文献类型：期刊文献

英文题名：Bimetallic AuCu nanoparticles coupled with multi-walled carbon nanotubes as ion-to-electron transducers in solid-contact potentiometric sensors

作者：Liu, Yueling[1];Liu, Yang[1];Yan, Rui[1];Gao, Yingying[1];Wang, Ping[1]

机构：[1]East China Univ Sci & Technol, Biomed Nanotechnol Ctr, Sch Biotechnol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：331

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20194907791711);WOS:【SCI-EXPANDED(收录号:WOS:000506011100101)】；

基金：This workwas financially supported by National Natural Science Foundation of China (Grants 21804043, 21636003), Shanghai Sailing Program (Grant 18YF1405800) and the Fundamental Research Funds for the Central Universities of East China University of Science and Technology (Grant 222201814034).

语种：英文

外文关键词：Nanocomposite; Transducer; Bimetallic AuCu nanoparticles; Multi-walled carbon nanotubes; Solid-contact ion-selective electrode

摘要：This work reports the first implementation of potentiometric solid-contact ion-selective electrodes (SC-ISEs) using the nanocomposite of ordered bimetallic AuCu nanoparticles coupled with multi-walled carbon nanotubes (oAuCuNPs-MWCNTs) as transducers. The unexplored nanocomposite (oAuCuNPs-MWCNTs) is deposited by solvent casting on gold sputtered copper electrodes as an intermediate layer and then covered with ion-selective membranes to form potentiometric sensors. The performance of the sensors is evaluated by determining Ca2+ and SO42- as an example of cation and anion, respectively. The obtained electrodes show response slopes of 29.0 mV/decade for Ca2+-selective SC-ISEs from 10(-6) to 10(-1) M, and -27.0 mV/decade for SO42--selective SC-ISEs from 10(-5) to 10(-1) M. Moreover, they exhibit high double layer capacitance (54 mu F for Ca2+-selective SC-ISEs and 105 mu F for SO42--selective SC-ISEs), fast charge transfer (resistance of 2.22 M Omega for Ca2+-selective SC-ISEs and 0.46 M Omega for SO42--selective SC-ISEs) and low potential drift (15 +/- 3 mu V/h for Ca2+-selective SC-ISEs and 118 +/- 16 mu V/h for SO42--selective SC-ISEs over 12 h). Additionally, none of the redox reactions, light interference and water films is observed. These results indicate that the combination of bimetallic nanoparticles and carbon nanomaterials offers great promise for the development of more robust and useful electrochemical sensors. (C) 2019 Elsevier Ltd. All rights reserved.