| Autor: |
Fukui A; Department of Physics and Electronics, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Matsuyama K; Department of Physics and Electronics, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan.; Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan., Onoe H; Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan., Itai S; Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan., Ikeno H; Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Hiraoka S; Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Hiura K; Department of Materials Science, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Hijikata Y; Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan., Pirillo J; Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan., Nagata T; Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan., Takei K; Department of Physics and Electronics, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Yoshimura T; Department of Physics and Electronics, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Fujimura N; Department of Physics and Electronics, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan., Kiriya D; Department of Physics and Electronics, Osaka Metropolitan University, Sakai, Osaka 599-8531, Japan.; Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan. |
| Abstrakt: |
N , N -Dimethylformamide (DMF) is an essential solvent in industries and pharmaceutics. Its market size range was estimated to be 2 billion U.S. dollars in 2022. Monitoring DMF in solution environments in real time is significant because of its toxicity. However, DMF is not a redox-active molecule; therefore, selective monitoring of DMF in solutions, especially in polar aqueous solutions, in real time is extremely difficult. In this paper, we propose a selective DMF sensor using a molybdenum disulfide (MoS 2 ) field-effect transistor (FET). The sensor responds to DMF molecules but not to similar molecules of formamide, N , N -diethylformamide, and N , N -dimethylacetamide. The plausible atomic mechanism is the oxygen substitution sites on MoS 2 , on which the DMF molecule shows an exceptional orientation. The thin structure of MoS 2 -FET can be incorporated into a microfluidic chamber, which leads to DMF monitoring in real time by exchanging solutions subsequently. The designed device shows DMF monitoring in NaCl ionic solutions from 1 to 200 μL/mL. This work proposes the concept of selectively monitoring redox-inactive molecules based on the nonideal atomic affinity site on the surface of two-dimensional semiconductors. |
