Multi‐walled carbon nanotubes (MWNT) purified by acidic solution were processed with PMMA via an in‐situ polymerization. Experimental evidences indicate the role of radical initiator (AIBN) and MWNT, showing increases of polymerization rate and MWNT diameter. Induced radicals on the MWNT by AIBN were found to trigger the grafting of PMMA. Moreover, the solvent cast film showed a better nanoscopic dispersion of MWNT and possibilities of CNT composites in engineering applications.Fractured surface of multi‐walled carbon nanotube composite with PMMA prepared by in‐situ bulk polymerization.magnified imageFractured surface of multi‐walled carbon nanotube composite with PMMA prepared by in‐situ bulk polymerization.
High dielectric constant of gate insulators is one of the essential factors for reducing the threshold voltage of OTFTs. Viewed in this light, PVP solution mixed with high-k TiO 2 was synthesized and utilized as a gate insulator for lowering the threshold voltage and enhancing the subthreshold swing of OTFTs. As a result, we could increase the dielectric constant of the PVP-based insulator up to 5.8, and the OTFTs with the composite insulator showed the threshold voltage of about -8.3 V and the subthreshold slope of about 1.5 V/decade, which are the optimized properties compared to those of OTFTs with PVP in this study.
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