Two-Dimensional Ag Nanoparticle Tetramer Array for Surface-Enhanced Raman Scattering Measurements
Two-Dimensional Ag Nanoparticle Tetramer Array for Surface-Enhanced Raman Scattering Measurements
复制标题
用于表面增强拉曼散射测量的二维银纳米粒子四聚体阵列
DOI：
10.1021/jp505160e
复制
发表时间：
2014-10-02
影响因子：
3.7
通讯作者：
Wu, Kai
中科院分区：
文献类型：
--
作者：
Chen, Jing;Gong, Yongji;Wu, Kai
通过电化学沉积在阳极氧化铝基板上成功制备了二维银纳米粒子四聚体阵列，作为热点矩阵，用于对浓度低至 10(15) M 的罗丹明 6G (R6G) 分子进行表面增强拉曼散射检测。高检测灵敏度归因于致密银纳米粒子四聚体热点基质的电磁增强和波纹基材的化学增强。当R6G浓度降低至10（15）M时，通过光谱中特征峰强度和线形的突然变化，通过实验检测到单分子动态吸附行为。时间演化光谱揭示了Ag纳米粒子之间25 nm纳米间隙中的单个分子或59 nm纳米间隙中的多个分子的吸附行为。
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(15) 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(15) M. Time-evolved spectroscopies revealed the adsorption behavior of either the single molecule in the nanogaps of 25 nm or multiple molecules in the nanogaps of 59 nm between the Ag nanoparticles.