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Title: Monolayer Sc2CF2 as a Potential Selective and Sensitive NO2 Sensor: Insight from First-Principles Calculations

Journal Article · · ACS Omega
 [1];  [2];  [2];  [3];  [2]; ORCiD logo [4]; ORCiD logo [3]
  1. Xi’an University of Posts and Telecommunications (China); Rensselaer Polytechnic Institute, Troy, NY (United States)
  2. Xi’an University of Posts and Telecommunications (China)
  3. Dalian University of Technology (China)
  4. Rensselaer Polytechnic Institute, Troy, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Two-dimensional materials with excellent surface–volume ratios and massive reaction sites recently have been receiving attention for gas sensing. With first-principles calculations, we explored the performance of monolayer Sc2CF2 as a gas sensor. We investigated how molecule adsorption affects its electronic structure and optical properties. It is found that a large charge transfer quantity happens between Sc2CF2 and NO2, which results from the fact that the lowest unoccupied molecular orbital (LUMO) of NO2 is below the valence band maximum (VBM) of Sc2CF2. Moreover, the MD simulation shows that NO2 can adsorb on the Sc2CF2 surface stably at room temperature. We explored the effect of biaxial strain on the adsorption energy and charge transfer quantity of each system, and the results show that the biaxial strain can enhance both the adsorption energy and charge transfer quantity of the NO2 system and thus can improve the sensitivity of Sc2CF2 in detecting the NO2 molecule. Furthermore, we investigated the adsorption behavior and charge transfer of polar polyatomic molecules at the Sc2CF2 surface with h-BN as a substrate, and the results demonstrate that the h-BN substrate can hardly modify the main results. Our result predicts that Sc2CF2 can be a promising selective and sensitive sensor to detect the NO2 molecule, and could also give a theoretical guide for other terminated MXenes used for gas sensors or detectors.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2470873
Journal Information:
ACS Omega, Journal Name: ACS Omega Journal Issue: 11 Vol. 7; ISSN 2470-1343
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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