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A Selective Iodide Ion Sensor Electrode Based on Functionalized ZnO Nanotubes
Department of Science and Technology, Campus Norrköping, Linköping University, SE-60174 Norrköping, Sweden
* Author to whom correspondence should be addressed.
Received: 3 December 2012; in revised form: 29 January 2013 / Accepted: 29 January 2013 / Published: 4 February 2013
Abstract: In this research work, ZnO nanotubes were fabricated on a gold coated glass substrate through chemical etching by the aqueous chemical growth method. For the first time a nanostructure-based iodide ion selective electrode was developed. The ZnO nanotubes were functionalized with miconazole ion exchanger and the electromotive force (EMF) was measured by the potentiometric method. The iodide ion sensor exhibited a linear response over a wide range of concentrations (1 × 10−6 to 1 × 10−1 M) and excellent sensitivity of –62 ± 1 mV/decade. The detection limit of the proposed sensor was found to be 5 × 10−7 M. The effects of pH, temperature, additive, plasticizer and stabilizer on the potential response of iodide ion selective electrode were also studied. The proposed iodide ion sensor demonstrated a fast response time of less than 5 s and high selectivity against common organic and the inorganic anions. All the obtained results revealed that the iodide ion sensor based on functionalized ZnO nanotubes may be used for the detection of iodide ion in environmental water samples, pharmaceutical products and other real samples.
Keywords: ion selective electrode; ZnO nanotubes; miconazole nitrate; potentiometric technique; potentiometric titration
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MDPI and ACS Style
Ibupoto, Z.H.; Khun, K.; Willander, M. A Selective Iodide Ion Sensor Electrode Based on Functionalized ZnO Nanotubes. Sensors 2013, 13, 1984-1997.
Ibupoto ZH, Khun K, Willander M. A Selective Iodide Ion Sensor Electrode Based on Functionalized ZnO Nanotubes. Sensors. 2013; 13(2):1984-1997.
Ibupoto, Zafar H.; Khun, Kimleang; Willander, Magnus. 2013. "A Selective Iodide Ion Sensor Electrode Based on Functionalized ZnO Nanotubes." Sensors 13, no. 2: 1984-1997.