by Staff Writers
Chicago IL (SPX) May 24, 2017
Nanocrystals have diverse applications spanning biomedical imaging, light-emitting devices, and consumer electronics. Their unique optical properties result from the type of crystal from which they are composed. However, a major bottleneck in the development of nanocrystals, to date, is the need for X-ray techniques to determine the crystal type.
Researchers at the University of Illinois at Urbana-Champaign have developed a novel way to determine crystal type based on optics - by identifying the unique ways in which these crystals absorb light.
"This new ability eliminates the need for slow and expensive X-ray equipment, as well as the need for large quantities of materials that must be extensively purified," explained Andrew M.
Smith, an assistant professor of bioengineering and principle investigator for the project. "These theoretical and experimental insights provide simple and accurate analysis for liquid-dispersed nanomaterials that we think can improve the precision of nanocrystal engineering and also improve our understanding of nanocrystal reactions."
"The results are even more clear than with standard materials characterization methods," stated Sung Jun Lim, a postdoctoral fellow in Smith's research group and first author of the paper, "Optical Determination of Crystal Phase in Semiconductor Nanocrystals," appearing in Nature Communications.
"In this study, we identified optical signatures of cubic and hexagonal phases in II-VI nanocrystals using absorption spectroscopy and first-principles electronic-structure theory. We observed that high-energy spectral features allow rapid identification of phase, even in small nanocrystals around two nanometers in diameter, or just several hundred atoms."
According to Andre Schleife, an assistant professor of materials science and engineering and co-author of the study, the tight integration of accurate experimentation and cutting-edge theoretical spectroscopy realized in this work is a showcase for modern nanoscale research.
The optical crystallographic analysis technique that resulted from this collaboration provides a new and powerful ability to continuously measure phase during synthesis or processing in solution by absorption spectroscopy, which can be more simple, rapid, high-throughput, and potentially more accurate for structural characterization compared with solid phase X-ray techniques.
Stanford CA (SPX) May 24, 2017
A tiny amount of squeezing or stretching can produce a big boost in catalytic performance, according to a new study led by scientists at Stanford University and SLAC National Accelerator Laboratory. The discovery, published May 18 in Nature Communications, focuses on an industrial catalyst known as cerium oxide, or ceria, a spongy material commonly used in catalytic converters, self-cleani ... read more
University of Illinois College of Engineering
Nano Technology News From SpaceMart.com
Computer Chip Architecture, Technology and Manufacture
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|