期刊
APPLIED SURFACE SCIENCE
卷 322, 期 -, 页码 136-142出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2014.10.095
关键词
Gold nanostars; Surface-enhanced Raman scattering (SERS); Localized surface plasmon resonance (LSPR); Absorption spectrum
类别
资金
- Fundamental Research Funds for the Central Universities [2011jdgz17]
- National Natural Science Foundation of China [11174232, 61178075, 81101122]
The surface-enhanced Raman scattering (SERS) activity of the gold nanostars with vimineous branches has been investigated by using rhodamine 6G (R6G) as the Raman active probe. The colloidal gold nanostars have two intense localized surface plasmon resonance (LSPR) peaks in the visible and infrared ranges, respectively. Besides the visible LSPR dependent local field effect induced Raman signal enhancement, the SERS ability also greatly depends on the infrared absorption from the plasmon resonance along the aligned branches. Whether increasing the peak intensity or wavelength of the infrared absorption leads to the efficient improvement of SERS. These correlations between plasmonic absorption and SERS indicate that the lightning rod effect and creation of hot spots have been enhanced with the length and number of gold branches. (C) 2014 Elsevier B.V. All rights reserved.
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