Interband cascade laser absorption sensor for real-time monitoring of formaldehyde filtration by a nanofiber membrane
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AbstractIt is important to reduce the indoor formaldehyde (H2CO) level to improve indoor air quality. To investigate the H2CO filtration by a novel nanofiber membrane made from metal-organic frameworks (MOFs), we developed a laser absorption gas sensor for real-time H2CO monitoring using a room-temperature interband cascade laser (ICL) emitting at 3.6 µm. Wavelength modulation spectroscopy combined with a multipass gas cell (36 m path length) was implemented to achieve a detection sensitivity of 3 ppb H2CO at 1-s averaging time. We custom-designed a permeation H2CO generator that produces reference H2CO/N2 mixtures with an uncertainty of 6.4% in concentration. With the time-resolved continuous measurements, we observed a high filtration efficiency of 83% for the MOF filter, which, however, decreases linearly to 30% after operating for 3 h. Hence, the ICL-based gas sensor has proved to be a promising technique to assess novel nanomaterials for indoor air purification and pollutant control applications.
All Author(s) ListChenyu Yao, Zhen Wang, Qiang Wang, Ye Bian, Chun Chen, Li Zhang, Wei Ren
Journal nameApplied Optics
Year2018
Month9
Day20
Volume Number57
Issue Number27
Pages8005 - 8010
ISSN1559-128X
eISSN2155-3165
LanguagesEnglish-United States

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