We studied the formation of graphene nanoribbons (GNRs) via the self-assembly of 10,10'-dibromo-9,9'-bianthryl precursor molecules on gold surfaces with different synchrotron spectroscopies. Through X-ray photoemission spectroscopy core-level shifts, we followed each step of the synthetic process, and could show that the Br-C bonds of the precursors cleave at temperatures as low as 100 degrees C on both Au(111) and Au(110). We established that the resulting radicals bind to Au, forming Au-C and Au-Br bonds. We show that the polymerization of the precursors follows Br desorption from Au, suggesting that the presence of halogens is the limiting factor in this step. Finally, with angle-resolved ultraviolet photoemission spectroscopy and density functional theory we show that the GNR/Au interaction results in an upshift of the Shockley surface state of Au(111) by similar to 0.14 eV, together with an increased electron effective mass.

Probing the mechanism for graphene nanoribbon formation on gold surfaces through X-ray spectroscopy / Batra, Arunabh; Cvetko, Dean; Kladnik, Gregor; Adak, Olgun; Cardoso, Claudia; Ferretti, Andrea; Prezzi, Deborah; Molinari, Elisa; Morgante, Alberto; Venkataraman, Latha. - In: CHEMICAL SCIENCE. - ISSN 2041-6520. - ELETTRONICO. - 5:(2014), pp. 4419-4423. [10.1039/C4SC01584C]

Probing the mechanism for graphene nanoribbon formation on gold surfaces through X-ray spectroscopy

FERRETTI, Andrea;PREZZI, Deborah;MOLINARI, Elisa;
2014

Abstract

We studied the formation of graphene nanoribbons (GNRs) via the self-assembly of 10,10'-dibromo-9,9'-bianthryl precursor molecules on gold surfaces with different synchrotron spectroscopies. Through X-ray photoemission spectroscopy core-level shifts, we followed each step of the synthetic process, and could show that the Br-C bonds of the precursors cleave at temperatures as low as 100 degrees C on both Au(111) and Au(110). We established that the resulting radicals bind to Au, forming Au-C and Au-Br bonds. We show that the polymerization of the precursors follows Br desorption from Au, suggesting that the presence of halogens is the limiting factor in this step. Finally, with angle-resolved ultraviolet photoemission spectroscopy and density functional theory we show that the GNR/Au interaction results in an upshift of the Shockley surface state of Au(111) by similar to 0.14 eV, together with an increased electron effective mass.
2014
5
4419
4423
Probing the mechanism for graphene nanoribbon formation on gold surfaces through X-ray spectroscopy / Batra, Arunabh; Cvetko, Dean; Kladnik, Gregor; Adak, Olgun; Cardoso, Claudia; Ferretti, Andrea; Prezzi, Deborah; Molinari, Elisa; Morgante, Alberto; Venkataraman, Latha. - In: CHEMICAL SCIENCE. - ISSN 2041-6520. - ELETTRONICO. - 5:(2014), pp. 4419-4423. [10.1039/C4SC01584C]
Batra, Arunabh; Cvetko, Dean; Kladnik, Gregor; Adak, Olgun; Cardoso, Claudia; Ferretti, Andrea; Prezzi, Deborah; Molinari, Elisa; Morgante, Alberto; Venkataraman, Latha
File in questo prodotto:
File Dimensione Formato  
c4sc01584c.pdf

Accesso riservato

Tipologia: Versione pubblicata dall'editore
Dimensione 979.26 kB
Formato Adobe PDF
979.26 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1062763
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 73
  • ???jsp.display-item.citation.isi??? 70
social impact