Advanced Materials and Devices : [311]

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 311
  • Three-dimensional lion's mane like AlV3O9 deposited on graphene.pdf.jpg
  • Article


  • Authors: Low, Wei Hau; Lim, Siew Shee; Chia, Chin Hua; Siong, Chiu Wee; Khiew, Poi Sim (2020)

  • 3D lion's mane like AlV3O9 microspheres deposited on the well-exfoliated graphene were successfully synthesised through a facile solvothermal method where the graphene sheet was prepared solely via the liquid phase exfoliation process. The highly electrical conductive graphene was introduced as a conductive substrate or a backbone to support the diffusion of the electrolyte ions (OH ). In order to achieve the optimum electrochemical performance, graphene/AlV3O9 nanocomposites with different weight ratios were fabricated wherein G-5AlV possessed an exceptional charge storage ability which surpasses that of other nanocomposites. The G-5AlV sample was found to possess a magnificent spe...

  • Role of La3þ ion substitution sites on the photoluminescence.pdf.jpg
  • Article


  • Authors: Jyothi, G.; Gopchandran, K.G. (2020)

  • The consequence of the site selective substitution of La3þ ions in modifying the local crystal structure in red emitting titanate perovskites and the resulting enhancement of the luminescence properties were investigated in two distinct series of red phosphors of Sr1-x-yLaxTiO3:yEu3þ and Sr1-x/2-yLaxTi1-x/2O3:yEu3þ. Herein, the red emission line was found sharply magnified for the substitutions at the Sr2þ sites whereas broad peaks resembling the emission from the La2O3:Eu3þ red phosphor were detected for the substitution at both Sr2þ and Ti4þ sites, in the experiment of altering substitution sites of the La3þ ions in Sr1- xTiO3:xEu3þ. The local asymmetry induced by the substitution ...

  • Phytochemical mediated synthesis of.pdf.jpg
  • Article


  • Authors: Vasudevan, Prathibha; Vidyadharan, Viji; Simon, Sanu Mathew; V, Unnikrishnan N. (2020)

  • In the present work, ZnO:Dy3þ nanophosphors were synthesized by a simple, cost effective and ecofriendly route using the aqueous extract of Azadirachta Indica leaves. The prepared ZnO:Dy3þ nanophosphors were characterized using X-ray diffraction (XRD), Fourier Transformed Infra-Red (FTIR), Raman, UV-VIS diffuse reflectance (UVDR) spectroscopy and Photoluminescence (PL), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDX). TEM and X-ray diffraction analyses reveal the hexagonal wurtzite structure of the ZnO nanoparticles in the prepared samples. UV-VIS-NIR spectrum of the ZnO:Dy3þ nanophosphor was analysed on the bas...

  • pH-responsive carboxylic cellulose acetate nanoparticles for.pdf.jpg
  • Article


  • Authors: Ho, Boon-Kui; Chin, Suk-Fun; Pang, Suh-Cem (2020)

  • In this study, pH responsive carboxylic cellulose acetate nanoparticles (CCA NPs) have been evaluated as drug nanocarriers for controlled release of drug. Herein, carboxylic cellulose acetate (CCA) was initially synthesized via oxidation of cellulose using a 2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO) as an oxidant and followed by the acetylation of carboxylic cellulose in the presence of iodine as a catalyst. CCA NPs were then obtained via the nanoprecipitation process and subsequent sonication. The obtained CCA NPs with a mean diameter of 96 nm were subsequently evaluated as drug delivery nanocarriers. Penicillin G as a model drug was loaded onto the CCA NPs via the adsorpti...

  • Phase segregation controlled semiconductor crystallization for organic.pdf.jpg
  • Article


  • Authors: Zhang, Ziyang; He, Zhengran; Bi, Sheng; Asare-Yeboah, Kyeiwaa (2020)

  • In this article, we provide an in-depth review of important works on phase segregation which occurs as a result of mixing organic semiconductors with polymeric additives. Throughout the discussion, the indispensable correlations among phase segregation, crystal growth, layer structure and film morphology are showcased using specific examples that mainly entail small-molecule organic semiconductors such as 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) and 2,8-difluoro-5,11- bis(triethylsilylethynyl)anthradithiophene (diF-TES-ADT). The various factors that impact the phase segregation are analyzed, which include surface energy, solvent choice, additive nature, and substr...

  • Performance analysis of HfO2InAlNAlNGaN HEMT with AlN buffer.pdf.jpg
  • Article


  • Authors: Murugapandiyan, P.; Mohanbabu, A.; Lakshmi, V. Rajya; Ramakrishnan, V.N.; Varghese, Arathy; Wasim, MOHD; Baskaran, S.; Kumar, R. Saravana; Janakiraman, V. (2020)

  • We present a performance enhancement evaluation of n þ doped graded InGaN drain/source regionbased HfO2/InAlN/AlN/GaN/AlN on SiC metal-oxide-semiconductor high electron mobility transistor (MOS-HEMTs) with a T-shaped gate. Impact on the device characteristics with the inclusion of a HfO2 surface passivation layer and an AlN buffer layer in the MOS-HEMT structure as a performance booster has been analyzed for the HEMT device with 30 nm gate length using Silvaco ATLAS TCAD. The proposed MOS-HEMT exhibits an outstanding performance, with an enhanced power gain cut-off frequency (fmax) of 366 GHz, a current gain cut-off frequency (ft) of 426 GHz, and a off-state breakdown voltage (Vbr) o...

  • Oxide charge evolution under crystallization of amorphous LieNbeO.pdf.jpg
  • Article


  • Authors: Sumets, M.; Ievlev, V.; Belonogov, E.; Dybov, V.; Serikov, D.; Kotov, G.; Turygin, A. (2020)

  • LieNbeO amorphous films were deposited onto Si substrates by the radio-frequency magnetron sputtering method in an Ar environment and an Ar(60%)þO2(40%) gas mixture. A positive effective fixed oxide charge Qeff having negative, -Qeff, and positive, þQeff, components, exists in the as-grown heterostructures. -Qeff is located near the substrate/film interface, whereas þ Qeff is determined by a deficit of Li and O (vacancies) in the bulk of LieNbeO films. As-grown films crystallized under thermal annealing (TA) at temperatures up to 600 C and revealed the formation of polycrystalline LiNbO3. TA at about 520 C resulted in the formation of the second phase LiNb3O8, increasing þ Qef...

  • Oxidation-controlled magnetism and Verwey transition in.pdf.jpg
  • Article


  • Authors: Do, Hung Manh; Le, Thi Hong; Nguyen, Xuan Phuc; Pham, Hong Nam; Ngo, Thi Hong; Nguyen, Trung Hieu; Pham, Thanh Phong; Phan, Manh Huong; Kovac, Jozef; Skorvanek, Ivan (2020)

  • The structural and magnetic properties of Fe/Fe3O4 nanocomposites, synthesized by combined high energy ball milling and controlled oxidation, have been studied. An X-ray diffraction analysis of the crystal structure of the nanocomposites confirmed the coexistence of Fe and Fe3O4 phases. An increase of the oxygen concentration during oxidation process led to the formation of a higher fraction of the Fe3O4 phase with good crystallinity and stoichiometry. The morphology of the nanocomposites revealed a lamella-like structure with a thickness of about 30 nm. The saturation magnetization decreased when the phase fraction of Fe3O4 increased. The coercivity was enhanced at low temperat...

  • Magnetic interactions and spin-wave stiffness constant of.pdf.jpg
  • Article


  • Authors: Huong, Vu Thi Hoai; Nguyet, Dao Thi Thuy; Duong, Nguyen Phuc; Loan, To Thanh; Soontaranon, Siriwat; Anh, Le Duc (2020)

  • Indium-substituted yttrium iron garnet samples, Y3Fe5 xInxO12 (x ¼ 0e0.7, step 0.1), were prepared using a citrate solgel method. Synchrotron X-ray diffraction (SXRD) measurements combined with the Rietveld refinement technique were used to investigate the crystallization, structure parameters and lattice distortion in the samples. Magnetization and Curie temperature of the samples were measured with the SQUID and VSM equipments. The non-magnetic indium ions were found to reside at the octahedral sites, leading to an increase of the total magnetization and a decrease in the Curie temperature. Molecular field coefficients Naa, Ndd and Nad were determined by fitting the experimental the...

  • Low operating voltage resistive random access memory based on.pdf.jpg
  • Article


  • Authors: Ngo, Huu Thoai; Nguyen, Minh Trang Thi; Do, Dinh Phuc; Tran, Kim My; Ta, Kieu Hanh Thi; Phan, Bach Thang; Pham, Kim Ngoc (2020)

  • A high-performance non-volatile memory with low power consumption for long battery life and for large data storage is one of the key requirements of the wearable and other electronic Internet of Things (IoT) devices. In this study, we have fabricated and investigated the resistive switching behavior of an RRAM device using the nanocomposite of polyvinyl alcohol (PVA) and graphene oxide (GO) as the switching layer in a hybrid Ag/PVAeGO/FTO structure. The resistive switching behavior of the hybrid Ag/PVAeGO/ FTO device depends on the GO amount in the PVAeGO matrix. The optical analysis depicts the good interaction through the hydrogen bonds between the hydroxyl group (eOH) of PVA and C...

  • Fabrication of co-cultured tissue constructs using a dual cell seeding.pdf.jpg
  • Article


  • Authors: Ameer, Jimna Mohamed; Venkatesan, Ramesh Babu; Damodaran, Vinod; V, Nishad K.; Arumugam, Sabareeswaran; Asari, Anil Kumar Pallickaveedu Rajan; Kasoju, Naresh (2020)

  • Tissue engineering is emerging as a modern medicine fascination towards the establishment of human tissue banks; yet, these approaches typically involve cultures of only one type of cell and, therefore, do not recapitulate the native tissue physiology in toto. Co-culture models, comprised of different cell types, can potentially create the next level of complexity. However, conventional approaches involving multiple cell types and cell culture inserts do have limitations. To this end, here we demonstrate a novel cell culture insert that allows the use of any custom-made scaffold, free-flow of fluids/gases, dual cell seeding on either sides of the insert, easy stacking of multiple inse...

  • Fabrication and characterization of green synthesized ZnO.pdf.jpg
  • Article


  • Authors: Shashanka, R.; Esgin, Halil; Yilmaz, Volkan Murat; Caglar, Yasemin (2020)

  • In the present study, we report on the synthesis of ZnO nanoparticles using Tilia Tomentosa (Ihlamur) leaves extract followed by calcination at 400 C for 15 min. The prepared ZnO nanoparticles were characterized by XRD and SEM to study the phase and microstructure, respectively. The XRD analysis showed the absence of impurity peaks and the SEM image confirmed the spherical nature of the prepared ZnO nanoparticles with an average particle size of 80 nm. UV-Visible spectroscopy was used to study the optical properties, and the bandgap was calculated to be 3.55 eV. This large bandgap is attributed to the property of the semiconductor, which can be explored for solar cell applications. ...

  • Effect of hydrothermal temperature treatment on the variance of.pdf.jpg
  • Article


  • Authors: Mani, Rajaboopathi; Gupta, Santosh Kumar (2020)

  • Investigations of structural defects and their associated impact on the optical properties of optical materials are essential expediencies because different methods are involved in the preparation of those materials for display applications. Lanthanide ion doping is a simple structural probing strategy that facilitates the challenges of identifying the structural defects. Pure and terbium (Tb3þ) doped Ca2SiO4 (C2S) particles were prepared using Pechini (C2SP) and hydrothermal methods (C2SH). From SEM images, it is observed that the Tb3þ doped C2SP particles were highly agglomerated, more than the C2SH particles. The TEM study confirmed that the particle size decreased for C2SH prepa...

  • Balance between the explored Pt counter electrode in an electrolyte.pdf.jpg
  • Article


  • Authors: Dang, Hai-Linh Thi; Dao, Van-Duong; Vu, Ngoc Hung; Quang, Dang Viet; Vu, Hong Ha Thi; Nguyen, Thi Hanh; Mohamed, Ibrahim M.A.; Hoang, Xuan-Co; Vu, Doan Anh; Tuan, Pham Anh (2020)

  • This work investigates the effect of the ratio of the explored Pt area in the electrolyte medium and the photoanode area (REP) on the performance of dye-sensitized solar cells (DSCs). It is found that the power conversion efficiency of DSCs increases by the ascending REP. The highest power conversion efficiency, which was obtained for the cell with the REP of 64/49, was 8.40%. Furthermore, a relationship between the efficiency and fabrication cost is analyzed in terms of reducing or enhancing the surface area of CE compared to the photoanode's surface area. These findings may provide a way for the development of efficient and large-scale DSCs.

  • A controlled process of atomic-scale material design via temperaturemediated grain refinement of NiCo2O4 rods for capacitive energy.pdf.jpg
  • Article


  • Authors: Padya, Balaji; Enaganti, P.K.; Kali, Ravi; Ravikiran, N.; Narasaiah, N.; Jain, P.K. (2020)

  • We report on a controlled process of atomic-scale material design based on calcination-temperatureinduced structural variation and its influence on capacitive energy storage characteristics of spinelstructured NiCo2O4 rods (NCOR). Precisely, morphology-tuned NCOR were grown through a facile solvothermal process followed by a controlled calcination. The meticulous thermal-kinetics study revealed that the activation energy of 269.53 kJ/mol could transform the hydroxides into oxides completely. The precipitate was annealed at variable temperatures (350, 450 and 550 C) to incorporate structural changes with variation in size of the crystallites. NCOR-450 consisting of fine-sized nanocrys...

  • BacHoGoiAyLaMuaXuan_HaMinhHong_TranThuan.pdf.jpg
  • Book


  • Authors: Hà, Minh Hồng ; Trần, Thuận (2015)

  • Cuốn sách tập hợp và giới thiệu những bài thơ, những lá thư chúc Tết được Bác viết trong thời kì Người hoạt động cách mạng từ 1930 đến 1969 gửi chiến sĩ và đồng bào cả nước nhằm cổ vũ, động viên, kêu gọi nhân dân vững bước tiến lên trong công cuộc đấu tranh cách mạng, trong lao động và sáng tạo

  • Utility-of-copper-oxide-nanoparticles--CuO-NPs--as-eff_2020_Journal-of-Scien.pdf.jpg
  • Article


  • Authors: Siddiqui, Hafsa; Parra, Mohammad Ramzan; Pandey, Padmini; Qureshi, M.S.; Haque, Fozia Zia (2020)

  • In the present work, we have endeavored the utilization of wet-chemically synthesized copper oxide nanoparticles (CuO-NPs) as the active layer in hybrid bulk heterojunction (BHJ) solar cells. The BHJs with CuO-NPs display significantly different physics from customary BHJs, and prove a noteworthy improvement in their performance. It is noted that with the addition of CuO-NPs, the morphology of the photoactive layer endures significant changes. Incorporating CuO-NPs is an additional paradigm for BHJs solar cells which enhances the photocurrent density from 9.43 mA/cm2 to 11.32 mA/cm2 and the external quantum efficiency as well. Also the power-conversion efficiency (PCE) improved from 2...

  • Tungsten-oxide-modified-with-carbon-nanodots--Inte_2020_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: P, Smrithi S; Kottam, Nagaraju; V, Arpitha; Narula, Archna; N, Anilkumar G; V, Subramanian K R (2020)

  • We report for the first time the green synthesis of carbon nanodots (g-CDs) from the peels of T. cucumerina by simple hydrothermal route. An in-situ liquid phase process was adopted for the design of the monoclinic tungsten trioxide (m-WO3)- based nanostructure with g-CDs to obtain a bi-functionalg-CDs/m-WO3 system. Characterization techniques, such as X- Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microcsopy (FESEM), Energy Dispersion XRay Analysis (EDX), Fourier Transformed Infra-Red (FTIR), Ultra Violet Defuse Reflectance Spectroscopy (UV-DRS) and Photoluminescence Emission Spectroscopy (PLES) were employed for the morphological, ...

  • Simulation-of-coupling-optical-modes-in-1D-pho_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Le, Ngoc Duc; Nguyen-Tran, Thuat (2020)

  • In this paper, one-dimensional photonic crystal distributed feedback structures were chosen for simulating the photonic modes. The corresponding photonic bands were calculated by using a numerical method for solving the master equation, while the reflectivity spectra of the structures were simulated by using a rigorous coupled wave analysis method. By observing the variation of the photonic band diagram and the reflectivity spectrum versus different geometrical parameters, the variation of the photonic bands was detailedly studied. We observed two kinds of photonic modes: (i) the one related to the vertical structures, and (ii) the other related to the horizontal periodic structures. ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 311

Advanced Materials and Devices : [311]

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 311
  • Three-dimensional lion's mane like AlV3O9 deposited on graphene.pdf.jpg
  • Article


  • Authors: Low, Wei Hau; Lim, Siew Shee; Chia, Chin Hua; Siong, Chiu Wee; Khiew, Poi Sim (2020)

  • 3D lion's mane like AlV3O9 microspheres deposited on the well-exfoliated graphene were successfully synthesised through a facile solvothermal method where the graphene sheet was prepared solely via the liquid phase exfoliation process. The highly electrical conductive graphene was introduced as a conductive substrate or a backbone to support the diffusion of the electrolyte ions (OH ). In order to achieve the optimum electrochemical performance, graphene/AlV3O9 nanocomposites with different weight ratios were fabricated wherein G-5AlV possessed an exceptional charge storage ability which surpasses that of other nanocomposites. The G-5AlV sample was found to possess a magnificent spe...

  • Role of La3þ ion substitution sites on the photoluminescence.pdf.jpg
  • Article


  • Authors: Jyothi, G.; Gopchandran, K.G. (2020)

  • The consequence of the site selective substitution of La3þ ions in modifying the local crystal structure in red emitting titanate perovskites and the resulting enhancement of the luminescence properties were investigated in two distinct series of red phosphors of Sr1-x-yLaxTiO3:yEu3þ and Sr1-x/2-yLaxTi1-x/2O3:yEu3þ. Herein, the red emission line was found sharply magnified for the substitutions at the Sr2þ sites whereas broad peaks resembling the emission from the La2O3:Eu3þ red phosphor were detected for the substitution at both Sr2þ and Ti4þ sites, in the experiment of altering substitution sites of the La3þ ions in Sr1- xTiO3:xEu3þ. The local asymmetry induced by the substitution ...

  • Phytochemical mediated synthesis of.pdf.jpg
  • Article


  • Authors: Vasudevan, Prathibha; Vidyadharan, Viji; Simon, Sanu Mathew; V, Unnikrishnan N. (2020)

  • In the present work, ZnO:Dy3þ nanophosphors were synthesized by a simple, cost effective and ecofriendly route using the aqueous extract of Azadirachta Indica leaves. The prepared ZnO:Dy3þ nanophosphors were characterized using X-ray diffraction (XRD), Fourier Transformed Infra-Red (FTIR), Raman, UV-VIS diffuse reflectance (UVDR) spectroscopy and Photoluminescence (PL), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDX). TEM and X-ray diffraction analyses reveal the hexagonal wurtzite structure of the ZnO nanoparticles in the prepared samples. UV-VIS-NIR spectrum of the ZnO:Dy3þ nanophosphor was analysed on the bas...

  • pH-responsive carboxylic cellulose acetate nanoparticles for.pdf.jpg
  • Article


  • Authors: Ho, Boon-Kui; Chin, Suk-Fun; Pang, Suh-Cem (2020)

  • In this study, pH responsive carboxylic cellulose acetate nanoparticles (CCA NPs) have been evaluated as drug nanocarriers for controlled release of drug. Herein, carboxylic cellulose acetate (CCA) was initially synthesized via oxidation of cellulose using a 2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl (TEMPO) as an oxidant and followed by the acetylation of carboxylic cellulose in the presence of iodine as a catalyst. CCA NPs were then obtained via the nanoprecipitation process and subsequent sonication. The obtained CCA NPs with a mean diameter of 96 nm were subsequently evaluated as drug delivery nanocarriers. Penicillin G as a model drug was loaded onto the CCA NPs via the adsorpti...

  • Phase segregation controlled semiconductor crystallization for organic.pdf.jpg
  • Article


  • Authors: Zhang, Ziyang; He, Zhengran; Bi, Sheng; Asare-Yeboah, Kyeiwaa (2020)

  • In this article, we provide an in-depth review of important works on phase segregation which occurs as a result of mixing organic semiconductors with polymeric additives. Throughout the discussion, the indispensable correlations among phase segregation, crystal growth, layer structure and film morphology are showcased using specific examples that mainly entail small-molecule organic semiconductors such as 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) and 2,8-difluoro-5,11- bis(triethylsilylethynyl)anthradithiophene (diF-TES-ADT). The various factors that impact the phase segregation are analyzed, which include surface energy, solvent choice, additive nature, and substr...

  • Performance analysis of HfO2InAlNAlNGaN HEMT with AlN buffer.pdf.jpg
  • Article


  • Authors: Murugapandiyan, P.; Mohanbabu, A.; Lakshmi, V. Rajya; Ramakrishnan, V.N.; Varghese, Arathy; Wasim, MOHD; Baskaran, S.; Kumar, R. Saravana; Janakiraman, V. (2020)

  • We present a performance enhancement evaluation of n þ doped graded InGaN drain/source regionbased HfO2/InAlN/AlN/GaN/AlN on SiC metal-oxide-semiconductor high electron mobility transistor (MOS-HEMTs) with a T-shaped gate. Impact on the device characteristics with the inclusion of a HfO2 surface passivation layer and an AlN buffer layer in the MOS-HEMT structure as a performance booster has been analyzed for the HEMT device with 30 nm gate length using Silvaco ATLAS TCAD. The proposed MOS-HEMT exhibits an outstanding performance, with an enhanced power gain cut-off frequency (fmax) of 366 GHz, a current gain cut-off frequency (ft) of 426 GHz, and a off-state breakdown voltage (Vbr) o...

  • Oxide charge evolution under crystallization of amorphous LieNbeO.pdf.jpg
  • Article


  • Authors: Sumets, M.; Ievlev, V.; Belonogov, E.; Dybov, V.; Serikov, D.; Kotov, G.; Turygin, A. (2020)

  • LieNbeO amorphous films were deposited onto Si substrates by the radio-frequency magnetron sputtering method in an Ar environment and an Ar(60%)þO2(40%) gas mixture. A positive effective fixed oxide charge Qeff having negative, -Qeff, and positive, þQeff, components, exists in the as-grown heterostructures. -Qeff is located near the substrate/film interface, whereas þ Qeff is determined by a deficit of Li and O (vacancies) in the bulk of LieNbeO films. As-grown films crystallized under thermal annealing (TA) at temperatures up to 600 C and revealed the formation of polycrystalline LiNbO3. TA at about 520 C resulted in the formation of the second phase LiNb3O8, increasing þ Qef...

  • Oxidation-controlled magnetism and Verwey transition in.pdf.jpg
  • Article


  • Authors: Do, Hung Manh; Le, Thi Hong; Nguyen, Xuan Phuc; Pham, Hong Nam; Ngo, Thi Hong; Nguyen, Trung Hieu; Pham, Thanh Phong; Phan, Manh Huong; Kovac, Jozef; Skorvanek, Ivan (2020)

  • The structural and magnetic properties of Fe/Fe3O4 nanocomposites, synthesized by combined high energy ball milling and controlled oxidation, have been studied. An X-ray diffraction analysis of the crystal structure of the nanocomposites confirmed the coexistence of Fe and Fe3O4 phases. An increase of the oxygen concentration during oxidation process led to the formation of a higher fraction of the Fe3O4 phase with good crystallinity and stoichiometry. The morphology of the nanocomposites revealed a lamella-like structure with a thickness of about 30 nm. The saturation magnetization decreased when the phase fraction of Fe3O4 increased. The coercivity was enhanced at low temperat...

  • Magnetic interactions and spin-wave stiffness constant of.pdf.jpg
  • Article


  • Authors: Huong, Vu Thi Hoai; Nguyet, Dao Thi Thuy; Duong, Nguyen Phuc; Loan, To Thanh; Soontaranon, Siriwat; Anh, Le Duc (2020)

  • Indium-substituted yttrium iron garnet samples, Y3Fe5 xInxO12 (x ¼ 0e0.7, step 0.1), were prepared using a citrate solgel method. Synchrotron X-ray diffraction (SXRD) measurements combined with the Rietveld refinement technique were used to investigate the crystallization, structure parameters and lattice distortion in the samples. Magnetization and Curie temperature of the samples were measured with the SQUID and VSM equipments. The non-magnetic indium ions were found to reside at the octahedral sites, leading to an increase of the total magnetization and a decrease in the Curie temperature. Molecular field coefficients Naa, Ndd and Nad were determined by fitting the experimental the...

  • Low operating voltage resistive random access memory based on.pdf.jpg
  • Article


  • Authors: Ngo, Huu Thoai; Nguyen, Minh Trang Thi; Do, Dinh Phuc; Tran, Kim My; Ta, Kieu Hanh Thi; Phan, Bach Thang; Pham, Kim Ngoc (2020)

  • A high-performance non-volatile memory with low power consumption for long battery life and for large data storage is one of the key requirements of the wearable and other electronic Internet of Things (IoT) devices. In this study, we have fabricated and investigated the resistive switching behavior of an RRAM device using the nanocomposite of polyvinyl alcohol (PVA) and graphene oxide (GO) as the switching layer in a hybrid Ag/PVAeGO/FTO structure. The resistive switching behavior of the hybrid Ag/PVAeGO/ FTO device depends on the GO amount in the PVAeGO matrix. The optical analysis depicts the good interaction through the hydrogen bonds between the hydroxyl group (eOH) of PVA and C...

  • Fabrication of co-cultured tissue constructs using a dual cell seeding.pdf.jpg
  • Article


  • Authors: Ameer, Jimna Mohamed; Venkatesan, Ramesh Babu; Damodaran, Vinod; V, Nishad K.; Arumugam, Sabareeswaran; Asari, Anil Kumar Pallickaveedu Rajan; Kasoju, Naresh (2020)

  • Tissue engineering is emerging as a modern medicine fascination towards the establishment of human tissue banks; yet, these approaches typically involve cultures of only one type of cell and, therefore, do not recapitulate the native tissue physiology in toto. Co-culture models, comprised of different cell types, can potentially create the next level of complexity. However, conventional approaches involving multiple cell types and cell culture inserts do have limitations. To this end, here we demonstrate a novel cell culture insert that allows the use of any custom-made scaffold, free-flow of fluids/gases, dual cell seeding on either sides of the insert, easy stacking of multiple inse...

  • Fabrication and characterization of green synthesized ZnO.pdf.jpg
  • Article


  • Authors: Shashanka, R.; Esgin, Halil; Yilmaz, Volkan Murat; Caglar, Yasemin (2020)

  • In the present study, we report on the synthesis of ZnO nanoparticles using Tilia Tomentosa (Ihlamur) leaves extract followed by calcination at 400 C for 15 min. The prepared ZnO nanoparticles were characterized by XRD and SEM to study the phase and microstructure, respectively. The XRD analysis showed the absence of impurity peaks and the SEM image confirmed the spherical nature of the prepared ZnO nanoparticles with an average particle size of 80 nm. UV-Visible spectroscopy was used to study the optical properties, and the bandgap was calculated to be 3.55 eV. This large bandgap is attributed to the property of the semiconductor, which can be explored for solar cell applications. ...

  • Effect of hydrothermal temperature treatment on the variance of.pdf.jpg
  • Article


  • Authors: Mani, Rajaboopathi; Gupta, Santosh Kumar (2020)

  • Investigations of structural defects and their associated impact on the optical properties of optical materials are essential expediencies because different methods are involved in the preparation of those materials for display applications. Lanthanide ion doping is a simple structural probing strategy that facilitates the challenges of identifying the structural defects. Pure and terbium (Tb3þ) doped Ca2SiO4 (C2S) particles were prepared using Pechini (C2SP) and hydrothermal methods (C2SH). From SEM images, it is observed that the Tb3þ doped C2SP particles were highly agglomerated, more than the C2SH particles. The TEM study confirmed that the particle size decreased for C2SH prepa...

  • Balance between the explored Pt counter electrode in an electrolyte.pdf.jpg
  • Article


  • Authors: Dang, Hai-Linh Thi; Dao, Van-Duong; Vu, Ngoc Hung; Quang, Dang Viet; Vu, Hong Ha Thi; Nguyen, Thi Hanh; Mohamed, Ibrahim M.A.; Hoang, Xuan-Co; Vu, Doan Anh; Tuan, Pham Anh (2020)

  • This work investigates the effect of the ratio of the explored Pt area in the electrolyte medium and the photoanode area (REP) on the performance of dye-sensitized solar cells (DSCs). It is found that the power conversion efficiency of DSCs increases by the ascending REP. The highest power conversion efficiency, which was obtained for the cell with the REP of 64/49, was 8.40%. Furthermore, a relationship between the efficiency and fabrication cost is analyzed in terms of reducing or enhancing the surface area of CE compared to the photoanode's surface area. These findings may provide a way for the development of efficient and large-scale DSCs.

  • A controlled process of atomic-scale material design via temperaturemediated grain refinement of NiCo2O4 rods for capacitive energy.pdf.jpg
  • Article


  • Authors: Padya, Balaji; Enaganti, P.K.; Kali, Ravi; Ravikiran, N.; Narasaiah, N.; Jain, P.K. (2020)

  • We report on a controlled process of atomic-scale material design based on calcination-temperatureinduced structural variation and its influence on capacitive energy storage characteristics of spinelstructured NiCo2O4 rods (NCOR). Precisely, morphology-tuned NCOR were grown through a facile solvothermal process followed by a controlled calcination. The meticulous thermal-kinetics study revealed that the activation energy of 269.53 kJ/mol could transform the hydroxides into oxides completely. The precipitate was annealed at variable temperatures (350, 450 and 550 C) to incorporate structural changes with variation in size of the crystallites. NCOR-450 consisting of fine-sized nanocrys...

  • BacHoGoiAyLaMuaXuan_HaMinhHong_TranThuan.pdf.jpg
  • Book


  • Authors: Hà, Minh Hồng ; Trần, Thuận (2015)

  • Cuốn sách tập hợp và giới thiệu những bài thơ, những lá thư chúc Tết được Bác viết trong thời kì Người hoạt động cách mạng từ 1930 đến 1969 gửi chiến sĩ và đồng bào cả nước nhằm cổ vũ, động viên, kêu gọi nhân dân vững bước tiến lên trong công cuộc đấu tranh cách mạng, trong lao động và sáng tạo

  • Utility-of-copper-oxide-nanoparticles--CuO-NPs--as-eff_2020_Journal-of-Scien.pdf.jpg
  • Article


  • Authors: Siddiqui, Hafsa; Parra, Mohammad Ramzan; Pandey, Padmini; Qureshi, M.S.; Haque, Fozia Zia (2020)

  • In the present work, we have endeavored the utilization of wet-chemically synthesized copper oxide nanoparticles (CuO-NPs) as the active layer in hybrid bulk heterojunction (BHJ) solar cells. The BHJs with CuO-NPs display significantly different physics from customary BHJs, and prove a noteworthy improvement in their performance. It is noted that with the addition of CuO-NPs, the morphology of the photoactive layer endures significant changes. Incorporating CuO-NPs is an additional paradigm for BHJs solar cells which enhances the photocurrent density from 9.43 mA/cm2 to 11.32 mA/cm2 and the external quantum efficiency as well. Also the power-conversion efficiency (PCE) improved from 2...

  • Tungsten-oxide-modified-with-carbon-nanodots--Inte_2020_Journal-of-Science--.pdf.jpg
  • Article


  • Authors: P, Smrithi S; Kottam, Nagaraju; V, Arpitha; Narula, Archna; N, Anilkumar G; V, Subramanian K R (2020)

  • We report for the first time the green synthesis of carbon nanodots (g-CDs) from the peels of T. cucumerina by simple hydrothermal route. An in-situ liquid phase process was adopted for the design of the monoclinic tungsten trioxide (m-WO3)- based nanostructure with g-CDs to obtain a bi-functionalg-CDs/m-WO3 system. Characterization techniques, such as X- Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microcsopy (FESEM), Energy Dispersion XRay Analysis (EDX), Fourier Transformed Infra-Red (FTIR), Ultra Violet Defuse Reflectance Spectroscopy (UV-DRS) and Photoluminescence Emission Spectroscopy (PLES) were employed for the morphological, ...

  • Simulation-of-coupling-optical-modes-in-1D-pho_2020_Journal-of-Science--Adva.pdf.jpg
  • Article


  • Authors: Le, Ngoc Duc; Nguyen-Tran, Thuat (2020)

  • In this paper, one-dimensional photonic crystal distributed feedback structures were chosen for simulating the photonic modes. The corresponding photonic bands were calculated by using a numerical method for solving the master equation, while the reflectivity spectra of the structures were simulated by using a rigorous coupled wave analysis method. By observing the variation of the photonic band diagram and the reflectivity spectrum versus different geometrical parameters, the variation of the photonic bands was detailedly studied. We observed two kinds of photonic modes: (i) the one related to the vertical structures, and (ii) the other related to the horizontal periodic structures. ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 311