Nano-Micro Letters ›› 2024, Vol. 16 ›› Issue (1): 113-. doi: 10.1007/s40820-024-01332-5

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Laser-Induced and MOF-Derived Metal Oxide/Carbon Composite for Synergistically Improved Ethanol Sensing at Room temperature

Hyeongtae Lim1,2, Hyeokjin Kwon1,2, Hongki Kang1, Jae Eun Jang1, Hyuk-Jun Kwon1,2()   

  1. 1 Department of Electrical Engineering and Computer Science, DGIST, Daegu, 42988, South Korea
    2 Convergence Research Advanced Centre for Olfaction, DGIST, Daegu, 42988, South Korea
  • Received:2023-09-24 Accepted:2023-12-26 Online:2024-01-01 Published:2024-02-09
  • Contact: Hyuk-Jun Kwon

Abstract:

Advancements in sensor technology have significantly enhanced atmospheric monitoring. Notably, metal oxide and carbon (MOx/C) hybrids have gained attention for their exceptional sensitivity and room-temperature sensing performance. However, previous methods of synthesizing MOx/C composites suffer from problems, including inhomogeneity, aggregation, and challenges in micropatterning. Herein, we introduce a refined method that employs a metal-organic framework (MOF) as a precursor combined with direct laser writing. The inherent structure of MOFs ensures a uniform distribution of metal ions and organic linkers, yielding homogeneous MOx/C structures. The laser processing facilitates precise micropatterning (< 2 μm, comparable to typical photolithography) of the MOx/C crystals. The optimized MOF-derived MOx/C sensor rapidly detected ethanol gas even at room temperature (105 and 18 s for response and recovery, respectively), with a broad range of sensing performance from 170 to 3,400 ppm and a high response value of up to 3,500%. Additionally, this sensor exhibited enhanced stability and thermal resilience compared to previous MOF-based counterparts. This research opens up promising avenues for practical applications in MOF-derived sensing devices.

Key words: Metal-organic frameworks, Metal oxide, Carbon composite, Laser, Gas sensor