Lee, Yoo-Yong Lee, Ji-Hoon Cho, Ju-Young Kim, Na-Rae Nam, Dae-Hyun Choi, In-Suk Nam, Ki Tae Joo, Young-Chang 2024-01-20T11:34:34Z 2024-01-20T11:34:34Z 2021-09-05 2013-08-26 1616-301X https://pubs.kist.re.kr/handle/201004/127757 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. English WILEY-V C H VERLAG GMBH CONDUCTIVITY MORPHOLOGY ENHANCEMENT RESISTANCE SULFONATE) MATRIX Stretching-Induced Growth of PEDOT-Rich Cores: A New Mechanism for Strain-Dependent Resistivity Change in PEDOT:PSS Films Article 10.1002/adfm.201203670 1 ADVANCED FUNCTIONAL MATERIALS, v.23, no.32, pp.4020 - 4027 ADVANCED FUNCTIONAL MATERIALS 23 32 4020 4027 scie scopus 000327491600010 2-s2.0-84882650444 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article CONDUCTIVITY MORPHOLOGY ENHANCEMENT RESISTANCE SULFONATE) MATRIX tensile deformation PEDOT:PSS morphological changes electrical resistivity