Heparin-controlled growth of polypyrrole nanowires

摘要

Heparin, a potent anticoagulant, has been used for the first time for the synthesis of PPy nanowires serving not only as an anion dopant but also as an effective morphology-directing agent. The obtained PPy nanowires exhibit long and fine structures with smooth surface and the average diameter of the nanowires is about 90-100 nm and lengths are several hundred nanometers to micrometers. The possible formation mechanism of PPy nanowires may be related to the chain structure of heparin with functional groups (-SO3- and -COO-) on the surface. The effect of concentrations of pyrrole monomers and heparin on the. morphology and size of PPy nanowires has been investigated.