By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Nanostructures. According to news reporting originating in Hong Kong, People's Republic of China, by NewsRx journalists, research stated, "A novel synthetic strategy has been adopted to deposit Au nanoparticles (NPs) (ca. 5 nm) on a hollow FeOx substrate using Au/beta-FeOOH hybrid nanocrystals as the precursor. Through the encapsulation of Au/beta-FeOOH by SiO2 shells and the calcination step, the Au/beta-FeOOH can be transformed into Au/FeOx with the hollow structural feature."
The news reporters obtained a quote from the research from Hong Kong Baptist University, "Because of the protective SiO2 shells, aggregation of the Au NPs is effectively prohibited, and the hemispherical morphology of the Au particles is essentially retained. The Au/FeOx hollow composite is obtained by removing the SiO2 shells, and the Au NPs in the final Au/FeOx hollow composite are small-sized yet stable enough because of the calcination history. The derived Au/FeOx hollow composite shows a substantial pretreatment effect on CO oxidation: with a pretreatment in the reaction feed at 180 degrees C for 0.5 h, the hollow Au/FeOx shows the T-100 of CO oxidation decreasing from 180 to 88 degrees C. O-2 temperature-programmed desorption and X-ray photoelectron spectroscopy characterizations revealed that the pretreatment may result in (i) the creation of electron holes in the p-type FeOx substrate and electron deficiency of Au nanoparticles as well as a strong Au-FeOx interaction; (ii) appropriate coverage of oxygen adspecies on the Au NPs; and (iii) increased surface oxygen density, especially at the Au-FeOx boundary region, as a result of the spillover effect of oxygen adspecies from Au NPs."
According to the news reporters, the research concluded: "All of these features are responsible for an overall enhanced activity of CO oxidation and better durability of the Au/FeOx hollow composite."
For more information on this research see: Substantial Pretreatment Effect on CO Oxidation over Controllably Synthesized Au/FeOx Hollow Nanostructures via Hybrid Au/beta-FeOOH@SiO2. ACS Catalysis, 2013;3(12):3099-3105. ACS Catalysis can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Catalysis - www.pubs.acs.org/journal/accacs)
Our news correspondents report that additional information may be obtained by contacting B. Sun, Hong Kong Baptist University, Dept. of Chem, Kowloon Tong, Hong Kong, People's Republic of China. Additional authors for this research include X.Z. Feng, Y. Yao, Q. Su, W.J. Ji and C.T. Au (see also Nanostructures).
Keywords for this news article include: Asia, Hong Kong, Chalcogens, Nanoparticle, Nanostructural, Nanostructures, Nanotechnology, Emerging Technologies, People's Republic of China
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