Electrochemistry of conductive polymers 36. pH dependence of polyaniline conductivities studied by current-sensing atomic force microscopy
SCIE
SCOPUS
- Title
- Electrochemistry of conductive polymers 36. pH dependence of polyaniline conductivities studied by current-sensing atomic force microscopy
- Authors
- Hong, SY; Park, SM
- Date Issued
- 2005-05-19
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We demonstrate from our current-sensing atomic force microscopic studies that both electrical and topographical properties of electrochemically prepared polyaniline (PAn) films are affected by their preparation conditions. The electrical properties of the fully doped PAn films prepared in 0.30 M nitric acid with its pH and ionic strength adjusted to 0.50 can be described as a conductor with an average conductivity of 49 ( 13) S/cm with primarily a compact structure resulting from a relatively small growth rate. The doped PAn films prepared at pH 5.0, for example, have compact structures with large grains and lightly doped semiconducting properties with an average conductivity of about 1.54 (+/- 0.09) x 10(-4) S/cm. From these data, we conclude that the degree of protonation of the monomers and the main reactions taking place during an early stage of the polymerization reaction are important factors determining the chemical structures as well as their conductivities and morphologies of the PAn films.
- Keywords
- MOLECULAR ELECTRONICS; CARBON NANOTUBES; ELECTRICAL MEASUREMENTS; ANILINE POLYMERIZATION; FILMS; CORROSION; POLYPYRROLE; IDENTIFICATION; SPECTROSCOPY; ELECTROLYTES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24592
- DOI
- 10.1021/JP050173G
- ISSN
- 1520-6106
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, vol. 109, no. 19, page. 9305 - 9310, 2005-05-19
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