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High-Performance Gas Sensor Using a Large-Area WS

Kyung Yong Ko1, Sangyoon Lee1, Kyunam Park1

  • 1School of Electrical and Electronic Engineering , Yonsei University , 50 Yonsei-Ro , Seodaemun-Gu, Seoul 03722 , Republic of Korea.

ACS Applied Materials & Interfaces
|September 18, 2018
PubMed
Summary
This summary is machine-generated.

Large-area tungsten disulfide selenide (WS2xSe2-2x) alloy gas sensors show enhanced room-temperature nitrogen dioxide (NO2) detection. This advancement offers a promising strategy for developing low-power, wearable gas-sensing devices.

Keywords:
electronic sensitizationgas sensorslow-power operationtransition-metal dichalcogenide alloywearable application

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) are promising for gas sensors due to excellent electrical properties, flexibility, and low power needs.
  • While TMDCs like MoS2, MoSe2, WS2, and WSe2 show good gas-sensing, enhancing their performance requires further research.
  • The large surface-to-volume ratio of 2D TMDCs is key to their sensing capabilities.

Purpose of the Study:

  • To synthesize large-area uniform WS2xSe2-2x alloys for room-temperature gas sensors.
  • To investigate the enhancement of gas-sensing performance using these novel alloys.
  • To demonstrate a practical application in a low-power wearable gas detection device.

Main Methods:

  • Synthesis of large-area uniform WS2xSe2-2x alloys via a thermodynamically stable sulfurization process.
  • Fabrication of gas sensors using the synthesized WS2xSe2-2x alloys.
  • Testing the NO2-sensing performance of the fabricated sensors at room temperature.

Main Results:

  • The WS2xSe2-2x alloys exhibited controlled composition and uniform large-area synthesis.
  • Gas sensors made from WS2xSe2-2x alloys showed improved NO2-sensing performance compared to WSe2.
  • The WS0.96Se1.04 alloy sensor demonstrated a 2.4-fold increase in response to NO2.
  • A low-power, wearable NO2-detecting wristband operating at room temperature was successfully demonstrated.

Conclusions:

  • The developed WS2xSe2-2x alloys offer a promising strategy for enhancing 2D TMDC gas sensors.
  • The findings suggest potential applications in advanced, low-power, room-temperature gas-sensing devices.
  • This work paves the way for improved wearable and portable gas detection technologies.