A Well-Dispersed Pt/Ni/TiO2 Nanotubes Modified Electrode as an Amperometric Non-Enzymatic Glucose Biosensor

In this study a novel Pt/Ni nanostructure consisting of nano-bushes and nanocubes was fabricated onto TiO2 nanotubes. The scanning electron microscopy images showed that a large amount of well-dispersed nano-architectures had uniformly covered all over the surface which made an electrode with high surface area. It was obviously seen that the nanocube structures mainly consists of Ni had been grown on top of each other while the Pt colonies represented bush-like structures. As a non-enzymatic glucose biosensor, the Pt/Ni TiO2 nanotubes modified electrode exhibited an excellent performance. The proposed biosensor had two linear ranges for detection of glucose from 0 to 0.12 mM (correlation coefficient of 0.999) and from 0.1 to 10 mM (correlation coefficient of 0.997) with the detection sensitivity of 1629 and 259 mu A mM(-1) cm(-2) respectively. Moreover, its experimental detection limit was 0.5 mu M (Signal/Noise = 3). The experiment results also revealed that the electrode exhibited good reproducibility and long-term stability, as well as high selectivity with no interference from other oxidable species. All these results suggest that the proposed Pt/Ni/TiO2 nanotubes modified electrode can provide a promising material for the non-enzymatic glucose biosensor designs.