| 초록 |
The regioregularity (RR) of a polymer composed of asymmetric units is the most important factor in determining various physical properties without changing the chemical composition. A conjugated polymer with high RR exhibits superior molecular order and electrical properties, but stiff mechanical properties. This study systematically investigated the effect of the conjugated polymer, P3HT’s RR on the crystalline phase, free volume, and corresponding change in charge transport, and gas sensing properties. UV-vis, AFM, XRD, and XPS results showed that as the content of P3HT with low RR increased, the structural order of the semiconductor was reduced due to steric hindrance between hexyl side chains and the free volume was increased. The free volume operates as gas analytes interacting sites, which showed more enhanced responsivity for NO2 molecules. In addition, we also confirmed that the mechanical stability was improved as the content of P3HT with low RR increased. |
