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M. Jung(정민훈),H. Lee(이현아),D. S. Kim(김동수) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
This paper presents an investigation on the humidity sensitivity of deposited cellulose-silver nanoparticles (AgNPs) using ink-jet printing between integrated electrodes (IDEs). The IDEs were fabricated on the glass using a Reverse-offset printer which has a soft double blanket. The Reverse-offset printing process is of great significance to exploit a simple, cost-effective, and environmentally friendly fabrication method of humidity sensors. Also, we have used coarse cellulose nanofiber (CNF) as a humidity sensor. Silver nanoparticles (AgNPs) as a humidity-sensitive layer were introduced onto cellulose surface via in situ reduction technique without disrupting cellulose structure. We have confirmed the coarse cellulose nanofiber silver nanoparticles (CNF-AgNPs) using UV–visible spectroscopy, transmission electron microscopy (TEM), and scattering electron microscopy (SEM) analysis revealed the successful deposition of silver nanoparticles onto coarse cellulose surface, which is referred as a CNF-AgNPs nanocomposite. The humidity sensitivity using CNF-AgNPs was obtained by measuring the resistance with different relative humidity at room temperature. The experimental results show the resistance increases linearly with increasing the relative humidity from 20 to 90% RH with highly sensitivity compared with coarse cellulose.