Towards electron transport measurements in chemically modified graphene
Stark, Wendelin J.
Koehler, Fabian M.
- Journal Article
Rights / licenseCreative Commons Attribution 3.0 Unported
The chemical functionalization of graphene modifies the local electron density of carbon atoms and hence electron transport. Measuring these changes allows for a closer understanding of the chemical interaction and the influence of functionalization on the graphene lattice. However, not only chemistry, in this case diazonium chemistry, has an effect on electron transport. The latter is also influenced by defects and dopants resulting from different processing steps. Here, we show that the solvents used in the chemical reaction process change the transport properties. In more detail, the investigated combination of isopropanol and heating treatment reduces the doping concentration and significantly increases the mobility of graphene. Furthermore, isopropanol treatment alone increases the concentration of dopants and introduces an asymmetry between electron and hole transport, which might be difficult to distinguish from the effect of functionalization. The results shown in this work demand a closer look at the influence of solvents used for chemical modification in order to understand their influence. Show more
Journal / seriesNew Journal of Physics
Pages / Article No.
PublisherInstitute of Physics
Organisational unit03439 - Ensslin, Klaus / Ensslin, Klaus
03673 - Stark, Wendelin J. / Stark, Wendelin J.
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