Electronic nano sponge breath ammonia sensors using hygroscopic polymers on vertical channel nano-porous structure

Wei Lun Chen, Huang Cheng Chiu, Hsuan Chu, Ju Chun Hsieh, Bing Xin Chen, Ya Chun Tian, Shuh Kuan Liau, Ming Jen Chan, Chia Jung Lu, Hsin-Fei Meng, Sheng Fu Horng*, Chien-Lung Wang, Hsiao-Wen Zan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this work, insulating hygroscopic polymer thin films have been applied as the vertical-channel sensing layer of extremely sensitive ammonia sensors to detect 5-1000 ppb ammonia. Hygroscopic polymers such as poly(ethylene glycol) (PEG), polyvinyl alcohol (PVA), and poly(acrylic acid) (PAA) serve as good absorbents of ammonia gas. The high-density nano-porous structure covered by a hygroscopic thin film acted like a nano-porous sponge (Nano Sponge) to absorb water, which forms an ionic conduction path in the 300 nm vertical channels. The influences of the polymer functional groups, pH value, relative humidity (RH), and other interfering gas analytes on the sensing performances of theNano Spongesensors have also been investigated. After adding glycerol, the Glycerol/PEGNano Spongesensors exhibited a stable response. Breath detection in a healthy group and a chronic kidney group of patients was examined using the Glycerol/PEGNano Spongesensor in a sensing system with a NaOH tube to control the relative humidity and to absorb the interfering species such as CO and H2S.

Original languageEnglish
Pages (from-to)12938-12950
Number of pages13
JournalJournal of Materials Chemistry C
Volume9
Issue number37
DOIs
StatePublished - 7 Oct 2021

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