▎ 摘　　要

Present paper gives a detailed description of the studies carried out on dodecylbenzenesulfonic acid (DBSA) doped, polypyrrole (PPy)/graphene nanocomposite films grown on glass substrates by spin coating and electro-spraying techniques. Solutions of doped polypyrrole/graphene nanocomposite are obtained in different solvents including dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidone (NMP) and meta-cresol (m-cresol). Thin films of DBSA doped, PPy/graphene nanocomposites are obtained on glass substrates by spin coating using the solutions in different solvents. Attempts are made to improve the solubility of DBSA doped PPy/graphene composite in m-cresol, by subjecting the solution in m-cresol to electro-spraying for two different concentrations of graphene. Presence of the dopant DBSA and graphene brings about more structural order for the DBSA doped, PPy/graphene nanocomposite and upgrades the crystalline nature of the nanocomposite to a significant extent. Structural, morphological and electrical properties of spin coated and electro-sprayed films of doped PPy/graphene nanocomposite are investigated in detail. One of the solvents used, m-cresol is known for its secondary doping effects. Electro-sprayed films of the nanocomposite are obtained using m-cresol as the solvent and these films show exceptionally higher extent of structural order and crystallinity, compared to spin coated films. Possibility of obtaining nanocomposite films with homogenous distribution of dopants and that of the components of the composite is higher when electro-spraying technique is used, compared to spin coating. Secondary doping effect of m-cresol and the advantageous aspects of electro-spraying technique in obtaining homogeneous distribution of the dopant DBSA and the precise dispersion of graphene in PPy matrix are the prime factors contributing towards the commendable structural order and more crystalline and defect free nature observed in electro-sprayed films of the nanocomposite. Flexible films of DBSA doped PPy/graphene nanocomposite, grown on glass substrates via spin coating and electro-spraying, exhibit remarkable enhancement in electrical conductivity, compared to pristine PPy films, derived from the orderly arrangement of the dopant and the presence of homogeneously dispersed graphene. These films offer potential application prospects as electromagnetic interference shields and as polymer based electrodes in rechargeable cells and display devices. They are highly flexible and combined with their commendable electrical conductivity, mechanical stiffness and biocompatible nature are quite suitable for designing various types of biomedical devices. [GRAPHICS]