Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6613537 | Electrochimica Acta | 2014 | 31 Pages |
Abstract
A solid-state sensor based on polytyramine film deposited at glassy carbon electrode doped with tris(2,2â²-bipyridyl)Ru(II) complex (Ru/Pty/GCE) was constructed electrochemically. A redox property represented by [Ru(bpy)3]3+/2+ couple immobilized at the Pty moiety was characterized using typical voltammetric techniques. The XPS data and AFM images confirm the grafting of Ru species on the top of Pty while the electrochemical impedance spectroscopy (EIS) data supports the immobilization of both surface modifiers onto the GCE. The constructed sensor exhibits a substantial reactivity, stability and high sensitivity to chlorpheniramine maleate (CPM) oxidation. The detection limit (S/NÂ =Â 3) was brought down to 338Â nM using differential pulse voltammetry method. Thermodynamic and kinetic parameters were evaluated using hydrodynamic method. The apparent diffusion coefficient and the heterogeneous electron transfer rate constant for the CPM oxidation were 2.67Â ÃÂ 10â5Â cm2 sâ1 and 3.21Â ÃÂ 10â3Â cm sâ1, respectively. Interference studies and real sample analysis were conducted with excellent performance and satisfactory results.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Emad A. Khudaish, Mohammed Al-Hinaai, Salim Al-Harthy, Karthik Laxman,