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Data on Nanocrystals Described by Researchers at Oak Ridge National Laboratory [Faradaurate-940: Synthesis, Mass Spectrometry, Electron Microscopy,...

August 8, 2014



Data on Nanocrystals Described by Researchers at Oak Ridge National Laboratory [Faradaurate-940: Synthesis, Mass Spectrometry, Electron Microscopy, High-Energy X-ray Diffraction, and X-ray Scattering Study of AU(similar to 940 +/- ...]

By a News Reporter-Staff News Editor at Energy Weekly News -- Investigators discuss new findings in Nanocrystals. According to news reporting out of Oak Ridge, Tennessee, by VerticalNews editors, research stated, "Obtaining monodisperse nanocrystals and determining their composition to the atomic level and their atomic structure is highly desirable but is generally lacking. Here, we report the discovery and comprehensive characterization of a 2.9 nm plasmonic nanocrystal with a composition of Au-940 +/- 20(SCH2CH2Ph)(160 +/- 4), which is the largest mass spectrometrically characterized gold thiolate nanoparticle produced to date."

Our news journalists obtained a quote from the research from Oak Ridge National Laboratory, "The compositional assignment has been made using electrospray ionization and matrix-assisted laser desorption ionization mass spectrometry (MS). The MS results show an unprecedented size monodispersity, where the number of Au atoms varies by only 40 atoms (940 +/- 20). The mass spectrometrically determined composition and size are supported by aberration-corrected scanning transmission electron microscopy (STEM) and synchrotron-based methods such as atomic pair distribution function (PEW) and small-angle X-ray scattering (SAXS). Lower-resolution STEM images show an ensemble of particles-1000s per frame visually demonstrating monodispersity. Modeling of SAXS data on statistically significant nanoparticle population approximately 10(12) individual nanoparticles shows that the diameter is 3.0 +/- 0.2 nm, supporting mass spectrometry and electron microscopy results on monodispersity. Atomic PDF based on high-energy X-ray diffraction experiments shows decent match with either a Marks decahedral or truncated octahedral structure. Atomic resolution STEM images of single particles and their fast Fourier transform suggest face-centered cubic arrangement. UV-visible spectroscopy data show that Faradaurate-940 supports a surface plasmon resonance peak at similar to 505 nm."

According to the news editors, the research concluded: "These monodisperse plasmonic nanoparticles minimize averaging effects and have potential application in solar cells, nano-optical devices, catalysis, and drug delivery."

For more information on this research see: Faradaurate-940: Synthesis, Mass Spectrometry, Electron Microscopy, High-Energy X-ray Diffraction, and X-ray Scattering Study of AU(similar to 940 +/- 20)(SR)(similar to 160 +/- 4) Nanocrystals. ACS Nano, 2014;8(6):6431-6439. ACS Nano can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Nano - www.pubs.acs.org/journal/ancac3)

Our news journalists report that additional information may be obtained by contacting C. Kumara, Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831, United States. Additional authors for this research include X.B. Zuo, D.A. Cullen and A. Dass.

Keywords for this news article include: Oak Ridge, Tennessee, Nanoparticle, United States, Nanotechnology, Emerging Technologies, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Energy Weekly News


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