Synthesis and characterization of a novel poly(N-vinyl)-3-[p-nitrophenylazo] carbazolyl-CdS nanocomposites through chemical hybridization

摘要

A novel bi-functionai photorefractive (PR) poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl with carbazolyl fragments and chromophoric azophenyl was synthesized by a post azo coupling reaction and characterized by 'H NMR, elemental analysis, UV-Vis absorption and FTIR spectroscopy. Then chemical hybridized poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl-CdS nanocomposites with different molar ratio of CdS to poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl were prepared. It was confirmed that the CdS particles had a nanoscale size and quantum confinement effect adopting transmission electron microscopy and UV-Vis absoiption spectroscopy. The generation of photocurrent on illumination and photoconductive properties of the nanocomposites were studied. Significant enhancement in photoconductivity induced by the chemical doping of CdS in poly(iV-vmyl)-3-[P-nitrophenylazo]carbazolyl has also been demonstrated.