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Sensors 2012, 12(11), 15424-15437; doi:10.3390/s121115424

Potentiometric Zinc Ion Sensor Based on Honeycomb-Like NiO Nanostructures

Physical Electronic and Nanotechnology Division, Department of Science and Technology, Campus Norrköping, Linköping University, SE-60174 Norrköping, Sweden
Nanosciences and Catalysis Division, National Centre for Physics, Quaid-e-Azam University Campus, 45320 Islamabad, Pakistan
Author to whom correspondence should be addressed.
Received: 10 September 2012 / Revised: 1 November 2012 / Accepted: 6 November 2012 / Published: 9 November 2012
(This article belongs to the Section Chemical Sensors)
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In this study honeycomb-like NiO nanostructures were grown on nickel foam by a simple hydrothermal growth method. The NiO nanostructures were characterized by field emission electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) techniques. The characterized NiO nanostructures were uniform, dense and polycrystalline in the crystal phase. In addition to this, the NiO nanostructures were used in the development of a zinc ion sensor electrode by functionalization with the highly selective zinc ion ionophore 12-crown-4. The developed zinc ion sensor electrode has shown a good linear potentiometric response for a wide range of zinc ion concentrations, ranging from 0.001 mM to 100 mM, with sensitivity of 36 mV/decade. The detection limit of the present zinc ion sensor was found to be 0.0005 mM and it also displays a fast response time of less than 10 s. The proposed zinc ion sensor electrode has also shown good reproducibility, repeatability, storage stability and selectivity. The zinc ion sensor based on the functionalized NiO nanostructures was also used as indicator electrode in potentiometric titrations and it has demonstrated an acceptable stoichiometric relationship for the determination of zinc ion in unknown samples. The NiO nanostructures-based zinc ion sensor has potential for analysing zinc ion in various industrial, clinical and other real samples.
Keywords: honeycomb NiO nanostructures; potentiometric response; ion selective electrode; selectivity; selective ionophore honeycomb NiO nanostructures; potentiometric response; ion selective electrode; selectivity; selective ionophore
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Abbasi, M.A.; Ibupoto, Z.H.; Hussain, M.; Khan, Y.; Khan, A.; Nur, O.; Willander, M. Potentiometric Zinc Ion Sensor Based on Honeycomb-Like NiO Nanostructures. Sensors 2012, 12, 15424-15437.

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