Electrothermally induced highly responsive and highly selective vanadium oxide hydrogen sensor based on metal-insulator transition
- 등재 SCIE, SCOPUS
- 발행기관 American Chemical Society
- 발행년도 2012
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000093139
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/jp2080989
초록/요약
We report highly effective hydrogen gas detection based on the metal-insulator transition (MIT) by the electrothermally induced Pd-nanoparticles-decorated vanadium oxide (VO 2) nanowire prepared by the efficient and size-controllable growth method originating from V 2O 5 thin film driven by supercooled liquid nanodroplets. By irradiating a well-defined electron beam into the nanowires, we could significantly increase the conductivity up to four times with only a modest change in the semiconductor-to-metal transition temperature (<2 °C). When exposed to trace amounts of hydrogen gas in a single nanowire configuration, the enhanced conductivity gave rise to about a two times as fast transition to metallic phase even near room temperature (∼35 °C), by reaching much faster (∼3×) a critical current density at which the self-heating initiates. Consequently, we achieved the greatly shorter response time as well as lower operating temperature and voltage for the detection of hydrogen gas in a single VO 2 nanowire device, which can be attributed to the self-heating effect accelerated by the increase in the conductivity. The single nanowire sensor also shows the capability of detecting selectively hydrogen of different three gases (O 2, CO, and ethylene). © 2011 American Chemical Society.
more