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Graphene Films Immobilized via Covalent Bonds and Their Applications in OFET 已有2人参与
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Title: Highly Stable Graphene-based Multilayer Films Immobilized via Covalent Bonds and Their Applications in Organic Field-Effect Transistors 链接: http://onlinelibrary.wiley.com/d ... .201202586/abstract Abstract: In this paper, we report that highly stable graphene oxide (GO)-based multilayered ultrathin films could be covalently immobilized on solid supports through a covalent-based method. It is demonstrated that when (3-aminopropyl) trimethoxysilane (APTMS), which works as a covalent cross-link agent, and GO nanosheets are assembled in an layer-by-layer (LBL) manner, GO nanosheets could be covalently grafted on the solid substrate successfully to produce uniform multilayered (APTMS/GO)N films over large area surface. Fascinatingly, it is found that compared with the conventional noncovalent LBL films constructed by electrostatic interactions, those assembled through our covalent-based method could display much higher stability and reproducibility. Upon the thermal annealing-induced reduction of the covalent (APTMS/GO)N films, the obtained reduced GO (RGO) films, (APTMS/RGO)N, could preserve their basic structural characters very well. We further disclose that the as-prepared covalent (APTMS/RGO)N multilayer films could be used as highly stable source/drain electrodes in organic field-effect transistors (OFETs). It is found that when the number of bilayers of the (APTMS/RGO)N film exceeds 2 (ca. 2.7 nm), the OFETs based on our (APTMS/RGO)N electrodes could display much higher electrical performances than that of the devices based on 40 nm Au electrodes. The experimental results indicate that this could be ascribed to their lower contact resistance, which is resulted from their relatively lower hole injection barrier. The covalent protocol proposed hereby might open up new and varied opportunities for the construction of graphene-based ultrathin films with an excellent stability and reproducibility, which are substantially desired for the practical applications to withstand the multi-step post-production process. Highlighted by MaterialsViews and Nanotechnology Now 链接: http://www.materialsviews.com/hi ... -covalent-protocol/ 链接: http://www.nanotech-now.com/news.cgi?story_id=46565  20121029-Figure for TOC(adfm 201002586).jpg |
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2012-12-30 16:29:41, 3.29 M
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