Oxygen-Sensitive Layered MoTe2 Channels for Environmental Detection

Shih-Hsien Yang; Che-Yi Lin; Yuan-Ming Chang; Mengjiao Li; Ko-Chun Lee; Ciao-Fen Chen; Feng-Shou Yang; Chen-Hsin Lien; Keiji Ueno; Kenji Watanabe; Takashi Taniguchi; Kazuhito Tsukagoshi; Yen-Fu Lin

doi:10.1021/acsami.9b15036

Oxygen-Sensitive Layered MoTe₂ Channels for Environmental Detection

ACS Appl Mater Interfaces. 2019 Dec 18;11(50):47047-47053. doi: 10.1021/acsami.9b15036. Epub 2019 Dec 4.

Authors

Shih-Hsien Yang¹, Che-Yi Lin², Yuan-Ming Chang, Mengjiao Li, Ko-Chun Lee³, Ciao-Fen Chen, Feng-Shou Yang³, Chen-Hsin Lien³, Keiji Ueno⁴, Kenji Watanabe, Takashi Taniguchi, Kazuhito Tsukagoshi, Yen-Fu Lin

Affiliations

¹ International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics , Shenzhen University , Shenzhen 518060 , China.
² Department of Electrophysics , National Chiao Tung University , Hsinchu 30010 , Taiwan.
³ Department of Electrical Engineering and Institute of Electronic Engineering , National Tsing Hua University , Hsinchu 30010 , Taiwan.
⁴ Department of Chemistry, Graduate School of Science and Engineering , Saitama University , Saitama 338-8570 , Japan.

PMID: 31746187
DOI: 10.1021/acsami.9b15036

Abstract

The oxygen (O₂)-dependent resistance change of multilayered molybdenum ditelluride (MoTe₂) channels was characterized. A variation of the channel resistance could reproducibly determine relative O₂ content (denoted as the O₂ index). We found that Joule heating in a layered MoTe₂ field-effect transistor caused the O₂ index to decrease drastically from 100 to 12.1% in back gate modulation. Furthermore, Joule heating caused effective O₂ desorption from the MoTe₂ surface and repeatable O₂ detection by multilayered MoTe₂ channels was realized. This work not only explored the influence of O₂ on the electrical properties of multilayered MoTe₂ channels but also revealed that MoTe₂ channels are promising for sensing O₂ in an environmental condition.

Keywords: MoTe2; O2 index; layered electronics; oxygen detection; repeatable.