You Borwen, Ho Cheng-Han, Zheng Wen-Jie, Lu Ja-Yu
Opt Express. 2015 Feb 9;23(3):2048-57. doi: 10.1364/OE.23.002048.
A compact, inexpensive, low loss, highly sensitive gas sensor is important for various biomedical and industrial applications. However, current gas sensors still have an inadequate study in terahertz (THz) frequency range. In this study, simple multilayer-stacked microporous polymer membranes are experimentally validated in the THz regime for organic vapor sensing under ambient atmosphere and room temperature. The hydrophilic porous polymer structure provides a large surface area to adsorb polar vapors, and exhibits excellent discrimination in different types of organic vapors based on distinct dipole moments. Various concentrations of volatile vapors can also be successfully distinguished by detecting the limits of low ppm concentrations. Furthermore, the microporous structural gas sensor has a reasonable response time in repeat usage. This study would provide new perspectives on toxic gas sensing and exhaled breath detection applications in the THz spectral frequency.
一种紧凑、廉价、低损耗、高灵敏度的气体传感器对于各种生物医学和工业应用都很重要。然而，目前的气体传感器在太赫兹（THz）频率范围内的研究仍不充分。在本研究中，简单的多层堆叠微孔聚合物膜在太赫兹波段针对环境大气和室温下的有机蒸汽传感进行了实验验证。亲水性多孔聚合物结构提供了大表面积以吸附极性蒸汽，并基于不同的偶极矩在不同类型的有机蒸汽中表现出出色的辨别能力。通过检测低ppm浓度的限值，还能成功区分各种浓度的挥发性蒸汽。此外，微孔结构气体传感器在重复使用时具有合理的响应时间。本研究将为太赫兹光谱频率下的有毒气体传感和呼出气检测应用提供新的视角。
