Deposition polyaniline synthesis

Gao et al. reported the synthesis of aligned coaxial nanowire of carbon nanotubes with polypyrrole or polyaniline using a cyclic voltammetric technique [50]. DC conductivity of the polyaniline-coated nanotube film was measured to be 10 S cm , which is higher than that of polyaniline film electrochemically deposited on a gold plate under the same conditions. This is possibly due to the doping effect associated with carbon nanotubes. 

The electropolymerization of o-methoxyaniline in the presence of (+)-(lS)- or (-)-(ll )-CSA yields an optically active polyaniline derivative. The polymer shows intense CD bands as a film deposited on an electrode. The polymer is soluble in NMP, CHCI3, DMF, DMSO, and MeOH, and the polymer also showed CD absorption in a solution probably based on a chiral main-chain conformation such as a helix. A film made by spin-coating a mixture of polyaniline with CSA also showed strong CD absorptions, which may be based on a helical conformation of the main chain. The electropolymerization method has been applied to the synthesis of an optically active polypyrrole which may have a helical conformation. ... 

Apart from chemical synthesis, electrochemical synthesis is a versatile method for the preparation of self-doped sulfonated polyaniline in both soluble forms and thin films deposited on an electrode surface. Electropolymerization of sulfonated polyaniline homopolymers and copolymers has been carried out in aqueous and nonaqueous media. Similar to chemical synthesis, electrochemically controlled electrophilic and nucleophilic substitution reactions are also reported. 

We have approached the goal of functionalised monolayer fabrication by synthesis of a group of azobenzene-containing amphipathic molecules. Such molecules can be deposited by either chemisorption or physisorption and should allow hybrid films to be fabricated. The monolayers are reversibly photochromic (which might prove useful in sensor fabrication) and are capable of chemical activation for surface attachment of macromolecules, etc. In addition, the activated surface can be photochemi-cally modified so that photolithography could be used to fabricate surface structures such as danains of particular ccxnposition. With particular regard to conductive polyers, polyanilines could be locally formed as discussed later. 

The enzymatic mediated synthesis of a polyaniline monolayer at the air-water interface was examined. Polymerisation was obtained with 4-hexadecylaniline and aniline (1 2) spread on the surface of water containing the enzyme horseradish peroxidase. The conductivity of the LB film deposited from the polymerised monolayer was 3 x 10 S/cm after iodine doping [300]. The same procedure was applied to the 4-tetradecyloxyphenol-phenol system and the conductivity value of 10 S/cm was attained... 

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