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UV-Activated MoS2 Based Fast and Reversible NO2 Sensor at Room Temperature.

Rahul Kumar1, Neeraj Goel1, Mahesh Kumar1

  • 1Department of Electrical Engineering, Indian Institute of Technology Jodhpur , Jodhpur-342011, India.

ACS Sensors
|November 2, 2017
PubMed
Summary

This study presents a novel molybdenum disulfide (MoS2) gas sensor for ultrafast and reversible detection of nitrogen dioxide (NO2) at room temperature. Photoexcitation significantly enhances sensor performance, enabling low-power, portable gas sensing applications.

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Two-dimensional materials offer high surface-to-volume ratios for chemical sensing.
  • Limitations in response time and recovery hinder practical gas sensor applications at room temperature.

Purpose of the Study:

  • To develop an ultrafast and reversible gas sensor using molybdenum disulfide (MoS2) at room temperature.
  • To investigate the effect of thermal and photo energy on MoS2 sensor performance for nitrogen dioxide (NO2) detection.

Main Methods:

  • Fabrication of a MoS2-based gas sensor.
  • Testing sensor response and recovery to NO2 under room temperature, thermal, and photoexcitation conditions.
  • Analyzing sensor selectivity against various gases.
Keywords:
2D MoS2CVDNO2gas sensorphoto excitationselectivity

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Main Results:

  • At room temperature, the MoS2 sensor showed slow response (~249 s) and incomplete recovery to NO2.
  • Thermal energy improved recovery but reduced sensitivity.
  • Photoexcitation resulted in ultrafast response (~29 s) and excellent recovery, with a ~30% sensitivity enhancement.
  • The sensor demonstrated reliable selectivity for NO2.

Conclusions:

  • Optical illumination significantly improves MoS2 gas sensor performance at room temperature.
  • MoS2 shows potential for developing low-power, portable gas sensors with enhanced sensitivity and response time.
  • Charge perturbation under optical illumination is key to improved NO2/MoS2 interaction.