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V2O5 Nanowires-Based Flexible Temperature Sensor

One-dimensional (1D) nanostructures such as nanowires (NWs) are being extensively used for the fabrication of novel sensors because of their single crystallinity, large aspect ratio, high surface-to-volume ratio, enhanced mechanical properties, and low dimensionality. Herein, we report a sensitive flexible temperature sensor based on vanadium pentoxide (V2O5) NWs. To achieve high temperature sensitivity and uniformity in device performance across large area, an array of 10x15 devices was developed using an ensemble of V2O5 NWs precisely assembled using dielectrophoresis (DEP). Using the optimized DEP conditions (200 Vpp and 500 kHz), we have achieved NW density of ~0.1 NW/µm per device. The electrical resistance of the fabricated temperature sensor is measured in the temperature range from room temperature to 45 °C, with sensitivity of ~0.01 °C-1, response time of ~73s and recovery time of ~40s. The present work shows the potential of aligned V2O5 NWs for high-performance temperature sensing in electronic-skin type applications.