A novel fluorescence enhanced route to detect copper(II) by click chemistry-catalyzed connection of Au@SiO2 and carbon dots

作者：Zhou, Yuan; Ma, Zhanfang^*

来源：Sensors and Actuators B: Chemical , 2016, 233: 426-430.

DOI：10.1016/j.snb.2016.04.112

• Copper ion
• Click chemistry
• Fluorescence detection
• Au@SiO2 core shell
• Carbon dots

Pursuing for a simple, sensitive and inexpensive method of detecting copper ions is very essential for both environment and human health. Herein, a new strategy for fluorescence detection of Cu2+ was designed which is based on the reduction of Cu2+ to Cu+ by sodium ascorbate to get cycloaddition reaction between 4-azidobenzoic acid-tagged Au@SiO2 and propiolic acid-tagged carbon dots (CDs). The proposed approach not only possesses a good selectivity, but also has a linear relationship between the fluorescence intensity and the concentrations of Cu2+ in the range of 0.1-100 nM with the detection limit of 0.08 nM (5.12 x 10(-9) mg mL(-1)), which is far below the limit value of 1.3 mg mL(-1) defined by U.S. Environmental Protection Agency in drinkable water. In the actual sample, the standard deviation ranges from 97.6% to 101.8%, indicating the high precision of present approach.

• 出版日期2016-10-5
• 单位首都师范大学