Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7145865 | Sensors and Actuators B: Chemical | 2015 | 16 Pages |
Abstract
A simple label-free colorimetric sensor for sulfate has been devised based on the analyte-induced shielding of peroxidase-like activity of cysteamine-capped gold nanoparticles (cyst-AuNPs). Aggregation triggered by sulfate through hydrogen bond and electrostatic interaction gave rise to a remarkable decrease of the catalytic activity of AuNPs. By coupling with 3,3â²,5,5â²-tetramethylbenzidine (TMB)-H2O2 chromogenic reaction, a novel colorimetric sensor for detection of sulfate was established. Based on the signal amplification effect of the catalytic reaction, a detection limit as low as 0.16 μM was obtained by virtue of UV-vis spectroscopy or 4 μM with the naked-eye observation. The as-proposed sensor exhibited an excellent selectivity over other common anions and metallic ions. In view of these characteristics, such sensing probe features simplicity, cost-effectiveness, and naked-eye screening. These advantages make this sensor a powerful protocol for the quantitative detection of sulfate in water samples with satisfactory results.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Dan Zhao, Chuanxia Chen, Lixia Lu, Fan Yang, Xiurong Yang,