金纳米棒比色法检测铜离子

Colorimetric Sensing of Copper(Ⅱ) Based on Catalytic Etching of Gold Nanorods

一种基于铜氨络离子催化氧化金纳米棒的传感器针剥Cu2＋实现分析检测。对金纳米棒的刻蚀过程，导致在金纳米棒长径比的变化，引起纵向表面等离子体共振吸收峰的蓝移和溶液颜色的变化。文章报道的无标记Cu2＋纳米比色传感器具有较商的灵敏度。此传感器具有较好的灵敏度，实现Cu2＋在3×10-8-5×10-7M范围内的可视化检测。最低检出限为2．7nM。

A new method based on the fact that copper （ II ） tetra-ammine complex catalytic oxidizing gold nanorods （GNRs） in the S2O32--leaching system has been developed for the determination of Cu2＋ in aqueous solution. The etching procedure would lead to a dramatic decrease of the GNRs in length but little in diameter, causing the longitudinal surface Plasmon resonance （LSPR） absorption blue shifts and solution color changed. The sensor possessed a surprising sensitivity which allowed the clear visual detection of Cu2＋ ion ranging from 3×10-8 to 5×10-7 M, with a limit of detection 2.7 nM.