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Effect of substrate on growth and electronic properties of bottom-up synthesized graphene nanoribbons

par Caroline CHAMPENOIS - publié le

séminaire du laboratoire
lundi 20 mars, 16:00 service 322 campus Saint-Jérôme

Konstantin Simonov

Uppsala University, Dept. of Physics and Astronomy,
Box 516, SE-75120 Uppsala, Sweden

abstract :

In the recent years, graphene nanoribbons (GNRs) have been particularly prominent due to their remarkable structural and electronic properties [1]. From technological standpoint, the quasi one-dimensional nature of GNRs presents numerous advantages over the widely known two-dimensional graphene layers [2]. However, the implementation of GNRs in electronic devices relies on the ability to produce GNRs with well-defined atomic structure. Among the several existing methods used to produce GNRs, the bottom-up is the only technique offering a high-level of precision [3]. Usually, in this approach, specially designed precursor monomers are deposited on the metal surface and thermally activated to form GNRs as a result of the consecutive on-surface reactions [3].
In this presentation, I will make a general introduction of the topic. Then, based on scanning tunneling microscopy (STM) and X-ray spectroscopy results [4,5], I will demonstrate how the chemical properties of metallic substrates affect the growth and the electronic structure of GNRs. In the last part of my talk, I will present the recent progresses made in the technical development of our new experimental setup for pump-probe experiments [6], and explain the interest to perform pump-probe time- and angle-resolved photoemission (TR-ARPES) on GNRs.
References :
[1] Yazyev, O.V. A Guide to the Design of Electronic Properties of Graphene Nanoribbons. Acc. Chem. Res. 2013, 46, 2319-2328.
[2] Han, M. Y., et al. Energy Band-Gap Engineering of Graphene Nanoribbons. Phys. Rev. Lett. 2007, 98, 206805.
[3] Talirz, L., et al. On‐Surface Synthesis of Atomically Precise Graphene Nanoribbons. Adv. Mater. 2016, 28, 6222-6231.
[4] Simonov, K. A., et al. Effect of Substrate Chemistry on the Bottom-Up Fabrication of Graphene Nanoribbons : Combined Core-Level Spectroscopy and STM Study. J. Phys. Chem. C 2014, 118, 12532-12540.
[5] Simonov, K.A, et al. Effect of Electron Injection in Copper-Contacted Graphene Nanoribbons. Nano Res. 2016, 9, 2735-2746.
[6] Plogmaker, S., et al. HELIOS - A Laboratory Based on High-order Harmonic Generation of Extreme Ultraviolet Photons for Time-Resolved Spectroscopy. Rev. Sci. Instrum. 2015, 86, 123107.

contact : Thierry Angot

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