期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 215, 期 -, 页码 437-444出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.04.010
关键词
Colorimetric sensor; Sulfate; Gold nanoparticles; Peroxidase-like activity; 3,3 ',5,5 '-tetramethylbenzidine
资金
- National Natural Scicnce Foundation of China [21435005, 21175124]
- Development Project of Science and Technology of Jilin Province, China [20125090]
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 3,3',5,5'-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 mu M was obtained by virtue of UV-vis spectroscopy or 4 mu M 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. (C) 2015 Elsevier B.V. All rights reserved.
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