Journal
SMALL
Volume 13, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201700070
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Funding
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [NRF-2013R1A2A2A01069070]
- Ministry of Culture, Sports and Tourism (MCST)
- Korea Creative Content Agency (KOCCA) in the Culture Technology (CT) Research and Development Program
- GIST Research Institute (GRI)
- Ministry of Science, ICT and Future Planning
- Korea Creative Content Agency (KOCCA) [R2015060029-0003] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015M3A7B7045376] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A secondary method for modulation of the sensitivity in silver nanowire (AgNW) resistive-type strain sensors without the need to change the material or coating process in the sensory layer is demonstrated. Instead of using a planar elastomer (polydimethylsiloxane is used in this study) substrate, diverse relief structures are introduced to induce nonuniform and complex strain within the elastic substrate and thereby different distributions of the crack density of the AgNWs upon stretching, which plays an important role in the modulation of the gauge factor (GF). Analysis of the sensory layer and mechanical studies reveal that a lower height ratio and greater number of trenches enhance the sensor sensitivity, for example, reaching a GF of 926 at 9.6% in this study. The demonstration of wrist-motion sensors using the technology illustrates the feasibility of using relief structures for various types of sensors and sensitivity ranges using an identical sensor layer.
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