Electrospun Cu-doped In2O3 hollow nanofibers with enhanced H2S gas sensing performance

Abstract One-dimensional nanofibers can be transformed into hollow structures with larger specific surface area, which contributes to the enhancement of gas adsorption. We firstly fabricated Cu-doped In 2 O 3 (Cu-In ) by electrospinning and calcination for detecting H S. The experimental results show that Cu doping concentration besides operating temperature, concentration, relative humidity greatly affect S sensing performance -based sensors. particular, responses 6%Cu-In are 350.7 4201.5 50 100 ppm at 250 °C, over 20 140 times higher than those pristine nanofibers, respectively. Moreover, corresponding sensor exhibits excellent selectivity good reproducibility towards S, response is still 1.5 1 Finally, mechanism Cu-In2O3 thoroughly discussed, along assistance first-principles calculations. Both formation structure contribute provide more active sites, meanwhile a little CuO form p–n heterojunctions react resulting in significant improvement performance. Cu-In tailored practical application selectively detect lower concentrations.