Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces: 1D and 2D structures and networks II
O 69.2: Vortrag
Mittwoch, 14. März 2018, 15:15–15:30, MA 141
Reaction pathway towards 7-armchair GNR formation and identification of intermediate species on Au(111) — Sebastian Thussing, •Sebastian Flade, and Peter Jakob — Fachbereich Physik, Philipps-Universität Marburg, 35032 Marburg, Germany
The reaction pathway of 10,10’-dibromo-9,9’-bianthryl (DBBA) deposited onto Au(111),
eventually leading to the formation of 7-armchair graphene nanoribbons (7-AGNR)
has been investigated. Individual reaction steps, along with the respective reaction intermediates
were identified using IR-absorption and thermal desorption spectroscopy.
They are characterized by distinct molecular species which have undergone
(i) halogen abstraction, (ii) polymerization of the bianthryl units,
(iii) H-abstraction and 5+-AGNR formation, and
(iv) further H-abstraction and 7-AGNR formation.
Identification of surface species is aided by calculations of the vibrational properties
of various model compounds. Comparison of TDS and IRAS data allows us to
establish a correlation between individual surface reaction steps and processes leading to the
desorption of molecular species, e.g. of intact DBBA, HBr, and H2.
Our refined model fully corroborates earlier observations of intermediate stages in the 7-AGNR
formation using STM [1, 2].
J. Cai et al., Nature 466 (2010) 470. [2] S. Blankenburg et al., ACS Nano 6 (2012) 2020.