Area-selective passivation of sp2 carbon surfaces by supramolecular self-assembly

Zhi Li; Hans Van Gorp; Peter Walke; Thanh Hai Phan; Yasuhiko Fujita; John Greenwood; Oleksandr Ivasenko; Kazukuni Tahara; Yoshito Tobe; Hiroshi Uji-i; Stijn F. L. Mertens; Steven De Feyter

doi:10.1039/C7NR00022G

Area-selective passivation of sp² carbon surfaces by supramolecular self-assembly†

Zhi Li,^a Hans Van Gorp,

^a Peter Walke,^a Thanh Hai Phan,^ab Yasuhiko Fujita,^a John Greenwood,*^c Oleksandr Ivasenko,*^a Kazukuni Tahara,^de Yoshito Tobe,

^e Hiroshi Uji-i,

^af Stijn F. L. Mertens

*^ag and Steven De Feyter

*^a

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* Corresponding authors

^a Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven–University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
E-mail: oleksandr.ivasenko@kuleuven.be, steven.defeyter@kuleuven.be, stmerten@gmail.com

^b Quynhon University, Department of Physics, 170 An Duong Vuong, Quynhon, Vietnam

^c School of Physics & Astronomy, University of Nottingham, Nottingham, UK
E-mail: john.greenwood@nottingham.ac.uk

^d Department of Applied Chemistry, School of Science and Technology, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, Japan

^e Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

^f Research Institute for Electronic Science, Hokkaido University, N20 W10, Kita-Ward, 001-0020 Sapporo, Japan

^g Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/E134, A-1040 Vienna, Austria

Abstract

Altering the chemical reactivity of graphene can offer new opportunities for various applications. Here, we report that monolayers of densely packed n-pentacontane significantly reduce the covalent grafting of aryl radicals to graphitic surfaces. The effect is highly local in nature and on fully covered substrates grafting can occur only at monolayer imperfections such as interdomain borders and vacancy defects. Grafting partially covered substrates primarily results in the covalent modification of uncoated areas.

Nanoscale

Area-selective passivation of sp² carbon surfaces by supramolecular self-assembly†

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