Investigation on the effect of gold nanoparticles decorated zinc oxide nanorods as glucose sensor
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Date
2016-06
Authors
Hoo Xiao Fen
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Abstract
In this work, gold nanoparticles (AuNPs) were synthesised using the seeding growth method. Various sizes of spherical AuNPs were formed by varying the volume of gold seed, hydroxylamine hydrochloride and gold chloride. Zinc oxide nanorods (ZnONRs) were produced using hydrothermal growth on seeded indium tin oxide (ITO) substrates. Zinc acetate sol seed was dropped on ITO substrates and heated at 150°C in oven. The ITO substrates were then heated at 500°C for 2 hours in a preheated tube furnace to obtain ZnO seed. The substrates were then immersed into a hydrothermal solution and heated at 80°C for 4 hours. The synthesised AuNPs were drop casted on ZnONRs/ITO electrodes and air dried. Enzymatic glucose oxidase (GOx) and nafion were dropped on the produced electrodes. Electrochemical activity of Nafion/GOx/AuNPs/ZnONRs/ITO electrodes in glucose detection was studied using cyclic voltammetry. The effect of parameters on the electrochemical activity investigated were size of AuNPs, volume of AuNPs and volume of GOx. The optimised electrode was Nafion/60 μl GOx/80μl 30nm AuNPs/ZnONRs/ITO with high sensitivity of 3.41 μA/mM·cm2, wide linear range of 0.1 – 20 mM and low limit of detection of 1.17 mM.