Humidity‐Initiated Gas Sensors for Volatile Organic Compounds Sensing
Name
10.1002-adfm.202101310.pdf
Size
1.69 MB
Format
Adobe PDF
Checksum (MD5)
1cd786ae39aca013a1de5b209599e417
Author(s)
Robinson, Maxwell T.
Tung, Julie
Heydari Gharahcheshmeh, Meysam
Gleason, Karen K.
Date Issued
March 31, 2021
Journal
Advanced Functional Materials
Publisher
Wiley
Citation
Robinson, M. T., Tung, J., Heydari, M., Gleason, K. K., Humidity-Initiated Gas Sensors for Volatile Organic Compounds Sensing. Adv. Funct. Mater. 2021, 31, 2101310.
Version
Author's final manuscript
Abstract
A new volatile organic compounds (VOCs) sensing concept called humidity-initiated gas (HIG) sensors is described and demonstrated. HIG sensors employ the impedance of water assembled at sensor interfaces when exposed to humidity to sense VOCs at low concentrations. Here, two HIG sensor variants are studied—Type I and Type II. Type I sensors benefit from simplicity, but are less attractive in terms of key performance metrics, including response time and detection limits. Type II sensors are more complex, but are more attractive in terms of key performance metrics. Notably, it is observed that the best-in-class Type II HIG sensors achieve <2 min response times and <10 ppb detection limit for geranyl acetone, a VOC linked to the asymptomatic form of Huanglongbing (HLB) citrus disease. Both Type I and Type II sensors are assembled from off-the-shelf materials and demonstrate remarkable stability at high humidity. HIG sensors are proposed as an attractive alternative to existing VOCs sensors for remote field detection tasks, including VOCs detection to diagnose HLB citrus disease.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1002/adfm.202101310
