CLUSTERING EFFECTS IN POLYANILINE CHAINS

Theoretical investigations on the effect of random protonation on the eletronic behaviour of long finite chains of polyaniline have shown th at the presence of disorder is an essential feature to explain the obs erved semiconductor-metal transition. In this work we have extended th e study of disorder including a pair correlation (short range order) p arameter in order to simulate the effects of segregation (clustering) in one-dimensional chains. Our results have shown that the inclusion o f these aspects do not affect the general features earlier obtained, d isorder is still in the origin of the semiconductor-metal transition.