Lim Hyeongtae, Kwon Hyeokjin, Kang Hongki, Jang Jae Eun, Kwon Hyuk-Jun
Department of Electrical Engineering and Computer Science, DGIST, Daegu, 42988, South Korea.
Convergence Research Advanced Centre for Olfaction, DGIST, Daegu, 42988, South Korea.
Nanomicro Lett. 2024 Feb 9;16(1):113. doi: 10.1007/s40820-024-01332-5.
Advancements in sensor technology have significantly enhanced atmospheric monitoring. Notably, metal oxide and carbon (MO/C) hybrids have gained attention for their exceptional sensitivity and room-temperature sensing performance. However, previous methods of synthesizing MO/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/C structures. The laser processing facilitates precise micropatterning (< 2 μm, comparable to typical photolithography) of the MO/C crystals. The optimized MOF-derived MO/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.
传感器技术的进步显著提升了大气监测水平。值得注意的是，金属氧化物与碳（MO/C）复合材料因其卓越的灵敏度和室温传感性能而受到关注。然而，以往合成MO/C复合材料的方法存在诸如不均匀性、团聚以及微图案化方面的挑战等问题。在此，我们介绍一种改进方法，该方法采用金属有机框架（MOF）作为前驱体并结合直接激光写入技术。MOF的固有结构确保了金属离子和有机连接体的均匀分布，从而产生均匀的MO/C结构。激光加工有助于对MO/C晶体进行精确的微图案化（<2μm，与典型光刻技术相当）。优化后的源自MOF的MO/C传感器即使在室温下也能快速检测乙醇气体（响应和恢复时间分别为105秒和18秒），传感性能范围宽广，从170至3400ppm，响应值高达3500%。此外，与以往基于MOF的同类传感器相比，该传感器展现出更高的稳定性和热弹性。这项研究为源自MOF的传感装置的实际应用开辟了广阔前景。
