A simple and flexible route to large-area conductive transparent graphene thin-films

K. Arapov, A. Goryachev, G. With, de, H. Friedrich

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
240 Downloads (Pure)


Solution-processed conductive, flexible and transparent graphene thin films continue drawing attention from science and technology due to their potential for many electrical applications. Here, an up-scalable method for the solution processing of graphite to graphene and further to self-assembled large-area conductive transparent thin-films is presented. The method proceeds via the graphite intercalation route followed by thermal expansion to obtain expanded graphite. The resulting material is dispersed in a surfactant-free mixture of isopropanol and propylene glycol to obtain a stable colloidal dispersion. A graphene thin film is subsequently formed by self-organization at an oil/water interface followed by lift-up transfer to virtually any substrate of interest. Thermally annealed thin-films exhibit a thickness-tunable sheet resistances of between 10 and 0.8 kO/¿ with transparencies between 75% and 45% at 500 nm wavelength, respectively. Additional Au-doping decreases the sheet resistance by a factor of 5. Heating doped films to temperatures above 380 K or exposure to ambient conditions significantly increases the sheet resistance as a result of decreasing charge carrier concentration. The presented method is a simple, up-scalable and thus competitive alternative to other techniques for large area graphene film production.
Original languageEnglish
Pages (from-to)67-75
Number of pages9
JournalSynthetic Metals
Publication statusPublished - 2015


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