Stretching-Induced Growth of PEDOT-Rich Cores: A New Mechanism for Strain-Dependent Resistivity Change in PEDOT:PSS Films

Title
Stretching-Induced Growth of PEDOT-Rich Cores: A New Mechanism for Strain-Dependent Resistivity Change in PEDOT:PSS Films
Authors
Yoo-Yong LeeJi-Hoon LeeJu-Young ChoNa-Rae KimDae-Hyun Nam최인석Ki Tae NamYoung-Chang Joo
Keywords
tensile deformation; PEDOT:PSS; morphological changes; electrical resistivity
Issue Date
2013-08
Publisher
Advanced functional materials
Citation
VOL 23, NO 32, 4020-4027
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/46699
ISSN
1616301X
Appears in Collections:
KIST Publication > Article
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