Journal
IEEE SENSORS JOURNAL
Volume 16, Issue 24, Pages 8884-8889Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2016.2616484
Keywords
Chitosan; humidity; protonic conductance; hydrogen bond; thin film sensors
Funding
- MOE AcRF Tier2 Funding Singapore [MOE2013-T2-2-100]
- MOE AcRF Tier1 Funding Singapore [RG105/14]
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As a natural biopolymer, chitosan has a very unique protonic conductivity that is highly sensitive to water vapor. However, there has been no report on pure chitosan-based resistive humidity sensors, probably due to the difficulty of direct-current measurement of protonic current in chitosan. Here, a simple and cost-effective chitosan-based protonic conductive humidity sensor is presented. The sensor exhibits a large conductance response of four orders of magnitude when relative humidity is increased from 10% up to 90%. The effects of adsorbed water on proton density and dielectric constant change of chitosan could be responsible for the giant humidity response. More importantly, the sensor shows high stability, repeatability, recoverability, and selectivity to water vapor over ethanol, acetone, and toluene vapors.
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