By a News Reporter-Staff News Editor at Electronics Newsweekly -- Research findings on Nanocrystals are discussed in a new report. According to news reporting originating in Hefei, People's Republic of China, by VerticalNews journalists, research stated, "Tailored fabrication of nonstoichiometric semiconductor nanocrystals with tunable electronic structures has attracted considerable attention owing to their scientific and technological importance. In this work, we have developed a novel and facile approach to prepare stable Sn2+ self-doped SnO2-x nanocrystals with a large surface area via a synproportionation reaction of Sn4+ with metal tin under mild conditions."
The news reporters obtained a quote from the research from the China University of Science and Technology, "The effects of Sn2+ doping concentration in SnO2-x lattice on the nanoparticle size, band structure, and photodegradation of methyl orange (MO) were investigated in detail. It is found that the obtained deep-yellow colored Sn2+ self-doped SnO2-x sample shows exceptionally higher visible-light photocatalytic performance than stoichiometric SnO2, which is only sensitive to UV light due to its intrinsic large band gap. To the best of our knowledge, this is the first experimental example that self-doped metal oxide nanocrystals have been utilized as an effective photocatalyst for the degradation of pollutants within 15 min under visible-light irradiation (lambda >= 400 nm). The superior photodegradation activity of the Sn2+ self-doped SnO2. can be ascribed to the incorporation of Sn2+ into the lattice matrix and accompanying oxygen vacancies, which can result in significant narrowing of the band gap and enhancement in the visible-light absorption capability, notably, the efficient separation of the photogenerated electron hole pairs in SnO2-x., which has been further confirmed by remarkable enhancement of the photocurrent response. Moreover, strong photo-oxidation capability for high content center dot H radical formation over SnO2-x (ca. 25 times higher than SnO2 sample) also contributes to the improvement of photocatalytic performance."
According to the news reporters, the research concluded: "Our synthetic approach could be extended to design other nonstoichiometric semiconductor nanostructures with tunable band structure, highly efficient visible-light photocatalytic activity, and enhanced photoelectric conversion properties in the future."
For more information on this research see: Synproportionation Reaction for the Fabrication of Sn2+ Self-Doped SnO2-x Nanocrystals with Tunable Band Structure and Highly Efficient Visible Light Photocatalytic Activity. Journal of Physical Chemistry C, 2013;117(46):24157-24166. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)
Our news correspondents report that additional information may be obtained by contacting C.M. Fan, China University of Science & Technology, Div Nanomat & Chem, Hefei Natl Lab Phys Sci Microscale, Dept. of Chem, Hefei 230026, People's Republic of China. Additional authors for this research include Y. Peng, Q. Zhu, L. Lin, R.X. Wang and A.W. Xu.
Keywords for this news article include: Asia, Hefei, Electronics, Photocatalyst, Semiconductor, Nanotechnology, Photocatalytic, Emerging Technologies, People's Republic of China
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