Amino Acid-Assisted Synthesis of Hierarchical Silver Microspheres for Single Particle Surface-Enhanced Raman Spectroscopy
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- 作者：Leilei Kang ; Ping Xu ; Dengtai Chen ; Bin Zhang ; Yunchen Du ; Xijiang Han ; Qing Li ; Hsing-Lin Wang
- 刊名：The Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：May 16, 2013
- 年：2013
- 卷：117
- 期：19
- 页码：10007-10012
- 全文大小：383K
- 年卷期：v.117,no.19(May 16, 2013)
- ISSN：1932-7455
文摘
We demonstrate the use of amino acids as directing agents to synthesize hierarchical silver microspheres assembled by nanosheets with well-defined morphologies, in the absence of any other surfactants or capping agents. This fabrication method avoids the absorption of macromolecules and enables clean surface on the Ag microspheres. The chemical nature of the amino acids plays a vital role in the hierarchical structure of the Ag microspheres. As found, amino acids with simple structures and 2鈥? carbon atoms like alanine and glycine lead to more loosely packed Ag microspheres, and those with more complicated structures and more carbon atoms, e.g. glycine, glutamine, and asparagine, result in close-packed Ag particles assembled by thinner nanosheets. By adjusting the concentration of AgNO3 solution, size as well as the surface roughness of the Ag microspheres can be well controlled. Individual particles of the constructed hierarchical Ag microspheres with highly roughened surface can act as sensitive SERS platforms. Detection of chemical molecules and monitoring of the plasmon-driven chemical reactions have been carried out through a single particle SERS technique.