Photoelectrochemical immunosensing of tetrabromobisphenol A based on the enhanced effect of dodecahedral gold nanocrystals/MoS2 nanosheets
Photoelectrochemical immunosensing of tetrabromobisphenol A based on the enhanced effect of dodecahedral gold nanocrystals/MoS2 nanosheets
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基于十二面体金纳米晶/MoS2纳米片增强效应的四溴双酚A光电化学免疫传感
DOI：
10.1016/j.snb.2017.01.140
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发表时间：
2017-06
期刊：
影响因子：
--
通讯作者：
Li Chunya
中科院分区：
文献类型：
--
作者：
Wang Yanying;Chen Fang;Ye Xiaoxue;Wu Tsunghsueh;Wu Kangbing;Li Chunya
Dodecahedral gold nanocrystals (AuNCs) were synthesized by using a 1-(10-bromodecyl)-3-methylimidazolium bromide ionic liquid as functional monomer and protectant. AuNCs were self-assembled onto molybdenum disulfite (MoS2) nanosheets to fabricate AuNCs/MoS2nanocomposite, which was drop-coated onto a glassy carbon electrode surface to generate an interface for transthyretin (TTR) immobilizing. With a similar chemical structure to thyroxine, tetrabromobisphenol A (TBBPA) was specifically recognized by transthyretin and the TTR/AuNCs/MoS2/GCE provides a sensing platform for TBBPA. Its sensing performance towards TBBPA was found significantly improved by the integration of AuNCs onto MoS2nanosheets. Three conditions for assay development, such as incubation time, incubation temperature, and pH value, were investigated and found the optimum conditions were 200 s, 35 °C, and pH 7.0 respectively. Under these conditions, the ratio [Ri= (i0−i)/i0] between the photocurrent variation (△i=i0−i) and the original photocurrent (i0) is linearly related to the logarithm of TBBPA concentration (cTBBPA) from 0.1 nM to 1.0 μM. The linear relationship can be described by the following equation:Ri= 0.09092 logcTBBPA(M) + 0.8976 (R = 0.993). The detection limit is calculated to be 0.045 nM (S/N = 3). The photoelectrochemical immunosensor was used to accurately determine TBBPA concentration in South-Lake spiked water samples.
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