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Wearable anti-temperature interference strain sensor with metal nanoparticle thin film and hybrid ligand exchange

Authors
Choi, Young KyunPark, TaesungLee, Dong Hyun DavidAhn, JunhyukKim, Yong HwanJeon, SanghyunHan, Myung JoonOh, Soong Ju
Issue Date
23-6월-2022
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.14, no.24, pp.8628 - 8639
Indexed
SCIE
SCOPUS
Journal Title
NANOSCALE
Volume
14
Number
24
Start Page
8628
End Page
8639
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142948
DOI
10.1039/d2nr02392j
ISSN
2040-3364
Abstract
Anti-interference characteristics, whereby undesirable signal interference is minimized, are required for multifunctional sensor platforms. In this study, an anti-temperature-interference resistive-type strain sensor, which does not respond to temperature but only to strain, is designed. Anti-interference properties were achieved by modulating the temperature coefficient of resistance (TCR) of metal nanoparticles (NPs) through hybrid chemical treatment with organic and halide ligands that induce negative and positive TCRs, respectively. Consequently, a very low TCR of 1.9 x 10(-5) K-1 was obtained. To investigate the origin of this near-zero TCR, analyses of correlated electrical, thermal, and mechanical properties were performed in addition to structural characterization and analysis. Density functional theory calculations and electrical percolation modeling were performed to illuminate the transport behavior in the near-zero-TCR NP thin films. Finally, we fabricated a high-performance anti-temperature-interference strain sensor using a solution process. The sensors detect a variety of strains, including those arising from large movements, such as wrist and knee movements, and fine movements, such as artery pulses or movements made during calligraphy, and did not respond to temperature changes.
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Oh, Soong Ju
공과대학 (신소재공학부)
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