Polythiophene Polybithiophene

In poly(3-alkylthiophene Mabboux et ai reported a comparative study of the spin dynamics by H NMR Tjjj and found a remarkable difference of the on-chain diffusion rate up to two orders of magnitude higher in both polyhexylthiophene and a diblock polystyrene— polythiophene co-polymer doped with BF4" than in both polybithiophene and polydimethyltetrathiophene doped with BF4 [375]. They ascribed such observations to degrees of structural order. 

Janiszewska, L., and Osteiyoung, R. A. [1987]. Electrochemistry of polythiophene and polybithiophene films in ambient temperature molten salts,/ Electrochem. Soc., 134, pp. 2787-2794. 

The conditions for polymerization were also foimd to be crucial in relation to polythiophene and polybithiophene films [58,80,84,114-121], The relatively high potential required for the oxidation prevents the use of many metallic substrates. The electrochemical oxidation of substituted thiophenes and thiophene oligomers yields conducting polymers, and these compounds can be electropolymerized at less positive potentials, so it is a good strategy to use these derivatives instead of thiophene (see Sect. 2.2.6). Another approach is the deposition of a thin polypyrrole layer that ensures the deposition of polythiophene on these substrates (eg., Ti, Au) [115]. Interestingly, other polymers as well as copolymers and composites (see Chap. 2) can also be synthesized. 

PBT = polybithiophene PDMTT = polydimethyltetrathiophene PHT = polyhexylthiophene, PS-PT = polystyrene-polythiophene copolymer. 

Conducting polymer-modified electrodes have potential usage in the fabrication of chemical detector for analytical applications [8]. As many of such research activities have focused extensively on the application of polypyrrole and its derivatives in the fabrication of biosensor especially glucose sensors [9], we have worked on the development of analytical probes using polythiophenes and polybithiophenes. An amperometric glucose sensors fabricated using enzyme/polybithiophene modified electrode has recently been reported [10]. 

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