化学
吸附
检出限
纳米颗粒
水溶液
氩
氧气
银纳米粒子
分子
氧化物
光化学
无机化学
化学工程
色谱法
有机化学
工程类
作者
M. Erol,Yun Han,Scott K. Stanley,Christopher M. Stafford,Henry Du,Svetlana A. Sukhishvili
摘要
Oxidation of the Ag nanoparticle surface has a dramatic effect on the adsorption, orientation, and SERS detection limit of nitroaromatic molecules in aqueous solutions. Ultrasensitive SERS detection of p-nitrophenol can be achieved when oxidation of surface-immobilized Ag nanoparticles is inhibited by replacing the oxygen dissolved in water with argon gas. The presence of silver oxide at the nanoparticle surface hinders charge transfer between the aromatic ring and the underlying Ag metal surface and drastically decreases the overall detection sensitivity.
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