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The Electrochemical Properties of Water‐soluble Polyaniline‐V 2 O 5 Nanocomposites
Author(s) -
Wu ChunGuey,
Hsu ShuiSheng,
Hwang JiunnYih,
Chung MingHau
Publication year - 2002
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200200128
Subject(s) - polyaniline , aniline , nanocomposite , chemistry , conductive polymer , protonation , electrochromism , electrochemistry , polyaniline nanofibers , polymer chemistry , chemical engineering , polymer , materials science , composite material , organic chemistry , electrode , polymerization , engineering , ion
Flexible, conducting water‐soluble polyaniline/V 2 O 5 nanocomposites: (PAPSA) x V 2 O 5 , (PSA) x V 2 O 5 , and (PAPSAH) x V 2 O 5 were prepared by simply mixing water soluble polyaniline, poly(aniline‐co‐N‐(4‐sulfophenyl)aniline) (PAPSA), poly(N‐(4‐sulfophenyl)aniline) (PSA), and poly(aniline‐co‐N‐propanesulfonic acid‐aniline) (PAPSAH) with V 2 O 5 wet gel at room temperature. XRD data showed that the interlayer spacing of polyaniline/V 2 O 5 nanocomposites is equal to 11∼13 Å which is slightly bigger than that of pristine V 2 O 5 which has one mole of water molecules in its layer gallery. Depth profile SIMS and Auger analysis revealed that the mixing of water‐soluble polyaniline and V 2 O 5 is very homogeneous although there was no direct evidence showing that alternative layer of water‐soluble polyaniline and V 2 O 5 was formed. Cyclic voltammograms of the nanocomposite films showed two pairs of red‐ox peaks with good reversibility. The redox potentials of the nano composites are different from those of water‐soluble polyaniline or V 2 O 5 . The color of the films can be yellowish green, green, brown, orange or purple, depending on the applied potentials and stoichiometry of the composites. The optical density ratio (ΔOD) of the nano composite films (< 4500 Å) is better than that of polymer and V 2 O 5 , due to the synergic effect of two electrochromic materials. ΔOD increased as the film thickness increased, and it is greater than 0.3 when the thickness of the composite film is larger than 2000 Å, indicating the potential application in electrochromic devices.