A dimethyl disulfide gas sensor based on nanosized Pt-loaded tetrakaidecahedral <i>α</i> -Fe <sub>2</sub> O <sub>3</sub> nanocrystals
Ziqin Zhuang, Li Zhang, Chaozhu Huang, Xiaohang Wang, Haichuan Guo, Tiju Thomas, Fengdong Qu, Pei Wang, Minghui Yang
Abstract
Abstract Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pure α -Fe 2 O 3 nanoparticles and Pt-modified α -Fe 2 O 3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α -Fe 2 O 3 nanomaterials, the Pt- α -Fe 2 O 3 nanocomposite sensor shows a higher response value ( R a / R g = 58.6) and a shorter response/recovery time (1 s/168 s) to 100 ppm dimethyl disulfide (DMDS) gas at 375 °C. In addition, it has better selectivity to DMDS gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt- α -Fe 2 O 3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.