Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 23, Issue 32, Pages 4020-4027Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201203670
Keywords
tensile deformation; PEDOT:PSS; morphological changes; electrical resistivity
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Funding
- Ministry of Education, Science and Technology [2012K001290]
- Global Frontier R&D Program on Center for Multiscale Energy System
- NRF [2011-0031574]
- National Research Foundation of Korea [2011-0031574] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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It remains a fundamental challenge in the development of stretchable electronics to understand how mechanical strain changes the electrical properties of materials. Although the piezoresistive behavior of poly(3,4-ethylene- dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been observed, its intrinsic origin is not yet fully understood because there are many extrinsic contributing factors and an experimental platform with which to assess such behavior has not been established. Here, systematic analysis shows that the matching Poisson's ratio and elastic modulus between PEDOT:PSS films and their underlying substrates is important in decoupling the factors that affect the material's piezoresistivity, allowing for tunable resistivity. Based on such a fundamental understanding, the conductivity of PEDOT:PSS can be controlled to be invariant and decrease as a function of applied tensile stress. Furthermore, a linear response of the resistivity with respect to mechanical strains of up to 60%, which has never before been realized, is shown. The irreversible conductivity enhancement is primarily caused by the coalescence-induced growth of conductive PEDOT-rich cores.
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