| 초록 |
We demonstrate that pre-formed nanostructures (PNs) facilitate the self-assembly of polymer chains into longer, one-dimensional (1-D) nanostructures in poly(3-hexylthiophene) (P3HT) thin films during solvent vapor annealing (SVA). Consequently, a SVA with chlorobenzene (CB) significantly enhanced the charge-carrier mobility of the OFET devices based on PN1-P3HT films deposited from a sonicated solution and PN2-P3HT films deposited from an UV-irradiated solution. The surface area of the two films also significantly increased. After performing the SVA, highly improved sensitivities for detecting volatile organic compounds (VOCs) were observed for the OFET sensors, this can be attributed to the improved charge transport and surface-to-volume ratio of the films. In particular, the PN2-P3HT OFET sensors exhibited excellent responsivities and response/recovery times in the detection of the VOCs used: methanol (62.4%, 126s/130s), ethanol (41.5%, 134s/151s), toluene (33.2%, 89s/144s). |
