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Journal of Nanotechnology
Volume 2012 (2012), Article ID 619062, 6 pages
http://dx.doi.org/10.1155/2012/619062
Research Article

Selective Thallium (I) Ion Sensor Based on Functionalised ZnO Nanorods

Department of Science and Technology, Linköping University, Campus Norrköping, 60174 Norrköping, Sweden

Received 14 February 2012; Accepted 5 August 2012

Academic Editor: Jinhui Song

Copyright © 2012 Z. H. Ibupoto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Well controlled in length and highly aligned ZnO nanorods were grown on the gold-coated glass substrate by hydrothermal growth method. ZnO nanorods were functionalised with selective thallium (I) ion ionophore dibenzyldiaza-18-crown-6 (DBzDA18C6). The thallium ion sensor showed wide linear potentiometric response to thallium (I) ion concentrations (  M to  M) with high sensitivity of 36.87 ± 1.49 mV/decade. Moreover, thallium (I) ion demonstrated fast response time of less than 5 s, high selectivity, reproducibility, storage stability, and negligible response to common interferents. The proposed thallium (I) ion-sensor electrode was also used as an indicator electrode in the potentiometric titration, and it has shown good stoichiometric response for the determination of thallium (I) ion.