A Liquid Metal Balloon for the Exfoliation of an Ultrathin and Uniform Gallium Oxide Layer
We report the exfoliation of ultrathin gallium oxide (Ga<sub>2</sub>O<sub>3</sub>) films from liquid metal balloons, formed by injecting air into droplets of eutectic gallium-indium alloy (eGaIn). These Ga<sub>2</sub>O<sub>3</sub> films enable the selective adsorption of carbon nanotubes (CNTs) dispersed in water, resulting in the formation of a dense, percolating CNT network on their surface. The self-assembled CNT network on Ga<sub>2</sub>O<sub>3</sub> provides a versatile platform for device fabrication. As an example application, we fabricated a chemiresistive gas sensor for detecting simulants of chemical warfare agents (CWAs), including diisopropyl methylphosphonate (DIMP), dimethyl methylphosphonate (DMMP), and triethyl phosphate (TEP). The sensor exhibited reversible responses, high sensitivity, and low limits of detection (13 ppb for DIMP, 28 ppb for DMMP, and 53 ppb for TEP). These findings highlight the potential of Ga<sub>2</sub>O<sub>3</sub> films derived from liquid metal balloons for integrating CNTs into functional electronic devices.
Authors
- Chang Young Lee (ORCID: https://orcid.org/0000-0002-2757-8019)
- Anar Zhexembekova (ORCID: https://orcid.org/0000-0002-3361-1663)
- Yun-Tae Kim (ORCID: https://orcid.org/0000-0002-9313-976X)
- Seongyeop Lim (ORCID: https://orcid.org/0009-0006-8799-9284)
- Cheongha Lee
Institutions
- Ulsan National Institute of Science and Technology (KR)
Publication Details
- Journal
- Molecules
- Published
- 2024-12-13
- DOI
- https://doi.org/10.3390/molecules29245894
- Citations
- 2
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 0.42
Funders
- National Research Foundation
- Ulsan National Institute of Science and Technology
- Ministry of Trade, Industry and Energy
- National Research Foundation of Korea
- Ministry of Education, Science and Technology