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A Comparative Investigation on the Structural,Optical and Electrical Properties of SiO_2-Fe_3O_4 Core-Shell Nanostructures with Their Single Components

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Acta Metallurgica Sinica(English Letters) 2015年第11期28卷 1317-1325页

作者： Neena Bachan A.Asha W.jothi jeyarani D.Arun Kumar j.merline shyla Department of Physics Energy NanoTechnology Centre(ENTeC)Loyola Institute of Frontier Energy(LIFE)Loyola College Department of Physics Dhanalakshmi Srinivasan College of Engineering and Technology Department of Physics Shri Andal Alagar College of Engineering

The SiO2-Fe3O4 core-shell nanostructures were synthesized by sol-gel chemistry. The morphological features of the nanostructures were examined by field emission scanning electron microscopy which revealed the core-shell nature of the nanoparticles. X-ray diffraction studies evidenced the formation of SiO2-Fe3O4 core-shell nanostructures with high degree of homogeneity. The elemental composition of the SiO2-Fe3O4 core-shell nanostructures was determined by energy-dispersive X-ray spectroscopy analysis. Fourier transform infrared spectroscopy showed the Si-O-Fe stretching vibrations. On analysis of the optical properties with UV-Vis spectra and Tauc＇s plot, it was found that the band gap of SiO2-Fe3O4 core-shell nanostructures diminished to 1.5 eV. Investigation of the electrical properties of the core-shell nanostructures using field-dependent conductivity measurements presented a significant increase in photoconductivity as compared to those of its single components, thereby rendering them as promising candidates for application as photo- electrodes in dye-sensitized solar cells.

关键词： Nanostructures Sol-gel chemistry Optical properties X-ray diffraction Electricalproperties

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A Comparative Investigation of Dye-Sensitized Titanium Dioxide(TiO_2) Nanorods Grown on Indium Tin Oxide(ITO) Substrates by Direct and Seed-Mediated Hydrothermal Methods

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Acta Metallurgica Sinica(English Letters) 2016年第5期29卷 457-463页

作者： V.Chandrakala j.Annai joseph Steffy Neena Bachan W.jothi jeyarani Tenzin Tenkyong j.merline shyla Department of Physics Energy Nanotechnology Centre (ENTeC) Loyola Institute of Frontier Energy (LIFE)Loyola College

We report a comparative investigation of the characteristics of modified TiO2 nanorods grown on conducting indium tin oxide glass （/TO） substrates by two different hydrothermal methods： the direct method by which rutile TiOa nanorods were grown directly on plain ITO substrates and the seed-mediated one using which a thin film of anatase TiO2 seed layer was laid down by spin coating and annealing prior to the growth of TiO2 nanorods on it. Microstructural analysis of the samples using X-ray diffraction confirmed their rutile nature. The average crystallite size estimated using Scherrer＇s formula was found to fall in the range of 11-17 nm in both cases. Field emission scanning electron microscopy revealed the nanorod morphologies of a dandelion arrangement in the case of directly grown ones and a proper vertical orientation in the case of the seed-mediated method. UV-Vis spectroscopy analysis of both the samples exhibited redshifts with intense absorption of visible radiation, and the seed-mediated one was found to possess an increased bandgap. The transport nature of the samples was characterized by significant increase in both dark and photocurrents. The results show that the dark and photocurrent values of the directly grown TiO2 nanorods were greater than those of the seed-mediated ones by - seven and five folds, respectively, and therefore, it could serve as efficient photoelectrodes in dye-sensitized solar cells.

关键词： Dye-sensitized solar cells Hydrothermal Seed-mediated Photoconductivity Spin coating Safranine 0 dye Ti02 nanorods

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