Enzyme-free glucose sensors have attracted remarkable attention rather than enzyme-based glucose biosensors due to their high stability, reproducibility and low price. In this work, a nonenzymatic glucose sensor based on CdxZn1-xS nanofilms on TiO2 nanotube arrays (CdxZn1-xS/TiO2 NTAs) has been fabricated. The morphology of the electrode was examined by TEM and SEM techniques. Elemental mapping, XPS analysis, the XRD technique, and the EDS method were employed to investigate the crystal phase and the presence of elements in the composition. The modified electrode has an outstanding photocurrent response with an increase of almost four times compared to TiO2 NTAs. This CdxZn1-xS/TiO2 NTAs heterostructure possesses superior sensing properties with high sensitivity of 1331.7 mu A mM(-1).cm(-2), a linear range of 0-214 mu M, and a detection limit of 0.225 mu M at a signal-to-noise ratio of 3. Discrete architectures comprising CdxZn1-xS immobilized on a TiO2 nanotube array substrate significantly improved the sensor's stability and reusability. Additionally, this cost-effective modified sensor was successfully applied for screening glucose in real plasma samples.
