▎ 摘　　要

We systematically investigated the effects of process conditions and reduced graphene oxide (RGO) loading on the H2S gas-sensing performance of the alpha-Fe2O3 nanofibers (NFs) fabricated via on-chip electrospinning. The annealing temperature and precursor solution contents strongly influenced on the morphology and structure of the alpha-Fe2O3 NFs that accordingly affected on the gas-sensing performance. The optimum process conditions with the annealing temperature of 600 degrees C and the precursor solution contents of 11 wt% PVA and 4.0 wt% Fe(NO3)(3)center dot 9H(2)O led to the alpha-Fe2O3 NF sensors having a high response of similar to 6.1 at 1 ppm H2S gas. The RGO loading further improved the gas response, increasing the response to 1 ppm H2S gas up to similar to 9.2. Also, the RGO-loaded alpha-Fe2O3 NF sensors enhanced their selectivity and detection limit as compared with pure alpha-Fe2O3 NF sensors. The enhanced gas-sensing performance was attributed to the presence of nanograins, the increase of surface-to-volume ratio and the formation of potential barriers at nanograin homojunctions and RGO/alpha-Fe2O3 heterojunctions. (C) 2020 Elsevier B.V. All rights reserved.