▎ 摘　　要

This work is part of our ongoing studies to develop conducing polymer nanocomposite-based sensors for detection of neurotransmitter dopamine, and reports on synthesis of a highly conducive, self-doped nanocomposite of polyaniline. Nanocomposites of poly (anilineboronic acid) (PABA) were fabricated through in situ chemical polymerization of 3-aminophenylboronic acid monomers in the presence and in the absence of different carbonaceous materials such as DNA-functionalized carbon nanotubes (DNA_CNT), nitrogen-doped graphene (NEG) and a hybrid structure of DNA-functionalized carbon nanostructures (DNA_CNT_NEG). Among the templates used, DNA_CNT_NEG acted as the best anchoring molecular template during polymerization, which increased the stability of the respective polymer nanocomposites after polymerization. This stability improvement was attributed to the formation of conducive state of polyaniline (emeraldine salt). The good pre-dispersion state of DNA_CNT_NEG in monomer solution increased the effective molecular interactions at the interfacial layer of nanofillers and monomers. This resulted in fabrication of highly-ordered and polyconjugated structure of PABA nanocomposites with superior electrical conductivity (14300 S m(-1) at 3.0 wt% filler content) compared to pure PABA (4 x 10(-9) S m(-1)) or polymer composites synthesized with neat CNT (1.75 x 10(-4) S m(-1) at 3.0 wt% filler content). PABA composites were also synthesized via in situ electrochemical polymerization of anilineboronic acid monomers in the presence of DNA_CNT_NEG using cyclic voltammetry technique, and were used to detect nanomolar concentrations of dopamine. The fabricated biosensor showed a very high sensitivity of 6 nM and a very wide linear range of 0.007-1 mu M. The fabricated nanocomposite electrodes containing DNA_CNT_NEG are promising sensors for diagnosis of neurological disorders such as Parkinson's.