Two-Dimensional Ag Nanoparticle Tetramer Array for Surface-Enhanced Raman Scattering Measurements
详细信息 查看全文
- 作者：Jing Chen ; Yongji Gong ; Jian Shang ; Jianlong Li ; Yu Wang ; Kai Wu
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：October 2, 2014
- 年：2014
- 卷：118
- 期：39
- 页码：22702-22710
- 全文大小：519K
- ISSN：1932-7455
文摘
A two-dimensional Ag nanoparticle tetramer array which served as a hotspot matrix for surface-enhanced Raman scattering detection of rhodamine 6G (R6G) molecules down to a concentration as low as 10鈥?5 M was successfully fabricated by electrochemical deposition on an anodized aluminum substrate. The high detection sensitivity was attributed to both the electromagetic enhancement at the dense Ag nanoparticle tetramer hotspot matrix and chemical enhancement on the corrugated substrate. A single molecule dynamic adsorption behavior was experimentally sensed by the abrupt changes of the charateristic peak intensity and line shape in the spectroscopy when the R6G concentration was lowered to 10鈥?5 M. Time-evolved spectroscopies revealed the adsorption behavior of either the single molecule in the nanogaps of 2鈥? nm or multiple molecules in the nanogaps of 5鈥? nm between the Ag nanoparticles.