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Authors: Chu, Tien Dung; Nguyen, Quang Loc; Phi, Thi Huong; Dinh, Thi Thuy Duong; Tran, Thi Hong; Luu, Manh Quynh; Nguyen, Hoang Nam (2014) - 4-Aminothiophenol (4-ATP) functionalized silver nanoparticles and magnetic Fe3O4 nanoparticles were combined in a bi-functional nanocolloids which were covered by an approximately 5nm SiO2 layer by inverse emulsion method in order to apply to biomedicine. High saturated magnetization Ms indicated that the colloids are easy to be controlled by external magnetic field, while the characteristic Surface Enhanced Raman peak positions of 4-ATP absorbed on the metal particles were occurred without any alterations, which significantly predicted attractive applicability of the colloids for biomedical labeling.
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Authors: Do, Quang Ngoc; Hoang, Thi Nu; Luu, Van Thiem; Luu, Manh Quynh; Le, Tuan Tu (2017) - The magnetic properties in CoNiP/Au multisegments nanowire were investigated. All the samples were prepared by electrodeposition method with pH of 5.5 and room temperature. The electrochemical potential of CoNiP was determined by cycle voltammetary. The crystalline structure and morphology of the samples were characterized by X-ray diffraction (XRD), Scanning Electron Miroscopy (SEM) and High-resolution transmission electron microscopy (HRTEM), respectively. The hysteresis loops were measured at room temperature using vibrating sample magnetometry (VSM). The SEM and TEM image showed that the CoNiP/Au nanowires with diameters about 50 nm. The lattice spacing of the CoNiP samples were ...
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Authors: Luu, Manh Quynh; Nguyen, Minh Hieu; Nguyen, Hoang Nam (2015) - In this study, the fast DNA diagnostics was successfully developed using high fluorescent Mn doped ZnS nanoparticles and NH2-modified SiO2 coated Fe3O4 nanoparticles in a sandwich structure. In one end of the sandwich structure, we employed NH2-modified SiO2 coated Fe3O4 nanoparticles as a docking matrix. A so-called capture probe oligonucleotide chain, that specifically identifies the target DNA, linked to the docking magnetic particles. In the other end, other oligonucleotide chain – named detector probe – contacted with the signaling semiconductor particles. The complementary hybridization of the detector probe – target – capture probe formed the sandwich configuration that attache...
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Authors: Sai, Cong Doanh; Luu, Manh Quynh (2015) - In recent years, glucose oxidase (GOx) based sugar level detecting techniques have been intensively developed. In order to improve the diagnosis and desease treatment in low- and middle-income countries, the low cost, easily processing, but still high sensitive sensing systems/equipments play a very important rules in biomedicine and life science. In this work, lead sulfide (PbS) nanocolloids were used as electron receptor. The results showed that the sensitivity of the glucose sensor reached 546.2 μA cm-2 mM-1. It is note that, some early works on GOx based glucose sensor only reached sensitivity less than 100 μA cm-2 mM-1.
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Authors: Luu, Manh Quynh; Hoang, Van Huy; Nguyen, Hoang Nam (2015) - Mn-doped ZnS (ZnS/Mn) nanoparticles synthesized by sono-chemical co-precipitation are combined with ZnO nanoparticles synthesized by sol-gel method for application in two-barcode encryption. Nanoparticles are mixed together in different mass proportions of ZnO: ZnS/Mn respectively being 5: 1, 10: 1, 15: 1, 20: 1, 25: 1.30 : 1 and 35: 1, before being pressed in 1 cm diameter, 1 mm thick KBr pellets. The photoluminescence (PL) of the tablet shows that the mass proportion of two materials could be distinghuished by the proportion of the PL intensities at 515 nm and 600 nm, which promises potential manufacturing ability two-substant/two-barcode information storage systems for civil securi...
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Authors: Tran, Quoc Tuan; Pham, Van Hao; Luu, Manh Quynh; Nguyen, Hoang Luong; Nguyen, Hoang Hai (2015) - Silver nanoparticles colloid has been prepared by heat-combined electrochemical method, which uses simple and low-cost equipment of easy installation and operation, is easily deployed in industrial scale. A silver plate was used as the cathode instead of silver salts to avoid unexpected ions from the salts. The cathode was made from a stainless steel plate. The chemical used as the electrolyte solution is TriSodium Citrate (TSC). Silver nanoparticles made by the above method are spherical, small-sized, its size distribution ranges from 3-12nm, stably dispersing in a non-toxic solution.
Bactericidal capacity of silver nanoparticles are tested on 4 types of common bacteria and fungi....
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Authors: Luu, Manh Quynh; Nguyen, Thi Tra My; Bui, Thi Hong Nhung; Nguyen, Hoang Nam (2016) - ZnS quantum dots (QDs) are prepared by ultrasonic-assisted chemical precipitation method with the presence of different concentration Trisodium citrate (TSC). The TSC molecules play very important role in inhibiting the growth of the ZnS particles. The mean size of the ZnS crystals which is estimated from the X-ray diffractions decreases from 1.7 nm to 1.4 nm when the added amount of the TSC increases. The lattice constant of the particles decreases from 5.40 Å to 5.38 Å and the band gap of the material increases from 3.92 eV to 4.74 eV. The particles are well dispersive in aqueous solution and emit blue light at around 430 nm while being excited by 320 nm ultraviolet light, which gu...
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Authors: Nguyen, Hoang Luong; Nguyen, Ngoc Long; Le, Van Vu; Nguyen, Hoang Hai; Luu, Manh Quynh (2009) - Sphere-like gold nanoparticles have been prepared by chemical reduction method and by using X-ray irradiation, while rod-like gold nanoparticles were synthesized according to the seed-mediated growth method and by sonoelectrochemistry. Sphere-like gold nanoparticles have diameter of 20 - 60 nm, while rod-like gold nanoparticles have aspect ratio from 2 to 4. In UV-vis spectra the absorption bands related to surface piasmon resonance were observed. CoPt nanoparticlcs with the size of 5 - 20 nm have been prepared by electrodeposition, while FePt Iianoparticles with the size of 5 - 10 nm were synthesized by sonoclectrodeposition. After annealing, these magnetic nanoparticles showed a hig...
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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.
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Authors: Chu, Tien Dung; Luu, Manh Quynh; Tran, Thi Hong; Nguyen, Hoang Nam (2017) - In this paper, Fe3O4-ZnO heterostructure multifunctional nanoparticles (NPs) were successfully prepared in aqueous solution by ultrasound assisted thermolysis. First, iron oxide (Fe3O4) magnetic NPs were prepared by co-precipitation method. The Fe3O4 NPs were modified by 3-aminopropyltriethoxysilane (APTES) to have free amine (-NH2) groups on their surface, then, Zn2+ ions were added and stirred to adsorb onto the surface of Fe3O4-NH2 NPs in alkaline solution at a pH of 11. This solution was decomposed through thermolysis in ultrasound bath. The results of measurements show that photoluminescence of Fe3O4-ZnO heterostructure multifunctional NPs was enhanced in visible light at 565 nm ...
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Authors: Luu, Manh Quynh; Nguyen, Thi Tien; Nguyen, Ba Loc; Vu, Quang Tho; Nguyen, Thi Lan; Pham, Van Thanh; Nguyen, Minh Hieu; Hoang, Ngoc Lam Huong; Nguyen, Hoang Luong (2017) - The proportional relationship between the infrared (IR) transmittance of a transparent material and its IR-induced heat transfer can be explained via a simple model. The agreement between theory and the experimental work was examined by measuring the temperature rising inside a heat-insulated box with glass windows under IR irradiation, where the material of the glass windows was modified from corning glass (CG) to 9 at% Nb-doped TiO2 (TNO) fabricated by sputtering deposition. The fabricated TNO thin film was mostly transparent in visible region and had low transparency in IR region, which produced the self-cooling effect inside the insulated box. In comparison to the window glass mad...
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