Potentiometric Zinc Ion Sensor Based on Honeycomb-Like NiO Nanostructures

Sensors

Mazhar Ali Abbasi²  Zafar Hussain Ibupoto²  Mushtaque Hussain²  Yaqoob Khan¹  Azam Khan²  Omer Nur² 

[1] Nanosciences and Catalysis Division, National Centre for Physics, Quaid-e-Azam University Campus, 45320 Islamabad, Pakistan; E-Mail:;Physical Electronic and Nanotechnology Division, Department of Science and Technology, Campus Norrköping, Linköping University, SE-60174 Norrköping, Sweden; E-Mails:

关键词: honeycomb NiO nanostructures;    potentiometric response;    ion selective electrode;    selectivity;    selective ionophore;   

DOI  :  10.3390/s121115424

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.