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Study Findings on Analytical Chemistry Are Outlined in Reports from Federal University

February 28, 2014

By a News Reporter-Staff News Editor at Energy Weekly News -- Research findings on Analytical Chemistry are discussed in a new report. According to news reporting out of Porto Alegre, Brazil, by VerticalNews editors, research stated, "We report the quantitative compositional profiling of 3-5 nm CdSe/ZnS quantum dots (QDs) conjugated with a perfluorooctanethiol (PFOT) layer using the newly developed time-of-flight (TOF) medium-energy ion scattering (MEIS) spectroscopy with single atomic layer resolution. The collection efficiency of TOF-MEIS is 3 orders of magnitude higher than that of conventional MEIS, enabling the analysis of nanostructured materials with minimized ion beam damage and without ion neutralization problems."

Our news journalists obtained a quote from the research from Federal University, "The spectra were analyzed using PowerMEIS ion scattering simulation software to allow a wide acceptance angle. Thus, the composition and core-shell structure of the CdSe cores and ZnS shells were determined with a 3% composition uncertainty and a 0.2-nm depth resolution. The number of conjugated PFOT molecules per QD was also quantified. The size and composition of the QDs were consistent with those obtained from high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy, respectively."

According to the news editors, the research concluded: "We suggest TOF-MEIS as a nanoanalysis technique to successfully elucidate the core-shell and conjugated layer structures of QDs, which is critical for the practical application of QDs in various nano- and biotechnologies."

For more information on this research see: Quantitative Compositional Profiling of Conjugated Quantum Dots with Single Atomic Layer Depth Resolution via Time-of-Flight Medium-Energy Ion Scattering Spectroscopy. Analytical Chemistry, 2014;86(2):1091-1097. Analytical Chemistry can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Analytical Chemistry -

Our news journalists report that additional information may be obtained by contacting K.W. Jung, Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil. Additional authors for this research include H. Yu, W.J. Min, K.S. Yu, M.A. Sortica, P.L. Grande and D. Moon.

Keywords for this news article include: Brazil, Porto Alegre, Quantum Dots, South America, Quantum Physics, Analytical Chemistry

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Source: Energy Weekly News

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