Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 50: HL Poster IV
HL 50.32: Poster
Thursday, March 15, 2018, 19:00–21:00, Poster B
XPS Study on the Doping of Single-walled Carbon Nanotubes by Covalent Functionalization — •Daniel Przyrembel1,2, Mareen Gläske1,2, Antonio Setaro1,2, Mohsen Adeli1,3,4, Rainer Haag1,3, Stephanie Reich1,2, and Martin Weinelt1,2 — 1Sonderforschungsbereich 658 — 2Freie Universität Berlin, Dept. of Physics, Berlin, Germany — 3Freie Universität Berlin, Dept. of Chemistry and Biochemistry, Berlin, Germany — 4Lorestan University, Dept. of Chemistry, Khorramābād, Iran
We have investigated functionalized carbon nanotubes (CNTs) by means of X-ray photoelectron spectroscopy (XPS). Covalent functionalization normally trades added functionalities for the electronic and optical properties of the CNTs. These rely on the conjugated sp2 hybridized carbon backbone that locally breaks upon the addition of functional groups. The functionalization used for this study aims to preserve the π-conjugation.[1] XPS measurements prove that after formation of aziridine rings by cycloaddition and subsequent ring opening the conjugated sp2 hybridized carbon backbone of single-walled semiconducting CNTs is restored. Moreover, the electron lone pair of the additional nitrogen atom is pushed into the π-electron system of the nanotube thereby doping it and leading to XPS peak shifts. By the amount of functionalization the doping level of the CNTs is tunable. The introduced side groups can also serve as attachment points for further functionalization, e.g., with molecular switches, to ultimately make the properties of the CNTs variable by external stimuli. See [1]: A. Setaro, M. Adeli, M. Glaeske et al. Nat. Commun. 2017, 8, 14281.