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Studies from University of California in the Area of Nanoparticles Reported

January 22, 2014

By a News Reporter-Staff News Editor at Biotech Week -- Research findings on Nanoparticles are discussed in a new report. According to news reporting originating from Santa Cruz, California, by NewsRx correspondents, research stated, "Much progress has been made in using hematite (-Fe2O3) as a potentially practical and sustainable material for applications such as solar-energy conversion and photoelectrochemical (PEC) water splitting; however, recent studies have shown that the performance can be limited by a very short charge-carrier diffusion length or exciton lifetime. In this study, we performed ultrafast studies on hematite nanoparticles of different shapes to determine the possible influence of particle shape on the exciton dynamics."

Our news editors obtained a quote from the research from the University of California, "Nanorice, multifaceted spheroidal nanoparticles, faceted nanocubes, and faceted nanorhombohedra were synthesized and characterized by using SEM and XRD techniques. Their exciton dynamics were investigated by using femtosecond transient absorption (TA) spectroscopy. Although the TA spectral features differ for the four samples studied, their decay profiles are similar, which can be fitted with time constants of 1-3ps, approximately 25ps, and a slow nanosecond component extending beyond the experimental time window that was measured (2ns). The results indicate that the overall exciton lifetime is weakly dependent on the shape of the hematite nanoparticles, even though the overall optical absorption and scattering are influenced by the particle shape."

According to the news editors, the research concluded: "This study suggests that other strategies need to be developed to increase the exciton lifetime or to lengthen the exciton diffusion length in hematite nanostructures."

For more information on this research see: Ultrafast Transient Absorption Studies of Hematite Nanoparticles: The Effect of Particle Shape on Exciton Dynamics. Chemsuschem, 2013;6(10):1907-1944. Chemsuschem can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell -; Chemsuschem -

The news editors report that additional information may be obtained by contacting B.C. Fitzmorris, University of California, Dept. of Chem & Biochem, Santa Cruz, CA 95064, United States. Additional authors for this research include J.M. Patete, J. Smith, X. Mascorro, S. Adams, S.S. Wong and J.Z. Zhang (see also Nanoparticles).

Keywords for this news article include: Santa Cruz, California, United States, Nanotechnology, Emerging Technologies, North and Central America

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Source: Biotech Week

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