Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

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Research Article, J Nanomater Mol Nanotechnol Vol: 4 Issue: 2

ZnO-nanoparticle Coated Multiwall Carbon Nanotube as a New Sensing Element for Highly Sensitive Potentiometric Determination of Thiosulfate Ion

Abdollah Yari* and Elham Gravand
Department of Chemistry, Faculty of Science, Lorestan University,Khorramabad, Iran
Corresponding author : Abdollah Yari
Department of Chemistry, Faculty of Science, Lorestan University 68137-17133, Khorramabad, Iran,
Tel/Fax: +98 66331200612
E-mail: [email protected]
Received: November 14, 2014 Accepted: March 30, 2015 Published: April 03, 2015
Citation: Yari A, Gravand E (2015) ZnO-nanoparticle Coated Multiwall Carbon Nanotube as a New Sensing Element for Highly Sensitive Potentiometric Determination of Thiosulfate Ion. J Nanomater Mol Nanotechnol 4:2. doi:10.4172/2324-8777.1000161

Abstract

ZnO-nanoparticle Coated Multiwall Carbon Nanotube as a New Sensing Element for Highly Sensitive Potentiometric Determination of Thiosulfate Ion

Here, we are reporting the response properties of a simple and useful potentiometric thiosulfate-selective electrode based on multiwall carbon nanotubes (MWCNTs) decorated with ZnO nanoparticles as sensing element. We successfully decorated the MWCNTs by using sol-gel process, which has not been reported to prepare such a decoration before. The ZnO-MWCNTs were characterized by XRD, SEM and TEM techniques. After optimization the composition requirements for construction the best electrode, the potentiometric response characteristics of the electrochemical sensor was examined for determination of thiosulfateanion in aqueous solutions. A Nernstian response of 30.3 ± 0.1 mV/dec with a detection limit of 1.24×10-7 M, a linear dynamic range of 1.35×10-7 to 1.45×10-1 M of thiosulfate and a response time of about 3 min are of good performance factors for the proposed electrode. The electrode demonstrated a reasonable repeatability and high selectivity towards the thiosulfate ion over the other tested anions in the solution.

Keywords: Carbon paste electrode; Potentiometry; Sol-gel; Thiosulfate; ZnO-coated multiwall carbon nanotube

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