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Updated: Jan 3, 2026

Luminescence Lifetime Imaging of O2 with a Frequency-Domain-Based Camera System
Published on: December 16, 2019
Oxygen-Sensitive Layered MoTe2 Channels for Environmental Detection
Shih-Hsien Yang1, Che-Yi Lin2, Yuan-Ming Chang
1International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics , Shenzhen University , Shenzhen 518060 , China.
Multilayered molybdenum ditelluride (MoTe2) channels show resistance changes with oxygen (O2) levels. Joule heating enables repeatable oxygen detection, indicating MoTe2
Area of Science:
- Materials Science
- Nanoscience
- Chemical Sensing
Background:
- Molybdenum ditelluride (MoTe2) is a layered material with unique electronic properties.
- Oxygen (O2) significantly influences the electrical characteristics of semiconductor materials.
- Understanding O2 interactions is crucial for developing novel electronic devices and sensors.
Purpose of the Study:
- To investigate the oxygen-dependent resistance changes in multilayered MoTe2 channels.
- To explore the potential of MoTe2 field-effect transistors for oxygen sensing applications.
- To characterize the effect of Joule heating on oxygen interaction with MoTe2.
Main Methods:
- Fabrication and characterization of multilayered MoTe2 field-effect transistors.
- Measurement of channel resistance variations in response to different oxygen concentrations.
- Application of Joule heating to induce and study oxygen desorption and re-adsorption.
Main Results:
- A reproducible 'O2 index' based on channel resistance was established to quantify relative oxygen content.
- Joule heating drastically reduced the O2 index from 100% to 12.1% in back gate modulation.
- Effective oxygen desorption from the MoTe2 surface was observed due to Joule heating, enabling repeatable detection.
Conclusions:
- Multilayered MoTe2 channels exhibit significant oxygen-dependent electrical properties.
- Joule heating facilitates reversible oxygen interaction, crucial for sensor reset and reusability.
- MoTe2 channels show promise as a viable material for environmental oxygen sensing.
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