Journal
SMART MATERIALS AND STRUCTURES
Volume 25, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/25/5/055024
Keywords
ionic polymer-metal composite; ion migration; ambient humidity; electrical response
Funding
- HeFei University of Technology
- Grants-in-Aid for Scientific Research [15K16342] Funding Source: KAKEN
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A water-based ionic polymer-metal composite (IPMC) sensor, induced by ion migration, is a promising alternative to natural sensing systems. Focusing on water effects, this paper investigated the voltage responses of Au-Nafion IPMC at multiple fixed levels of ambient humidity under a small step bending deformation. The voltage includes two processes: a fast rising and a subsequent slow decay. As the relative ambient humidity decreases, the peak voltage first increases and then decreases because the mass storage capacity of IPMC, related to the compressed state of a polymer network, reaches the optimum at a moderate water content (30 similar to 90%RH), whereas the proportion of decay related to hydration effect decreases as the level of relative humidity is decreased. The detailed physics has been revealed qualitatively based on transport theory, and a fitting equation has been proposed to approximate the general electrical response.
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