ZnO thin film as non-enzymatic glucose sensor in an alkaline solution

In this work ZnO films were deposited on titanium substrates by sputtering technique for non-enzymatic glucose detection in an alkaline solution. The samples were grown using pulsed D.C. sputtering using a ZnO target; we kept constant the power at 100 W and varied the deposition time, in order to obtain films with different thickness. The properties of the samples were analyzed by X-ray diffraction (XRD), optical transmission, scanning electron microscopy (SEM), and electrochemical techniques. The results showed that the thickness of the samples varied with the deposition time. The electrochemical response studied by cyclic voltammetry revealed that the sensor response increased when the ZnO film thickness decreased. The electrochemical sensing device showed a sensitivity of 7.65 μA cm-2mM-1 with a linear response range of 3.3 mM to 11.0 mM.