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- W2803407384 abstract "Various conjugated polymer materials have been successfully applied in humidity sensors, but their response/recovery time are not satisfactory for breath humidity monitoring. In this research, a rapid and stable humidity sensor was fabricated from a polysquaraine, poly(1-phenylpyrrole-2-ylsquaraine) (PPPS) sample decorated by Au nanoparticles. Uniform PPPS microspheres in diameter were synthesized and loaded by gold nanoparticles (30 nm in diameter), and the structure was confirmed by X-ray photoelectron spectra and elemental mapping. Relative humidity (RH) values within the range of 11–95% were determined by testing the impedance response of the sensor at room temperature. The PPPS-2 sensor loaded with Au nanoparticles with 10% weight ratio to squaric acid offered the best humidity-sensing performance: the working range spreads from 11% to 95% RH; the response/recovery time is <1/4 s; its impedance variation reaches five orders of magnitude; the maximum hysteresis is 5%. Such a performance is attributed to electrical loading by gold and hydronium transportation. A portable device was fabricated for remote monitoring of breath humidity. Our results demonstrated that surface-engineered polysquaraines are of practical application in humidity measurement, and in particular, in breathing humidity monitoring." @default.
- W2803407384 created "2018-06-01" @default.
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- W2803407384 date "2018-10-01" @default.
- W2803407384 modified "2023-10-16" @default.
- W2803407384 title "Surface modification of polysquaraines to sense humidity within a second for breath monitoring" @default.
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- W2803407384 doi "https://doi.org/10.1016/j.snb.2018.05.085" @default.
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