Universität zu Köln

Falke, Yannic, Senkovskiy, Boris, V, Ehlen, Niels, Wysocki, Lena, Marangoni, Tomas, Durr, Rebecca A., Chernov, Alexander, I, Fischer, Felix R. and Grueneis, Alexander (2020). Photothermal Bottom-up Graphene Nanoribbon Growth Kinetics. Nano Lett., 20 (7). S. 4761 - 4768. WASHINGTON: AMER CHEMICAL SOC. ISSN 1530-6992

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Abstract

We present laser-induced photothermal synthesis of atomically precise graphene nanoribbons (GNRs). The kinetics of photothermal bottom-up GNR growth are unravelled by in situ Raman spectroscopy carried out in ultrahigh vacuum. We photothermally drive the reaction steps by short periods of laser irradiation and subsequently analyze the Raman spectra of the reactants in the irradiated area. Growth kinetics of chevron GNRs (CGNRs) and seven atoms wide armchair GNRs (7-AGNRs) is investigated. The reaction rate constants for polymerization, cyclodehydrogenation, and interribbon fusion are experimentally determined. We find that the limiting rate constants for CGNR growth are several hundred times smaller than for 7-AGNR growth and that interribbon fusion is an important elementary reaction occurring during 7AGNR growth. Our work highlights that photothermal synthesis and in situ Raman spectroscopy are a powerful tandem for the investigation of on-surface reactions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Falke, Yannic UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, Boris, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Ehlen, Niels UNSPECIFIED UNSPECIFIED UNSPECIFIED Wysocki, Lena UNSPECIFIED UNSPECIFIED UNSPECIFIED Marangoni, Tomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Durr, Rebecca A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chernov, Alexander, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Felix R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueneis, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-326722
DOI:	10.1021/acs.nanolett.0c00317
Journal or Publication Title:	Nano Lett.
Volume:	20
Number:	7
Page Range:	S. 4761 - 4768
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1530-6992
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SURFACE; SPECTROSCOPY; FABRICATION; FILMS; GOLD Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32672