Title : Optical fiber VOCs gas sensors development working at room temperature
Abstract:
Semiconductor nanomaterials-based gas sensors can sensitively distinguish the concentration of volatile organic compounds (VOCs) gases with extremely low detection limits. However, the semiconductor nanomaterials must be maintained at high temperatures to provide the optimal catalytic performance, which poses a safety hazard in actual gas detection processes. We will showcase the relevant work of novel optical fiber VOCs sensors in the past two years. The cascaded fusion spliced fiber VOCs probe based on hollow fiber and elaborated the N-CQDs@In2O3 porous ordered to measure the concentration of acetone with the limit of detection (LOD) of 500ppb within the response time of 6.2s and the recovery time of 7.1s; a triethylamine (TEA) gas sensor based on the macro-bend fiber and ZnOHF-ZnO nanomaterials coating layer was proposed and experimentally demonstrated with the LOD of 1 ppm and response time of 16 s; an single mode fiber-no-core fiber-single mode fiber (SNS) structure coated by chitosan@PDMS performs the sensitivity of 7.7 pm/ppm for detecting the formic acid concentration. The humidity-induced detection error can be corrected in real-time by the correction formula. When the optical fiber sensors were used to determine the different status of humans based on the humidity data during respiration process, WOA-1D CNN-LSTM neural network was verified with a high recognition rate of up to 97.62%. Our work is crucial for developing the high-performance gas sensors with the potential properties of inherently safe, miniaturized, and wearable.
