Uniform and Homogeneous Growth of Copper Nanoparticles on Electrophoretically Deposited Carbon Nanotubes Electrode for Nonenzymatic Glucose Sensor

doi:10.1007/s40195-016-0476-0

Abstract

Abstract:

The multiwalled carbon nanotubes thin-film-based electrode was fabricated by electrophoretic deposition and modified with copper (Cu) nanoparticles to fabricate Cu/CNTs nanocomposite sensor for nonenzymatic glucose detection. The expensive glassy carbon electrode was replaced by fluorine-doped tin oxide glass containing CNTs film to confine the Cu nanoparticles growth by electrodeposition through cyclic voltammetry (CV). The ultraviolet visible and X-ray diffraction analysis revealed the successful deposition of Cu nanoparticles on the CNTs-modified electrode. The atomic force microscopy images confirmed the morphology of electrodeposited Cu on CNTs film as uniformly dispersed particles. The electrocatalytic activity of electrode to the glucose oxidation was investigated in alkaline medium by CV and amperometric measurements. The fabricated sensor exhibited a fast response time of less than 5 s and the sensitivity of 314 μA mM^-1 cm^-2 with linear concentration range (0.02-3.0 mM) having detection limit 10.0 μM. Due to simple preparation of sensor, Cu/CNTs nanocomposite electrodes are a suitable candidate for reliable determination of glucose with good stability.

Key words: Electrophoretic deposition (EPD), Fluorine-doped tin oxide (FTO) substrate, Carbon nanotubes, Copper nanoparticles, Nonenzymatic electrocatalysis, Glucose sensor

Syeda Ammara,Shahzadi Shamaila,Rehana Sharif,Sheeba Ghani,Nosheen Zafar. Uniform and Homogeneous Growth of Copper Nanoparticles on Electrophoretically Deposited Carbon Nanotubes Electrode for Nonenzymatic Glucose Sensor[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(10): 889-894.

Figures/Tables 8

Fig. 1 UV-Vis spectrum of Cu/CNTs nanocomposite electrode

Fig. 2 AFM image a and histogram b of Cu/CNTs nanocomposite electrode; c AFM image of CNTs-modified electrode

Fig. 3 XRD pattern of Cu/CNTs nanocomposite electrode

Fig. 4 Cyclic voltammetry curves of CNTs and Cu/CNTs electrode at scan rate of 50 mV/s

Fig. 5 Cyclic voltammetry of CNTs electrode (curves a, b) and Cu/CNTs electrode (curves c, d) before (curves a, c) and after (curves b, d) adding 0.5 mM glucose in 0.1 mM NaOH solution at scan rate of 20 mV/s

Fig. 6 Cyclic voltammetry curves of Cu/CNTs electrode at scan rate of 20, 60, 80, 100 and 150 mV/s (curves a-e). Inset linear variation of redox peak currents with square root of scan rate

Fig. 7 Current time response of Cu/CNTs electrode to various concentration of glucose in 0.1 M NaOH solution. Inset current response versus glucose concentration

Fig. 8 Stability of the Cu/CNTs electrode. The determination solution is 0.1 M NaOH with 0.5 mM glucose at 0.65 V. Inset interference test of Cu/CNTs electrode with 0.3 mM glucose and 0.002 mM each ascorbic acid (AA) and uric acid (UA)

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