A novel photochemical synthesis of colloidal gold particles has been studied based on a seed-mediated growth approach under the UV solar radiation on plateau. In the HAuCl4 solution containing certain amounts of protective agent and acetone, the colloidal gold particles with 5 nm (=0.86) in average diameter were prepared by UV 300 nm irradiation and used as seeds, their further growth then was carried out in the identical constituent solutions under the UV solar radiation. The results showed that to control the molar ratio of seed to Au(III) ion and use repetitive seeds can obtain different sized and surface-confined gold nanoparticles, and it is completely possible to utilize the UV solar radiation on the plateau with the higher elevation for the size-controlled synthesis of monodisperse gold nanoparticles under suitable conditions. The mechanism of the nucleation, growth and stabilization of gold particles were discussed in detail.
In this work, a high gain broadband photoconductor based on a wide bandgap amorphous gallium oxide film was reported. Meanwhile, a novel short-time heating method was demonstrated to effectively suppress the PPC effect.
In this study, a novel composite Ni-OTiO 2 was prepared by doping nickel and introducing excess oxygen defects in TiO 2 . The assynthesized Ni-OTiO 2 particles were characterized by scanning electron microscopy, X-ray diffractino, transmission electron microscopy, Fourier transform infrared spectroscopy, differential reflectance spectroscopy, photoluminescence, photoelectrochemistry, and X-ray photoelectron spectroscopy. When employing Ni (1%)-OTiO 2 as photocatalyst, the conversion of benzyl alcohol (BA) was up to 93% by 1 h irradiation derived from a 300 W xenon lamp, which is ∼8-times higher than that using pure TiO 2 . Moreover, while being irradiated with the 300 W xenon lamp (using a filter, λ > 420 nm), the Ni (1%)-OTiO 2 conducted photocatalytic system can give 86% conversion of BA to benzaldehyde within 1 h. Specifically, during photocatalysis, a peroxo group and nickel ion act as the electron carrier, promoting the separation of the electron−hole pair. It is considered that the highly improved photocatalytic ability after modification of pure TiO 2 is ascribable to the synergistic effect of excess oxygen defects and nickel doping in TiO 2 .
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