Abstract
Carbon nanotubes (CNTs) are potential candidates for wearable gas monitoring devices based on their large surface area, room temperature response and flexibility. Considering the demand on sensitivity and flexibility, innovated structural design is essential for realizing those applications. Here, we present a carbon nanotubes-anatase titanium dioxide (CNT/a-TiO2) film-based sensor by in situ hydrolysis and calcination. The CNT/a-TiO2 sensor exhibits good sensitivity (41% resistance change in response to 50 ppm NO), fast and reversible response at room temperature, and high selectivity toward NO among several toxic gases including NH3, NO2, CH4 and H2S. Furthermore, the continuous CNT/a-TiO2 network, consisting of numerous flexible micro-areas of CNT segments interlaced with rigid CNT/a-TiO2 active segments, can endure complex deformations while maintaining their superior sensing properties. These lightweight CNT/a-TiO2 films with high performance and intrinsic flexibility films have application potential in future wearable electronics and gas monitoring devices.
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