An Electrochemical Sensor based on p-aminothiophenol/Au Nanoparticle-Decorated HxTiS2 Nanosheets for Specific Detection of Picomolar Cu (II). (1st February 2016)

• Record Type: Journal Article
• Authors: Gan, Xiaorong; Zhao, Huimin; Quan, Xie; Zhang, Yaobin
• Is Part Of: Electrochimica acta. Volume 190(2016)
• Page Start: 480
• Page End: 489
• Publication Date: 2016-02-01
• Subjects: Electrochemical sensors -- HxTiS2 nanosheets -- Au nanoparticles -- PATP -- Cu2+ detection; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.12.145
• Languages: English
• ISSNs: 0013-4686

Abstract

ABSTRACT: An ultrasensitive electrochemical sensor for Cu 2+ detection was first developed based on p-aminothiophenol (PATP) anchored on the surface of Au nanoparticle-decorated hydrogen-incorporated TiS2 nanosheets (PATP/Au-H x TiS2 ). In the synthesis process, the plane edges of H x TiS2 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 x TiS2 nanosheets. Due to the synergetic effects from Au-H x TiS2 for signal amplification, the as-formed electrochemical sensor exhibited highly sensitive and selective assaying of Cu 2+ 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 Cu 2+ and N atoms of imine moieties in PATP after electrochemical oxidation.