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Title: Metallic Ti 3C 2T x MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio

Abstract

Achieving high sensitivity in solid-state gas sensors can allow the precise detection of chemical agents. In particular, detection of volatile organic compounds (VOCs) at the parts per billion (ppb) level is critical for the early diagnosis of diseases. To obtain high sensitivity, two requirements need to be simultaneously satisfied: (i) low electrical noise and (ii) strong signal, which existing sensor materials cannot meet. Here, we demonstrate that 2D metal carbide MXenes, which possess high metallic conductivity for low noise and a fully functionalized surface for a strong signal, greatly outperform the sensitivity of conventional semiconductor channel materials. Ti 3C 2T x MXene gas sensors exhibited a very low limit of detection of 50–100 ppb for VOC gases at room temperature. Also, the extremely low noise led to a signal-to-noise ratio 2 orders of magnitude higher than that of other 2D materials, surpassing the best sensors known. Furthermore, our results provide insight in utilizing highly functionalized metallic sensing channels for developing highly sensitive sensors.

Authors:
 [1];  [1];  [2];  [3]; ORCiD logo [2];  [1]; ORCiD logo [2];  [4]; ORCiD logo [4];  [5]; ORCiD logo [2]; ORCiD logo [6]
  1. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (Korea). National Research Lab. for Organic Optoelectronic Materials
  2. Drexel Univ., Philadelphia, PA (United States). A.J. Drexel Nanomaterials Institute
  3. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (Korea). Dept. of Chemical and Biomolecular Engineering (BK-21 Plus)
  4. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (Korea). School of Electrical Engineering
  5. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (Korea). Dept. of Chemical and Biomolecular Engineering (BK-21 Plus) and KAIST Inst. for Nanocentury
  6. Korea Advanced Institute of Science and Technology (KAIST), Daejeon (Korea). National Research Lab. for Organic Optoelectronic Materials and KAIST Inst. for Nanocentury
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1488925
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 12; Journal Issue: 2; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; gas sensing; metallic channel; MXene; signal-to-noise ratio; titanium carbide; two-dimensional materials; volatile organic compound

Citation Formats

Kim, Seon Joon, Koh, Hyeong -Jun, Ren, Chang E., Kwon, Ohmin, Maleski, Kathleen, Cho, Soo -Yeon, Anasori, Babak, Kim, Choong -Ki, Choi, Yang -Kyu, Kim, Jihan, Gogotsi, Yury, and Jung, Hee -Tae. Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio. United States: N. p., 2018. Web. doi:10.1021/acsnano.7b07460.
Kim, Seon Joon, Koh, Hyeong -Jun, Ren, Chang E., Kwon, Ohmin, Maleski, Kathleen, Cho, Soo -Yeon, Anasori, Babak, Kim, Choong -Ki, Choi, Yang -Kyu, Kim, Jihan, Gogotsi, Yury, & Jung, Hee -Tae. Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio. United States. doi:10.1021/acsnano.7b07460.
Kim, Seon Joon, Koh, Hyeong -Jun, Ren, Chang E., Kwon, Ohmin, Maleski, Kathleen, Cho, Soo -Yeon, Anasori, Babak, Kim, Choong -Ki, Choi, Yang -Kyu, Kim, Jihan, Gogotsi, Yury, and Jung, Hee -Tae. Thu . "Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio". United States. doi:10.1021/acsnano.7b07460. https://www.osti.gov/servlets/purl/1488925.
@article{osti_1488925,
title = {Metallic Ti3C2Tx MXene Gas Sensors with Ultrahigh Signal-to-Noise Ratio},
author = {Kim, Seon Joon and Koh, Hyeong -Jun and Ren, Chang E. and Kwon, Ohmin and Maleski, Kathleen and Cho, Soo -Yeon and Anasori, Babak and Kim, Choong -Ki and Choi, Yang -Kyu and Kim, Jihan and Gogotsi, Yury and Jung, Hee -Tae},
abstractNote = {Achieving high sensitivity in solid-state gas sensors can allow the precise detection of chemical agents. In particular, detection of volatile organic compounds (VOCs) at the parts per billion (ppb) level is critical for the early diagnosis of diseases. To obtain high sensitivity, two requirements need to be simultaneously satisfied: (i) low electrical noise and (ii) strong signal, which existing sensor materials cannot meet. Here, we demonstrate that 2D metal carbide MXenes, which possess high metallic conductivity for low noise and a fully functionalized surface for a strong signal, greatly outperform the sensitivity of conventional semiconductor channel materials. Ti3C2Tx MXene gas sensors exhibited a very low limit of detection of 50–100 ppb for VOC gases at room temperature. Also, the extremely low noise led to a signal-to-noise ratio 2 orders of magnitude higher than that of other 2D materials, surpassing the best sensors known. Furthermore, our results provide insight in utilizing highly functionalized metallic sensing channels for developing highly sensitive sensors.},
doi = {10.1021/acsnano.7b07460},
journal = {ACS Nano},
number = 2,
volume = 12,
place = {United States},
year = {2018},
month = {1}
}

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