A dimethyl disulfide gas sensor based on nanosized Pt-loaded tetrakaidecahedral α-Fe2O3nanocrystals

Ziqin Zhuang; Li Zhang; Chaozhu Huang; Xiaohang Wang; Haichuan Guo; Tiju Thomas; Fengdong Qu; Pei Wang; Minghui Yang

doi:10.1088/1361-6528/ac614c

A dimethyl disulfide gas sensor based on nanosized Pt-loaded tetrakaidecahedral α-Fe₂O₃nanocrystals

Nanotechnology. 2022 Jul 15;33(40). doi: 10.1088/1361-6528/ac614c.

Authors

Ziqin Zhuang¹, Li Zhang², Chaozhu Huang², Xiaohang Wang², Haichuan Guo², Tiju Thomas³, Fengdong Qu², Pei Wang¹, Minghui Yang²

Affiliations

¹ Materials Science and Engineering Department, Dalian Maritime University, Dalian, 116026, People's Republic of China.
² Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
³ Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Adyar, Chennai-600036, Tamil Nadu, India.

PMID: 35334476
DOI: 10.1088/1361-6528/ac614c

Abstract

Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pureα-Fe₂O₃nanoparticles and Pt-modifiedα-Fe₂O₃nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the originalα-Fe₂O₃nanomaterials, the Pt-α-Fe₂O₃nanocomposite 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-Fe₂O₃nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.

Keywords: Fe2O3; Pt-modification; chemiresistor sensor; dimethyl disulfide.