An Electrochemical Sensor based on p-aminothiophenol/Au Nanoparticle-Decorated H_xTiS₂ Nanosheets for Specific Detection of Picomolar Cu (II)

详细信息    查看全文

• 作者：Xiaorong Gan ; Huimin Zhao ; ^{zhaohuim@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xie Quan ; Yaobin Zhang
• 关键词：Electrochemical sensors ; HxTiS2 nanosheets ; Au nanoparticles ; PATP ; Cu2+ detection
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：190
• 期：Complete
• 页码：480-489
• 全文大小：1850 K

文摘

An ultrasensitive electrochemical sensor for Cu²⁺ detection was first developed based on p-aminothiophenol (PATP) anchored on the surface of Au nanoparticle-decorated hydrogen-incorporated TiS₂ nanosheets (PATP/Au-H_xTiS₂). In the synthesis process, the plane edges of H_xTiS₂ nanosheets offered Au nanoparticles with incubation sites for the heterogeneous nucleation and growth. On the other hand, Au nanoparticles were not only served as an excellent electrical catalyst to facilitate electron transfer and as a substrate for loading PATP molecules by Au-S valent bonds, but also could effectively avoid the aggregation of H_xTiS₂ nanosheets. Due to the synergetic effects from Au-H_xTiS₂ for signal amplification, the as-formed electrochemical sensor exhibited highly sensitive and selective assaying of Cu²⁺ with a detection limit of 90 pM (3σ) and a linear range from 0.2 nM to 5 μM, under optimal conditions. Its specificity was ascribed to the strong coordination interaction between Cu²⁺ and N atoms of imine moieties in PATP after electrochemical oxidation.