Laser-Induced and MOF-Derived Metal Oxide/Carbon Composite for Synergistically Improved Ethanol Sensing at Room temperature
Hyeongtae Lim, Hyeok‐jin Kwon, Hongki Kang, Jae Eun Jang, Hyuk‐Jun Kwon, Hyuk‐Jun Kwon, Hyuk‐Jun Kwon
Abstract
Abstract Advancements in sensor technology have significantly enhanced atmospheric monitoring. Notably, metal oxide and carbon (MO x /C) hybrids have gained attention for their exceptional sensitivity and room-temperature sensing performance. However, previous methods of synthesizing MO x /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 MO x /C structures. The laser processing facilitates precise micropatterning (< 2 μm, comparable to typical photolithography) of the MO x /C crystals. The optimized MOF-derived MO x /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.