Gd-modified In2O3 for the enhanced xylene sensing

Abstract

Modifying with rare earth elements has been proven to be an effective means of enhancing the gassensing properties of oxides. In this work,Gd-In 2 O 3 based sensor was developed, which showed high response to 100 ppm xylene gas (Ra/Rg = 17.8) fast response time (11 s) at 350°C, this response value was 5.4 times higher compared to the unmodi ed In 2 O 3 sensor (Ra/Rg = 3.3). The introduction of the rare earth element not only improves the electrical properties of the sensitive material to provide a more suitable resistance, but also strengthens the gas adsorption ability and the catalytic effect on the surface of the sensitive material, leading to the enhanced sensing performance.