Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7147411 | Sensors and Actuators B: Chemical | 2014 | 7 Pages |
Abstract
This study presents a simple process for producing resistance-based humidity sensors utilizing dopamine (DA)-coated gold nanoparticles (AuNPs) as the sensing material. Highly hydrophilic dopamine biomolecules are physically bonded to 4-6Â nm AuNPs to enhance humidity sensing performance. Results show that the DA-coated AuNPs have good humidity sensing performance in the range of 20-90% R.H. The measured resistance response is more than 1900 times greater than sensors using the same AuNPs without a DA coating. The developed humidity sensor shows rapid response time for water adsorption (5Â s) and desorption (10Â s). Moreover, a 3-day long-term measurement at low medium and high humidity ranges also showed that the developed sensor has good stability. The method developed in this study provides a simple and inexpensive method to produce high-performance humidity sensors by using DA-coated AuNPs.
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Authors
Ho-Cheng Lee, Chun-Yi Wang, Che-Hsin Lin,