Abstract
Hydrogen (H(2)) has gradually become a substitute for traditional energy, but its potential danger cannot be ignored. In this study, litchi-like g-C(3)N(4)/In(2)O(3) composites were synthesized by a hydrothermal method and used to develop H(2) sensors. The morphology characteristics and chemical composition of the samples were characterized to analyze the gas-sensing properties. Meanwhile, a series of sensors were tested to evaluate the gas-sensing performance. Among these sensors, the sensor based on the 3 wt% g-C(3)N(4)/In(2)O(3) (the mass ratio of g-C(3)N(4) to In(2)O(3) is 3:100) showeds good response properties to H(2), exhibiting fast response/recovery time and excellent selectivity to H(2). The improvement in the gas-sensing performance may be related to the special morphology, the oxygen state and the g-C(3)N(4)/In(2)O(3) heterojunction. To sum up, a sensor based on 3 wt% g-C(3)N(4)/In(2)O(3) exhibits preeminent performance for H(2) with high sensitivity, fast response, and excellent selectivity.