Shell-isolated nanoparticle-enhanced Raman spectroscopy

Jian Feng Li, Yi Fan Huang, Yong Ding, Zhi Lin Yang, Song Bo Li, Xiao Shun Zhou, Feng Ru Fan, Wei Zhang, Zhi You Zhou, Wu De Yin, Bin Ren, Zhong Lin Wang () and Zhong Qun Tian ()
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Jian Feng Li: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Yi Fan Huang: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Yong Ding: School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245, USA
Zhi Lin Yang: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Song Bo Li: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Xiao Shun Zhou: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Feng Ru Fan: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Wei Zhang: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Zhi You Zhou: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Wu De Yin: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Bin Ren: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University
Zhong Lin Wang: School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332–0245, USA
Zhong Qun Tian: State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University

Nature, 2010, vol. 464, issue 7287, 392-395

Abstract: Raman spectroscopy unleashed Surface-enhanced Raman scattering (SERS) spectroscopy is a powerful analytical technique able to detect substances down to single molecule level. Its applications are limited, however, because to realize a substantial Raman signal requires metal substrates that either have roughened surfaces or take the form of nanoparticles. An innovative approach is now demonstrated, where the substance under investigation, on a generic substrate, is covered by a layer of 'smart dust' consisting of gold nanoparticles coated by an ultrathin insulating shell of silica or alumina. The nanoparticles provide Raman signal amplification, and the coating keeps them separate from each other and from the probed substance. The new technique, termed SHINERS (shell-isolated nanoparticle-enhanced Raman spectroscopy), is demonstrated by probing pesticide residues on the surfaces of yeast cells and citrus fruits. It could be useful in materials science and the life sciences, as well as for the inspection of food safety, drugs, explosives and environmental pollutants.

Date: 2010
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DOI: 10.1038/nature08907

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