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Effect of Annealing Temperature on Binary TiO2:SiO2 Nanocrystalline Thin Films
F. Mei,C. Liu,J. B. Wang,L. Zhou,W. K. Zhao,Y. L. Fang,Y. Y. Ren 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
Binary TiO2:SiO2 nanocrystalline thin films were prepared using liquid phase deposition at 35 C and annealed in air at temperatures ranging from 100 C to 500 C. The microstructural and the optical properties of the thin films were characterized by using an ultraviolet-visible spectrophotometer, a Fourier transform infrared spectrophotometer, a scanning electron microscope, and a transmission electron microscope. The photocatalytic performance of the thin films was evaluated by using photocatalytic degradation of methylene blue. The results showed that most TiO2 nanocrystallites were uniformly dispersed onto an amorphous SiO2 matrix and that nanopores had been formed on top of the TiO2 nanoparticles, resulting in an improved photocatalytic efficiency due to an increase number of effective adsorption sites. As we increased the annealing temperature, the small crystallites progressively aggregated into larger clusters, reducing the specific surface area of the TiO2 nanocrystallites. Moreover, SiO2 nanopowders moved towards the surface and covered the TiO2, resulting in a decreased photocatalytic activity.e
Hui, K.S.,Hui, K.N.,Dinh, D.A.,Tsang, C.H.,Cho, Y.R.,Zhou, W.,Hong, X.,Chun, H.H. Elsevier Science 2014 Acta materialia Vol.64 No.-
A green chemical approach to control the dimensions of Ag nanoparticle-decorated graphene oxide (AgNP-GO) composites was proposed by in situ ultrasonication of a mixture of AgNO<SUB>3</SUB> and GO solution with the assistance of vitamin C acting as an environmentally friendly reducing agent at room temperature. The AgNP-GO composites were characterized by X-ray diffraction, transmission electron microscopy, energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, Raman spectra and ultraviolet-visible absorption spectra. The results demonstrated that Ag nanoparticles with an average diameter of ~15nm were uniformly dispersed on the surface of GO nanosheets by in situ ultrasonication of 1min with vitamin C. Increasing the ultrasonication times resulted in Ag nanoparticles with tunable dimensions ranging from 15 to 55nm being formed on the surface of GO nanosheets. The amount of silver nitrate and the ultrasonication time play a key role in the control of the dimension of Ag nanoparticles on GO, and a formation mechanism of the as-prepared AgNP-GO composites is proposed. This study provides a guide to controlling the dimensions of AgNP-GO composites, which may hold promise as advanced materials for various analytical applications such as catalysis, sensors and microchips.
Hur, S.,Chung, J. W.,Zhou, C. G.,Lee, J. H.,Cho, S.,Kim, M.,Lee, M.,Kim, H. C.,Jae, H. J. Springer Science + Business Media 2017 European radiology Vol.27 No.4
<P>aEuro cent The existence of Sappey's superior artery was proved with a radiological method.</P>