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Studies Conducted at Donghua University on Raman Spectroscopy Recently Reported (Preparation of monodisperse bimetallic nanorods with gold nanorod...

July 22, 2014



Studies Conducted at Donghua University on Raman Spectroscopy Recently Reported (Preparation of monodisperse bimetallic nanorods with gold nanorod core and silver shell and their plasmonic property and SERS efficiency)

By a News Reporter-Staff News Editor at Journal of Technology -- Fresh data on Raman Spectroscopy are presented in a new report. According to news reporting from Shanghai, People's Republic of China, by VerticalNews journalists, research stated, "In this study, monodisperse bimetallic nanorods with gold (Au) nanorod core and silver (Ag) shell (Au@AgNRs) were synthesized through seed-mediated growth process by reduction of AgNO3 using Au nanorods with narrow size and shape distribution as seeds. With increasing the used amount of AgNO3, the Ag shell thickness of their lateral facets is raised faster than that of their two tips, leading to a decrease of their aspect ratios."

The news correspondents obtained a quote from the research from Donghua University, "Four plasmon bands are observable on the extinction spectra of Au@AgNRs, which are attributed to the longitudinal dipolar plasmon mode, transverse dipolar plasmon mode, and octupolar plasmon mode of the core-shell structured bimetallic nanorods, respectively. As their Ag shell thickness increases, their longitudinal plasmon band blue-shifts notably with the transverse plasmon band blue-shifting and the two octupolar plasmon bands red-shifting slightly, due to the decrease of their aspect ratios and enhancement of Ag plasmon resonance contribution. When used as surface-enhanced Raman scattering (SERS) substrate for probing minute amounts of 4-mercaptobenzoic acid in aqueous solution, Au@AgNRs have much stronger SERS activity than Au nanorods, and the obtained Raman signals are highly reproducible arising from their excellent monodispersity."

According to the news reporters, the research concluded: "Their SERS activity is remarkably increased with their Ag shell thickness thanks to the enhancing surface electric field and the chemical enhancement associated with electronic ligand effect."

For more information on this research see: Preparation of monodisperse bimetallic nanorods with gold nanorod core and silver shell and their plasmonic property and SERS efficiency. Journal of Raman Spectroscopy, 2014;45(6):431-437. Journal of Raman Spectroscopy can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell - www.wiley.com/; Journal of Raman Spectroscopy - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-4555)

Our news journalists report that additional information may be obtained by contacting X. Dong, Donghua Univ, Res Center Anal & Measurement, Shanghai 201620, People's Republic of China. Additional authors for this research include J.F. Zhou, X.Y. Liu, D.L. Lin and L.S. Zha.

Keywords for this news article include: Asia, Shanghai, Raman Spectroscopy, People's Republic of China

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


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Source: Journal of Technology


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