Novel conjugated patterns of PBDT-DTNT and PBDT-TIPS-DTNT-DT complicated polymers onto graphenic nanosheets

摘要

The delicacy and connectivity of conductive patterns developed via poly[benzodithiophene-bis(decyltetradecylthien)naphthothiadiazole] (PBDT-DTNT) and poly[bis(triisopropylsilylethynyl)benzodithiophene-bis(decyltetradecylthien)naphthobisthiadiazole] (PBDT-TIPS-DTNT-DT) polymers were investigated on reduced graphene oxide (rGO) nanosheets. The principal driving force for assembly of PBDT-DTNT and PBDT-TIPS-DTNT-DT chains onto the rGO nanosheets was pi-stacking. In contrast to poly(3-hexylthiophene) (P3HT), the surface modification of rGO limited the self-assembly of PBDT-DTNT and PBDT-TIPS-DTNT-DT complicated polymers. The structure of PBDT-DTNT and PBDT-TIPS-DTNT-DT chains having fused and infused thiophenic and benzenic rings hindered their molecular ordering compared to P3HT, and therefore the selected area electron diffraction plots demonstrated rings instead of isolated growth planes. Although 2-thiophene acetic acid (TAA) functional groups and poly(3-dodecylthiophene) (PDDT) grafted onto rGO nanosheets did not alter the stacking type of the complicated polymers, it made their attachment more difficult. The thickness of pi-stacked patterns ranged from 55 to 70 nm. In the modified areas of rGO, the PBDT-DTNT and PBDT-TIPS-DTNT-DT chains were not capable of being deposited with a pi-interaction. Hence, the surface modification agents prevented the complicated polymers from interconnectedly assembling and, consequently, constructing longer and larger patterns. This hindrance was more noticeable for the supramolecules based on grafted rGO (rGO-g-PDDT) and PBDT-TIPS-DTNT-DT. The conductivity of PBDT-DTNT/rGO superstructures was the highest (14.61-14.89 S cm(-1)). The patterned nanohybrids could be considered as potential super-materials for morphology-templating in the active layers of organic-inorganic photovoltaics. (c) 2018 Society of Chemical Industry