Direct visual detection of MnO2 nanosheets within seconds
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- 作者：Yi He ; Zeru Wang ; Dengying Long
- 关键词：Visual detection ; MnO2 nanosheets ; Single layer ; Redox ; 3 ; 3′ ; 5 ; 5′-Tetramethylbenzidine
- 刊名：Analytical and Bioanalytical Chemistry
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：408
- 期：4
- 页码：1231-1236
- 全文大小：966 KB
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Zeru Wang (1)
Dengying Long (1)
1. School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Analytical Chemistry
Food Science
Inorganic Chemistry
Physical Chemistry
Monitoring, Environmental Analysis and Environmental Ecotoxicology - 出版者：Springer Berlin / Heidelberg
- ISSN：1618-2650
文摘
The increasing application of nanomaterials will inevitably lead to their release into the environment, which may pose a threat to the environment and human health. As such, there is an urgent need to detect various nanomaterials. In the present work, we present a novel, rapid, and simple visual detection of MnO2 nanosheets in buffer solution and environmental water sample. In this assay, a redox reaction between MnO2 nanosheets and 3,3′,5,5′-tetramethylbenzidine (TMB) occurred, leading to the oxidation of TMB to TMB diimine. This redox reaction generated different colors dependent on the concentration of MnO2 nanosheets, including colorless, blue, green, and yellow, which allowed semiquantitative detection of MnO2 nanosheets with the naked eye. The detection range of the visual assay was 2–15 μg/mL, and the minimum concentration of MnO2 nanosheets can be visually detected at concentrations down to 2.0 μg/mL. Moreover, the developed visual assay showed a high selectivity to MnO2 nanosheets over Mn2+ ions, tetramethylammonium hydroxide, hydrogen peroxide, graphene oxide, and graphitic carbon nitride nanosheets.