期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 156, 期 1, 页码 43-49出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.03.071
关键词
Trinitrotoluene; Molecular imprinting; Au nanoparticles; Electrochemical sensor; Environmental water samples
资金
- Science & Technology Commission of Shanghai Municipality [10JC1404000]
- Fundamental Research Funds for the Central Universities
- Natural Science Foundation of Shanghai [11ZR1410700]
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes of ECNU
In this work, we demonstrated a sensitive and selective electrochemical sensing protocol for the detection of TNT prepared from alkanethiols self-assembled on AuNPs modified glassy carbon (GC) electrode with preadsorbed templates of TNT. It demonstrated that the 2D molecular imprinting monolayers (MIMs) can provide a better site accessibility and lower mass-transfer resistance, while the AuNPs can enhance electrode conductivity, facilitate the electron transfer and increase the amount of TNT-imprinted sites. The prepared sensor showed not only high selectivity toward TNT in comparison to other similar nitroaromatic compounds (NACs), but also a wide linear range over TNT concentration from 4.0 x 10(-8) to 3.2 x 1 0(-6) M with a detection limit of 1.3 x 10(-8) M (SIN = 3). Moreover, the imprinted sensor has been applied to the determination of TNT in spiked environmental water samples and shows promise for fast and sensitive measurement of trace levels of TNT in real samples. (C) 2011 Elsevier B.V. All rights reserved.
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