• Electrochromic properties of PANI/TiO₂ nanocomposite films prepared by electropolymerizationElectrochromic properties of PANI/TiO₂ nanocomposite films prepared by electropolymerization

    PANI/nc-TiO2/ITO composite films were prepared by electrochemical method where the monomer aniline was polymerized onto nano-porous TiO2/ITO films (PANI/nc-TiO2/ITO). The PANI/nc-TiO2 heterojunctions were formed in the composite films due to the insertion of PANI in nano-porous TiO2 particles. PANI/ITO films exhibited a reversible electrochromic...

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  • Photoluminescent properties of red-emitting AlPO4:Cr3+ phosphor for plant growth LEDsPhotoluminescent properties of red-emitting AlPO4:Cr3+ phosphor for plant growth LEDs

    In this study, red-emitting AlPO4:Cr3+ phosphors have been successfully synthesized by a facile sol-gel method. The Tanabe–Sugano diagram demonstrates that the surrounding sites of Cr3+ ions have a high crystal field with Dq/B=2.47. The sharp 694-nm peak on the PL of AlPO4:Cr3+ phosphor could be attributed to the 2E→4A2 electron transition of Cr...

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  • Facile hydrothermal method for fabrication of seedless ZnO composite on PCBFacile hydrothermal method for fabrication of seedless ZnO composite on PCB

    Herein we report on a simple method to grow ZnO nanorod/Graphene oxide (GO) array without the initial seed layer on a printed circuit board (PCB) as the substrate based on Galvanic effect. The hydrothermal growing conditions such as temperature and time were investigated by Xray diffractometry (XRD), Raman scattering, as well as Scanning Electron...

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  • Fabricating microsphere lasers by protein dehydration: A fast fabrication method and excellent lasing propertiesFabricating microsphere lasers by protein dehydration: A fast fabrication method and excellent lasing properties

    Microsphere biolasers have attracted a great deal of interest due to their potential in biosensing and cell-tracking. Various fabrication techniques have been explored for making microsphere biolasers, such as freeze-drying in a vacuum, standard oil in water dispersion procedure and protein dehydration in a solvent. The protein dehydration is hi...

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  • Evaluation of thick target PIXE analysis in the 5SDH-2 pelletron accelerator facility at VNU University of ScienceEvaluation of thick target PIXE analysis in the 5SDH-2 pelletron accelerator facility at VNU University of Science

    This paper presents the evaluation of the Thick Target Particle Induced X-rays Emission (TTPIXE) technique using standard samples. The element-dependent standardization factor, H, as a function of X-ray energies is calibrated using standard sample NIST-611 and validated with two standard samples: IAEA-Soil7 and NIES-Pepperbush. The obtained resu...

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  • Breakdown characteristics of composite insulation for high temperature superconducting cableBreakdown characteristics of composite insulation for high temperature superconducting cable

    Polypropylene laminated paper (PPLP) and Kraft paper have been studied as multi-layer insulation for high temperature superconducting cable. The experiment was conducted with AC and impulse voltages. Short-term and long-term breakdown of insulation samples were investigated. The experimental results show that the breakdown voltage becomes smalle...

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  • A simulation study of the amorphous germania structure up to 70 GPaA simulation study of the amorphous germania structure up to 70 GPa

    This work presents the effect of pressure on the local microstructure of amorphous Germania (GeO2). The Molecular Dynamics simulation was performed on systems at 900 K and high pressure up to 70 GPa. The structural properties have been analyzed through the pair correlation function, coordination number distribution, and structure factors. The st...

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  • Enhanced photocatalytic activity using near visible light of ZnO nanorods by doping with Mn²+ ionsEnhanced photocatalytic activity using near visible light of ZnO nanorods by doping with Mn²+ ions

    ZnO is a promising photocatalyst for photocatalytic oxidation of organic compounds under the influence of sunlight that provides clean energy and decomposes sustainable organic pollutants substances. ZnO is found to have non-toxic properties, long-term stability, high carrier mobility, low cost and biocompatibility. However, some disadvantages o...

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  • Effective couplings between two photons and axion in the 3-3-1 modelEffective couplings between two photons and axion in the 3-3-1 model

    The one-loop contribution axion-photon-photon coupling is presented in the framework of the 3-3-1 model, in which the loop diagrams are finite. The decay of axion into two photons is demonstrated. This study shows that it is easy to fulfill dark matter candidate conditions for the axion in the model.

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  • Ag-decorated TiO₂ nanofibers for surface-enhanced raman scatteringAg-decorated TiO₂ nanofibers for surface-enhanced raman scattering

    In this report, SERS substrates based on Ag-decorated TiO2 nanofibers electrospun on a glass substrate (Ag/TiO2/glass) were successfully prepared using electrospinning and photodeposition methods. XRD pattern demonstrated that the crystalline structure of TiO2 nanofibers (TiO2 NFs) consisted of both anatase and rutile phase. SEM images show that...

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