期刊
ANALYTICAL CHEMISTRY
卷 93, 期 29, 页码 10132-10140出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c01017
关键词
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资金
- National Natural Science Foundation of China [21874079]
- Taishan Scholars Program of Shandong Province [tsqn201909088]
- Outstanding Youth Innovation Team of Universities in Shandong Province [2019KJA027]
- Science & Technology Fund Planning Project of Shandong Colleges and Universities [J16LA13, J18KA112]
SnTe nanobelts with efficient oxidase-mimetic activity were synthesized by electrochemical exfoliation, and a specific inhibition effect of Cl- on their enzymatic behavior was discovered, leading to the development of a highly feasible Cl- colorimetric assay. Additionally, a signal on-off-on route based on the SnTe nanozyme was designed for reliable and specific Hg2+ detection.
Herein, SnTe nanobelts (NBs) with efficient oxidase-mimetic activity were synthesized by the simple electrochemical exfoliation method. A specific inhibition effect of Cl- on the enzymatic behavior of the pure SnTe NBs was discovered, which was accordingly used for establishing a highly feasible, sensitive, selective, and stable Cl- colorimetric assay. The detection concentration range was 50 nM to 1 mM, and the lowest detection limit was 20 nM for Cl-. In addition, a signal on-off-on route based on the SnTe NB nanozyme was designed to realize the reliable and specific detection of Hg2+. Therein, the SnTe NBs were grafted with gold nanoparticles to form a hybrid of SnTe/Au, resulting in the depression of the oxidase-like activity, which can then be recovered in the presence of the Hg2+ due to the formation of a gold amalgam. Especially, it was found that the high concentration of Cl- over 3 mM could again exert suppression influence toward the enzymatic activity of the SnTe/Au-Hg system. Based on the to-love-and-to-kill interaction between Cl- and Hg2+, the detection range for Cl- can be extended to 40 to 250 mM. In return, the assays of Cl- could avoid in advance its interference toward the accurate Hg2+ assays. We systematically clarified the oxidase-like catalytic mechanism of the SnTe-derived nanozyme systems. The as-proposed colorimetry can be successfully applied in practical samples including the sweat, human serum, or seawater/tap water, relating to cystic fibrosis, hyper-/ hypochloremia, or environmental control, respectively.
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