▎ 摘　　要

Recently, metal organic frameworks (MOFs) received more and more attentions in gas sensors due to their characterizations of well-defined morphologies and open-metal sites. Here, pure alpha-Fe2O3 spindles were prepared by using the Fe-MIL-88 as precursor and the product was successfully combined with 1 wt% reduced graphene oxide (rGO) through a simple solvothermal method. The element compositions and microstructures were characterized by a series of techniques. According to the consequences, pure alpha-Fe2O3 spindles exhibited porous nanostructures and were adhered adequately on the surface of rGO. And the length-width ratio of most a-Fe2O3 spindles is about 4:1. Furthermore, the sensor based on rGO/alpha-Fe2O3 nanocomposites displayed better gas sensing performances than pure alpha-Fe2O3 spindles and the sensitivity increased from 12.18 to 34.33 towards 100 ppm triethylamine (TEA) at 300 degrees C. At the same time, rGO/alpha-F(e)2O(3) nanocomposites also possessed superior selectivity and short response/recover times. The enhanced sensors performance can be ascribed to the porous nanostructures and P/N heterojunction between alpha-Fe2O3 and rGO.