Journal article
N–p-Conductor Transition of Gas Sensing Behaviors in Mo 2 CT x MXene
ACS sensors, v 7(8), pp 2225-2234
26 Aug 2022
Abstract
It is highly important to implement various semiconducting, such as n- or p-type, or conducting types of sensing behaviors to maximize the selectivity of gas sensors. To achieve this, researchers so far have utilized the n-p (or p-n) two-phase transition using doping techniques, where the addition of an extra transition phase provides the potential to greatly increase the sensing performance. Here, we report for the first time on an n-p-conductor three-phase transition of gas sensing behavior using Mo2CTx MXene, where the presence of organic intercalants and film thickness play a critical role. We found that 5-nm-thick Mo2CTx films with a tetramethylammonium hydroxide (TMAOH) intercalant displayed a p-type gas sensing response, while the films without the intercalant displayed a clear n-type response. Additionally, Mo2CTx films with thicknesses over 700 nm exhibited a conductor-type response, unlike the thinner films. It is expected that the three-phase transition was possible due to the unique and simultaneous presence of the intrinsic metallic conductivity and the high-density of surface functional groups of the MXene. We demonstrate that the gas response of Mo2CTx films containing tetramethylammonium (TMA) ions toward volatile organic compounds (VOCs), NH3, and NO2 is ∼30 times higher than that of deintercalated films, further showing the influence of intercalants on sensing performance. Also, DFT calculations show that the adsorption energy of NH3 and NO2 on Mo2CTx shifts from -0.973, -1.838 eV to -1.305, -2.750 eV, respectively, after TMA adsorption, demonstrating the influence of TMA in enhancing sensing performance.
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Details
- Title
- N–p-Conductor Transition of Gas Sensing Behaviors in Mo 2 CT x MXene
- Creators
- Junghoon Choi - Korea Advanced Institute of Science and TechnologyBenjamin Chacon - Drexel UniversityHyunsoo Park - Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaKanit Hantanasirisakul - A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia PA 19104, United StatesTaewoo Kim - Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaKateryna Shevchuk - Drexel UniversityJuyun Lee - Korea Institute of Science and TechnologyHohyung Kang - Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaSoo-Yeon Cho - School of Chemical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Suwon 16419, Republic of KoreaJihan Kim - Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of KoreaYury Gogotsi - Drexel University, Materials Science and EngineeringSeon Joon Kim - Korea Institute of Science and TechnologyHee-Tae Jung - Korea Advanced Institute of Science and Technology
- Publication Details
- ACS sensors, v 7(8), pp 2225-2234
- Publisher
- AMER CHEMICAL SOC
- Number of pages
- 10
- Grant note
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT (MSIT): 2021M3H4A1A03047335, 2021R1C1C1006385, 2021M3H4A1A03047327 KIST internal research programs - Korea Institute of Science and Technology (KIST)National Research Council of Science AMP; Technology (NST)Korea government (MSIT): CRC22031-000 Global Research and Development Center Program(NNFC-Drexel-SMU FIRST Nano Co-op Centre): 2015K1A4A3047100
This research was supported by a National Research Foundation of Korea (NRF) grant (2021M3H4A1A03047335, 2021R1C1C1006385, 2021M3H4A1A03047327) funded by the Ministry of Science and ICT (MSIT) , as well as the KIST internal research programs funded by the Korea Institute of Science and Technology (KIST). This research was also supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) (CRC22031-000) and the Global Research and Development Center Program (NNFC-Drexel-SMU FIRST Nano Co-op Centre, 2015K1A4A3047100). The authors acknowledge Dr. Yonghee Lee and Dr. Chi Won Ahn of NNFC for helping with the MXene synthesis and Dr. Babak Anasori and Dr. Tyler Mathis for helping with the Mo 2 Ga 2 C MAX synthesis. The authors also acknowledge Dr. Kathleen Maleski for helpful discussions.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; A.J. Drexel Nanomaterials Institute
- Web of Science ID
- WOS:000830503100001
- Scopus ID
- 2-s2.0-85135784903
- Other Identifier
- 991021811616704721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Analytical
- Chemistry, Multidisciplinary
- Nanoscience & Nanotechnology