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Fast-Response, Sensitivitive and Low-Powered Chemosensors by Fusing Nanostructured Porous Thin Film and IDEs-Microheater Chip
Author: Zhengfei Dai, Lei Xu, Guotao Duan,Tie Li, Hongwen Zhang, Yue Li, Yi Wang, Yuelin Wang, Weiping Cai
Periodical: Scientific Reports
Page: 2013, 3: 1669
Full text link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3628220/
Periodical: Scientific Reports
Page: 2013, 3: 1669
Full text link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3628220/
The chemiresistive thin film gas sensors with fast response, high sensitivity, low power consumption and mass-produced potency, have been expected for practical application. It requires both sensitive materials, especially exquisite nanomaterials, and efficient substrate chip for heating and electrical addressing. However, it is challenging to achieve repeatable microstructures across the films and low power consumption of substrate chip. Here we presented a new sensor structure via the fusion of metal-oxide nanoporous films and micro-electro-mechanical systems (MEMS)-based sensing chip. An interdigital-electrodes (IDEs) and microheater integrated MEMS structure is designed and employed as substrate chip to in-situ fabricate colloidal monolayer template-induced metal-oxide (egg. SnO2) nanoporous sensing films. This fused sensor demonstrates mW-level low power, ultrafast response (~1 s), and parts-per-billion lever detection for ethanol gas. Due to the controllable template strategy and mass-production potential, such micro/nano fused high-performance gas sensors will be next-generation key miniaturized/integrated devices for advanced practical applications.