TY - JOUR
T1 - Layer-by-layer assembly of PEDOT:PSS and WO3 nanoparticles
T2 - Enhanced electrochromic coloration efficiency and mechanism studies by scanning electrochemical microscopy
AU - Ling, Han
AU - Liu, Liang
AU - Lee, Pooi See
AU - Mandler, Daniel
AU - Lu, Xuehong
N1 - Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2015
Y1 - 2015
N2 - Layer-by-layer assembly method is employed to fabricate multilayer hybrid films based on poly (styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) and tungsten oxide nanoparticles (WO3 NPs). Polyethylenimine (PEI) is deposited in between to introduce electrostatic force between the components. In the hybrid films, randomly oriented disk-like WO3 NPs are homogeneously distributed in the polymers and form an interdigitated structure. This very rough surface morphology hinders the formation of a continuous PEI layer between the electrochromic layers. Owing to the efficient charge transfer between the two active components and complementary electrical conductivity of the two components in the redox switching process, the coloration efficiency of the hybrid film is significantly improved to 117.7 cm2/C at wavelength of 633 nm. The underlying mechanism for the enhancement is verified by scanning electrochemical microscopic studies through probing the conductivity changes of PEDOT:PSS, WO3-NP and hybrid films under various applied potentials.
AB - Layer-by-layer assembly method is employed to fabricate multilayer hybrid films based on poly (styrenesulfonate)-doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) and tungsten oxide nanoparticles (WO3 NPs). Polyethylenimine (PEI) is deposited in between to introduce electrostatic force between the components. In the hybrid films, randomly oriented disk-like WO3 NPs are homogeneously distributed in the polymers and form an interdigitated structure. This very rough surface morphology hinders the formation of a continuous PEI layer between the electrochromic layers. Owing to the efficient charge transfer between the two active components and complementary electrical conductivity of the two components in the redox switching process, the coloration efficiency of the hybrid film is significantly improved to 117.7 cm2/C at wavelength of 633 nm. The underlying mechanism for the enhancement is verified by scanning electrochemical microscopic studies through probing the conductivity changes of PEDOT:PSS, WO3-NP and hybrid films under various applied potentials.
KW - Coloration efficiency
KW - Electrochromic hybrid
KW - Scanning electrochemical microscopy
UR - http://www.scopus.com/inward/record.url?scp=84935864128&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2015.05.147
DO - 10.1016/j.electacta.2015.05.147
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AN - SCOPUS:84935864128
SN - 0013-4686
VL - 174
SP - 57
EP - 65
JO - Electrochimica Acta
JF - Electrochimica Acta
IS - 1
ER -