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.
Highlights
Iodine is one of the important constituents among other human nutrients due to it’s key contributions in many biological pathways such as enrichment of brain development, metabolism, Sensors 2013, 13 neurological functions and thyroid gland activity, etc
ZnO nanotubes with the ion exchanger miconazole nitrate
The iodide ion selective electrode based on the ZnO nanotubes demonstrated a highly linear range of detection from 1 × 10−6 M to 1 × 10−1 M for iodide anion with a good sensitivity of −62 ± 1 mV/decade and a regression coefficient of 0.99
Summary
Iodine is one of the important constituents among other human nutrients due to it’s key contributions in many biological pathways such as enrichment of brain development, metabolism, Sensors 2013, 13 neurological functions and thyroid gland activity, etc. Over the last 20 years, a number of papers on iodide ion sensors have been published based on the different derivatives such as Mn (IV) [15,16], Co (III) [17,18], Sn (IV) [19,20], Mo (V) [21], porphyrin complexes, Co (II), Cu (II) phthalocyanine derivatives [22], Hg (II) complex [23,24], and Co (II) triazole derivative [25], etc Many of these iodide ion selective electrodes have some working limitations such as low linearity, slow response times and high limits of detection for the target electrolyte. The iodide ion sensor has shown low limit of detection, fast response time, high sensitivity, selectivity and stability
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