We have investigated the effects of dry and wet type graphene surfaces on the chain orientation of poly(3-hexylthiophene) molecules as a thickness of the film. Wet type graphene requires (needs) solution etching process to remove stamp polymer layer, while dry type graphene could be obtained by direct transformation to a target substrate by delaminating support polymer without solution processing. In case of thin P3HT films (&lt;40 nm), the preferential ordering of P3HT was face-on on both graphene surfaces. The face-on preferential orientation of P3HT was changed to edge-on orientation over 40 nm thick films on the wet graphene surface. However, the face-on preferential orientation was still dominant over 40 nm thick films on the dry graphene surface. Due to the different preferential orientation, the surface roughness of P3HT was different over 40 nm tick films. P3HT surface was smooth on a wet graphene, while it showed very rough surface on a dry graphene. The results indicated that dry graphene surface was more favorable to change the P3HT ordering in comparison with wet graphene surface not only interface region close to graphene surface but also the bulk region in the thick films.

Preferential ordering of poly(3-hexylthiophene) on two type graphene substrates

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.