Počet záznamů: 1
Decoupling chemically active 2D molecular overlayers from the substrate: chlorophenyl porphyrins on graphene/Ir(111)
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SYSNO ASEP 0583161 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Decoupling chemically active 2D molecular overlayers from the substrate: chlorophenyl porphyrins on graphene/Ir(111) Tvůrce(i) Mowbray, D.J. (EC)
Pérez Paz, A. (AE)
de Campos Ferreira, Rodrigo Cezar (FZU-D) ORCID
Milotti, V. (AT)
Schio, P. (BR)
Simoes e Silva, W. (BR)
Pichler, T. (AT)
de Siervo, A. (BR)
Moreno-Lopez, J.C. (AT)Celkový počet autorů 9 Zdroj.dok. Journal of Physical Chemistry C. - : American Chemical Society - ISSN 1932-7447
Roč. 127, č. 18 (2023), s. 8751-8758Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova 2D self-assembly ; graphene ; chlorophenyl porphyrin ; STM ; XPS ; ARPES Vědní obor RIV BE - Teoretická fyzika Obor OECD Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) Způsob publikování Open access Institucionální podpora FZU-D - RVO:68378271 UT WOS 000984954800001 EID SCOPUS 85156275533 DOI 10.1021/acs.jpcc.3c00235 Anotace The synthesis of atomically precise chemically active 2D molecular overlayers may be hindered by chemical interactions with the underlying substrate, especially when based on chlorophenyl porphyrins. At the same time, the chlorination of graphene, i.e., the covalent bonding of chlorine atoms with sp2 carbon atoms, is known to have a significant influence on the electronic properties of pristine graphene. In this study, we deposit a chlorinated porphyrin molecule, namely 5,10,15,20-tetrakis(4-chlorophenyl)porphyrin (Cl4TPP), on graphene/Ir(111). Employing a combined experimental and theoretical approach, we demonstrate that the porphyrin layer physisorbed on graphene self-assembles into a periodic square-like arrangement. This carpet-like growth is unperturbed by the step edges of the substrate, neither in its periodicity nor in its orientation. In addition, the molecular overlayer is thermally stable and does not alter the electronic properties of graphene. Remarkably, we show that Cl4TPP does not experience a dechlorination reaction with the underlying substrate, even after postdeposition annealing temperatures as high as 550 K. Moreover, postdeposition annealing at 700 K suggests the Cl4TPP molecules desorb intact without affecting graphene’s electronic properties. In so doing, we demonstrate the effectiveness of graphene physisorbed on Ir(111) to both promote the formation and preserve the properties of chemically reactive 2D overlayers based on chlorophenyl porphyrins. These results show physisorbed graphene’s potential as a general templating material for the formation of highly reactive self-assembled 2D overlayers. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2024 Elektronická adresa https://hdl.handle.net/11104/0351153
Počet záznamů: 1