properties, which support the applications targeting biomedicine fluorescent diagnostics as well as magnetic cell sorting or drug delivery.

  • Synthesis-and-optical-properties-of-red-blue-emitting-Sr2MgSi2O7-Eu3-Eu2-phosphors-for-white-LED_2016_Journal-of-Science-Advanced-Materials-and-Device.pdf.jpg
  • Article


  • Authors: Tong, Thi Hao Tam; Nguyen, Duy Hung; Nguyen, Thi Kim Lien; Nguyen, Duc Trung Kien; Pham, Thanh Huy (2016)

  • Phosphor-converted white light emitting diodes (white LEDs) have received great attention in recent years since they have several excellent features such as high lumen output, low power consumption, long lifetime and environmentally friendly. In this work, we report the co-precipitation synthesis of red/blue Sr2MgSi2O7:Eu 3+ /Eu 2+ phosphors with various Eu doping concentration. The results show that the ob-tained Sr2MgSi2O7:Eu 3+ /Eu 2+ phosphors have good crystallinity and emit strong red (Sr2MgSi2O7:Eu 3+ ) and blue (Sr2MgSi2O7:Eu 2+) emissions under near UV light excitation. The sharp emission peaks at 577, 590, 612, 653, and 701 nm corresponded to the typical 5 D0/7 Fj (j=0,1...

  • Synthesis-and-gas-sensing-characteristics-of-Fe2O3-hollow-balls_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Nguyen, Duc Hoa; Chu, Manh Hung,; Nguyen, Van Toan; Dang, Thi Thanh Le; Nguyen, Van Duy; Nguyen, Van Hieu (2016)

  • The synthesis of porous metal-oxide semiconductors for gas-sensing application is attracting increased interest. In this study, a-Fe2O3 hollow balls were synthesized using an inexpensive, scalable, and template-free hydrothermal method. The gas-sensing characteristics of the semiconductors were sys-tematically investigated. Material characterization by XRD, SEM, HRTEM, and EDS reveals that single-phasea-Fe2O3hollow balls with an average diameter of 1.5 um were obtained. The hollow balls were formed by self assembly of a-Fe2O3 nanoparticles with an average diameter of 100 nm. The hollow structure and nanopores between the nanoparticles resulted in the significantly high response of...

  • Switchable-and-tunable-metamaterial-absorber-in-THz-frequencies_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Dang, Hong Luu; Nguyen, Van Dung; Trinh, Thi Giang; Vu, Dinh Lam (2016)

  • We demonstrated a metamaterial absorber (MMA), which can be controlled by variation of conductivity or temperature. The metamaterial (MM) structure is based on three individual layers of periodic split ring resonator (SRR), a dielectric, and metallic film. The resonant frequency of the designed structure is numerically investigated at THz range of electromagnetic (EM) wave, which is explained by surface current and equivalent LC-circuit. It was found that by replacing the metallicfilm with VO2, the ab-sorption intensity can be controlled by modification of the conductivity through the optical pumping power, while the absorption frequency is tuned by changing the temperature of InS...

  • Multiwalled-carbon-nanotubes-silver-nanocomposite-as-effective-SERS-platform-for-detection-of-methylene-blue-dye-in-water_2016_Journal-of-Science-Adva.pdf.jpg
  • Article


  • Authors: Ngo, Xuan Dinh; Tran, Quang Huy; Le, Van Vu; Le, Thi Tam; Anh-Tuan Le (2016)

  • In this work, a functional nanocomposite consisting of silver nanoparticles and multiwalled carbon nanotubes (MWCNTs-Ag) was successfully synthesized using a two-step chemical process. The MWCNTs-Ag nanocomposite has been studied as a surface-enhanced Raman scattering (SERS) sensing platform for detection of methylene blue (MB) dye in an aqueous medium. The obtained results reveal that the MWCNTs-Ag nanocomposite exhibits higher SERS detection activity than that of pure Ag-nanoparticles (Ag-NPs). The calculated enhancement factors are 1.51 x 10 6 for pure Ag-NPs and 4.68 x 10 6 for the MWCNTs-Ag nanocomposite. MB detection has been achieved as low as 1 ppm. The SERS enhancement ...

  • Magnetic-properties-of-CoxPt100-x-nanoparticles_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Truong, Thanh Trung; Do, Thi Nhung; Nguyen, Thi Thanh Van; Nguyen, Hoang Nam; Nguyen, Hoang Luong (2016)

  • CoxPt100- x nanoparticles (x=50, 59, and 73) were prepared by the chemical reduction of Cobalt (II) chloride and Chloroplatinic acid, then ultrasonicated for 2 h. After annealing at various temperatures from 450 C to 700 C for 1 h, structure change was observed and samples show hard magnetic prop-erties which depend strongly on chemical composition and annealing temperature. The highest coer-civity value of 1.15 kOe was obtained at room temperature for sample with x =50 annealed at 500 C. Chemical reduction combined with ultrasound is a useful method to prepare CoPt nanoparticles

  • Magnetic-properties-of-a-LuVO3-single-crystal-studied-by-magnetometry-heat-capacity-and-neutron-diffraction_2016_Journal-of-Science-Advanced-Materials.pdf.jpg
  • Article


  • Authors: L.D. Tung; J. Schefer; M.R. Lees; G. Balakrishnan; D.McK. Paul (2016)

  • We have studied the magnetic properties of a LuVO3 single crystal. The compound shows an orbital ordering at TOO= 179 K followed by the antiferromagnetic spin ordering at TSO =109 K. In the magnetically ordered regime, there appears an abrupt change at To =82.5 K in the magnetisation, indicating a first-order transition. The compound has very large negative Weiss temperature observed along all the main crystallographic axes, suggesting a strong antiferromagnetic correlations in the paramagnetic state. The observation of hysteresis curves in the collinear antiferromagnetic regime is discussed in terms of an inhomogeneity generating some spins with weak localfields in a strongly antife...

  • Low-temperature-PZT-thin-film-ferroelectric-memories-fabricated-on-SiO2-Si-and-glass-substrates_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: D.H. Minh; N.V. Lo; N.H. Duc; B.N.Q. Trinh (2016)

  • In a ferroelectric-gate thin film transistor memory (FGT) type structure, the gate-insulator layer is extremely important for inducing the charge when accumulating or depleting. We concentrated on the application of low-temperature PZTfilms crystallized at 450, 500 and 550 C, instead of at conventional high temperatures ( 600 C). Investigation of the crystalline structure and electrical properties indicated that the PZTfilm, crystallized at 500 C, was suitable for FGT fabrication because of a high (111) orien-tation, large remnant polarization of 38 aC/cm 2 on SiO2/Si substrate and 17.8 aC/cm 2 on glass, and low leakage current of 10- 6A/cm 2 . In sequence, we successfully fabricate...

  • Hydrogen-storage-characteristics-of-Ti-and-V-based-thin-films_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Z. Tarnawski; N.-T.H. Kim-Ngan (2016)

  • Series of thin films of single-, bi- and tri-layered structure consisting of Ti, V, TiO2 and V2O5 layer and/or mixed Ti- V- Ni layer with different layer sequences and thicknesses were prepared by the sputtering technique on Si and SiO2 substrates. The layer chemical composition and thickness were determined by a combined analysis of X-ray diffraction, X-ray reflectometry, Rutherford backscattering and optical reflectivity spectra. Thefilms were hydrogenated at 1 bar at 300 C and/or at high pressures up to 100 bar at room temperature. The hydrogen concentration and hydrogen profile was determined by means of a secondary ion mass spectroscopy and N-15 Nuclear Reaction Analysis. The ...

  • High-field-transport-properties-of-itinerant-electron-metamagnetic-Co-S1-xSex-2_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Hirofumi, Wada; Yoshiro, Maekawa; Daichi, Kawasaki (2016)

  • The Co(S1-xSex)2 compounds are known to exhibit itinerant electron metamagnetism (IEM). We present field dependence of electrical resistivity and Hall effect of the compounds with 0 x<0.15. It was found that the magnetoresistance shows a positive jump associated with the IEM. This jump is nearly inde-pendent of temperature. We also observed a jump in the field dependence of Hall resistivity, which is attributable to the anomalous Hall effect due to the onset of ferromagnetism. Our analyses revealed that the ordinary Hall coefficient decreases considerably by the IEM. These results are discussed in terms of the proposed electronic structure of CoS2, in which a highly spin polarize...

  • Fabrication-and-characterization-of-PZT-string-based-MEMS-devices_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: D.T. Huong Giang; N.H. Duc; G. Agnus; T. Maroutian; P. Lecoeur (2016)

  • String based MEMS devices recently attract world technology development thanks to their advantages over cantilever ones. Approaching to this direction, the paper reports on the micro-fabrication and characterization of free-standing doubly clamped piezoelectric beams based on heterostructures of Pd/ FeNi/Pd/PZT/LSMO/STO/Si. The displacement of strings is investigated in both static and dynamic mode. The static response exhibits a bending displacement as large as 1.2 am, whereas the dynamic response shows a strong resonance with a high quality factor of around 35 depending on the resonant mode at atmospheric pressure. These findings are comparable with those observed in large dim...

  • Transport-phenomena-and-conductivity-mechanism-in-Sm-doped-Bi4V2-xSmxO11-ceramics_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Sasmitarani Bag; Banarji Behera (2016)

  • The polycrystalline samples of Sm doped Bi4V2 -xSmxO11 with x = 0.05, 0.10, 0.15 and 0.20 ceramics were prepared by using solid-state reaction technique. The structural characterization of the prepared samples were confirmed by X-ray powder diffraction (XRD) and showed an orthorhombic and monoclinic phase. The nature of Nyquist plot confirms the presence of both grain and grain boundary effects for all Sm doped compounds. The grain resistance decreases with rise in temperature for all the samples and exhibits a typical negative temperature co-efficient of resistance (NTCR) behavior. The ac conductivity spectrum obeys Jonscher's universal power law. The modulus analysis suggests a poss...

  • The-effect-of-fibrin-sealant-on-bioactive-glass-S53P4-particles-pH-impact-and-dissolution-characteristics-in-vitro_2016_Journal-of-Science-Advanced-Ma.pdf.jpg
  • Article


  • Authors: Jussi Sarin; Leena Bjorkvik; Markus Hiltunen; Leena Hupa; Jaakko Pulkkinen; Pekka K. Vallittu (2016)

  • Fibrin glue, a two-component tissue adhesive, has a range of clinical indications. Bioactive glass (BG) S53P4 has been approved for clinical use in several craniomaxillofacial and orthopedic applications. Although sometimes used simultaneously, there is no data available regarding the possible interaction of these two biocompatible substances. In this in vitro study, using a BG particle concentration of 4 mg/ml, a 0.4 unit pH increment (p < 0.001) was observed in simulated body fluid (SBF) after a 7-day incubation period. The addition of fibrin glue (0.13 g, SD 0.04; or 3.7 mg/ml) on top of the BG particles raised further the pH by 0.5 units (p < 0.001). The difference between these ...

  • Surface-modification-of-polyamide-thin-film-composite-membrane-by-coating-of-titanium-dioxide-nanoparticles_2016_Journal-of-Science-Advanced-Materials.pdf.jpg
  • Article


  • Authors: Ngo, Thu Hong Anh; Nguyen, Dung The; Do, Khai Dinh; Nguyen, Thu Thi Minh; Shinsuke Mori; Tran, Dung Thi (2016)

  • In this paper, the coating of TiO2 nanoparticles onto the surface of a polyamide thin film composite nanofiltration membrane has been studied. Changes in the properties and separation performance of the modified membranes were systematically characterized. The experimental results indicated that the membrane surface hydrophilicity was significantly improved by the presence of the coated TiO2 nano-particles with subsequent UV irradiation. The separation performance of the UV-irradiated TiO2-coated membranes was improved with a great enhancement of flux and a very high retention for removal of residual dye in an aqueous feed solution. The antifouling property of the UV-irradiated TiO2-c...

  • Structural-and-mechanical-properties-of-microwave-sintered-AlNi50Ti50-composites_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Penchal Reddy, M.; Ubaid, F.; Shakoor, R.A.; Mohamed, A.M.A.; Madhuri, W. (2016)

  • Metal matrix composites (MMCs) have become attractive for structural engineering applications due to their excellent specific strength and are becoming an alternative to the conventional materials particularly in the automotive, aerospace and defence industries. The present work aims to synthesize and characterize the Al-Ni50Ti50 composites using microwave sintering technique with various weight fractions of reinforced particles. Ni-based metallic glass (Ni50Ti50) powders were prepared by mechanical alloying. The microstructure and mechanical properties of Al-Ni50Ti50 composites were examined by Xray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness and compressi...

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