Enhanced acetone gas sensing performance of the multiple-networked Fe2O3-functionalized In2O3 nanowire sensor

In2O3 nanowires functionalized with Fe2O3 nanoparticles were synthesized by the thermal evaporation of In2S3 powders in an oxidizing atmosphere followed by the solvothermal deposition of Fe2O3 and their acetone gas sensing properties were examined. The pristine and Fe2O3-functionalized In2O3 nanowires exhibited responses of 141-390% and 298-960%, respectively, to 10-500 ppm acetone at 200 degrees C. The Fe2O3-functionalized In2O3 nanowire sensor showed stronger electrical response to acetone gas at 200 degrees C than the pristine In2O3 nanowire counterpart. The former showed more rapid response but slower recovery than the latter. Both the pristine and Fe2O3-functionalized In2O3 nanowire sensors showed the strongest response to acetone gas at 200 degrees C. The underlying mechanism for the enhanced sensing performance of the Fe2O3-functionalized In2O3 nanowire sensor towards acetone gas is discussed. (C) 2015 Elsevier B.V. All rights reserved.