Highly Selective Gas Sensor Based on Litchi-like g-C3N4/In2O3 for Rapid Detection of H2

Hydrogen (H-2) has gradually become a substitute for traditional energy, but its potential danger cannot be ignored. In this study, litchi-like g-C3N4/In2O3 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-C3N4/In2O3 (the mass ratio of g-C3N4 to In2O3 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-C3N4/In2O3 heterojunction. To sum up, a sensor based on 3 wt% g-C3N4/In2O3 exhibits preeminent performance for H-2 with high sensitivity, fast response, and excellent selectivity.

Automated summary

Litchi-like g-C3N4/In2O3 composites were synthesized and used to develop H-2 sensors. The sensor based on 3 wt% g-C3N4/In2O3 showed excellent response properties to H-2, with fast response/recovery time and high selectivity.