Green Light-Driven Ultraselective Trimethylamine Detection Using In<sub>2</sub>S<sub>3</sub> Nanoflakes at Room Temperature for Fish Quality Monitoring
Visible light-activated chemoresistive gas sensors offer low power consumption, room-temperature operation, minimal material degradation, and human safety. While extensive research has focused on NO<sub>2</sub> detection due to its high electron affinity, detecting volatile organic compounds or amine gases by light activation remains challenging because of the high activation energy required for interactions with sensing materials. Here, we report the first demonstration of green-light-activated trimethylamine (TMA) detection using β-In<sub>2</sub>S<sub>3</sub> nanoflakes (NFs) corresponding to the bandgap energy of green wavelength. Photoabsorbed β-In<sub>2</sub>S<sub>3</sub> NFs exhibit a TMA response 55 times greater than that in dark condition, with a rapid detection and ultrahigh selectivity. Density functional theory calculations highlight the role of the intrinsic defective structure of β-In<sub>2</sub>S<sub>3</sub> in gas interactions. The β-In<sub>2</sub>S<sub>3</sub> sensors were successfully applied for real-time fish quality monitoring under humid room-temperature conditions. Our findings provide a material strategy that achieves selective detection of specific gas molecules under wavelength-controlled light activation.
Authors
- Hyuk Jin Kim (ORCID: https://orcid.org/0000-0003-4620-9443)
- Ho Won Jang (ORCID: https://orcid.org/0000-0002-6952-7359)
- Cheon Woo Moon (ORCID: https://orcid.org/0000-0001-8819-9613)
- Jung‐El Ryu (ORCID: https://orcid.org/0000-0002-1795-827X)
- Tae Hoon Eom
- Mi‐Hwa Oh (ORCID: https://orcid.org/0000-0001-7838-5260)
- Sungkyun Choi (ORCID: https://orcid.org/0000-0002-8267-8581)
- SeonJu Park (ORCID: https://orcid.org/0000-0002-0532-5977)
- Yongjo Park (ORCID: https://orcid.org/0000-0002-7165-8745)
- Gi Baek Nam
- Hyeon Ji Lee (ORCID: https://orcid.org/0009-0002-3299-4604)
- Sohyeon Park (ORCID: https://orcid.org/0000-0002-5171-0083)
- Soo Min Lee
- Sung Hyuk Park (ORCID: https://orcid.org/0000-0002-2473-4223)
- Sung Hwan Cho (ORCID: https://orcid.org/0000-0003-0634-1052)
- Seung Won Choi
- Jin Wook Yang (ORCID: https://orcid.org/0000-0002-6847-8073)
- Yeong Jae Kim
- Seung Ju Kim
Institutions
- University of Southern California (US)
- Seoul National University (KR)
- Minghsin University of Science and Technology (TW)
- Inha University (KR)
- Soonchunhyang University (KR)
- Rural Development Administration (KR)
- California Southern University (US)
- Japan Display (Japan) (JP)
- University of California System (US)
- Institute of Electronics (BG)
- Advanced Institute of Convergence Technology (KR)
- National Institute of Animal Science (KR)
- Division of Materials Science and Engineering (AU)
- Bioengineering Center (RU)
- Massachusetts Institute of Technology (US)
- University of California, Berkeley (US)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-07-14
- DOI
- https://doi.org/10.1021/acs.nanolett.5c02819
- Citations
- 3
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 2.19