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Electrical response of tungsten diselenide to the adsorption of trinitrotoluene molecules

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2023, 33(6), pp.255-260
  • DOI : 10.6111/JKCGCT.2023.33.6.255
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : October 23, 2023
  • Accepted : November 10, 2023
  • Published : December 31, 2023

Chan Hwi Kim 1 Suyeon Cho 2 Hyeongtae Kim 3 Wonjoo Lee 4 Park, Jun Hong 5

1한국산업기술시험원 항공국방신뢰성센터
2경상국립대학교 나노신소재공학부
3경상국립대학교 나노신소재융합공학과
4한국산업기술시험원
5경상국립대학교

Accredited

ABSTRACT

As demanding the detection of explosive molecules, it is required to develop rapidly and precisely responsivesensors with ultra-high sensitivity. Since two-dimensional semiconductors have an atomically thin body nature where mobilecarriers accumulate, the abrupt modulation carrier in the thin body channel can be expected. To investigate the effectivenessof WSe2 semiconductor materials as a detection material for TNT (Trinitrotoluene) explosives, WSe2 was synthesized using thermal chemical vapor deposition, and afterward, WSe2 FETs (Field Effect Transistors) were fabricated using standard photo-lithograph processes. Raman Spectrum and FT-IR (Fourier-transform infrared) spectroscopy reveal that the adsorption of TNT molecules induces the structural transition of WSe2 crystalline. The electrical properties before and after adsorption of TNT molecules on the WSe2 surface were compared; as 50 V was applied as the back gate bias, 0.02 A was recorded in the bare state, and the drain current increased to 0.41 A with a dropping 0.6% (w/v) TNT while maintaining the p-type behavior. Afterward, the electrical characteristics were additionally evaluated by comparing the carrier mobility, hysteresis, and on/off ratio. Consequently, the present report provides the milestone for developing ultra-sensitive sensors with rapid response and high precision.

Citation status

* References for papers published after 2023 are currently being built.

This paper was written with support from the National Research Foundation of Korea.