The typical methods used to improve the sensing properties of metal oxide nanowire-based gas sensors include decoration of a metal catalyst on the surface of nanowires or generation of surface defects. In this study, we suggest a process for preparing a Pd metal catalyst surrounded in SnO2-x with a large number of structural defects on the surface of SnO2 nanowires for gas sensing applications. Initially, SnO2 nanowires were prepared using a simple vapor-liquid-solid method and Pd-embedded SnO2-x-decoration was achieved by flame chemical vapor deposition. Gas sensing studies demonstrated the promising effects of Pd-embedded SnO2-x-decoration. The underlying sensing mechanism was studied in detail and explained in terms of generation of oxygen defects, catalytic activity of Pd, and formation of heterojunctions in the sensing material. The results of the present study clearly demonstrate the usefulness of this simple and fast approach to significantly enhance the gas sensing properties of metal oxide nanowires.
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2020R1I1A1A01067785 and NRF-2020R1I1A1A01067825 ). This research was also supported by the Korea Initiative for fostering the University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF) funded by the Korean government (MSIT) ( NRF-2020M3H1A1077207 ). This study was supported by 2017 Research Grant from Kangwon National University . We are grateful to Jiye Kim, Mun Young Koh, Bomi Kim, Baro Jin, Ha Jin Na, and Koh Eun Na for their cordiality and hospitality during the course of this research.
© 2021 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry