Inducing Intermolecular C-C Covalent Bonds between PAHs by Exposure to Atomic Hydrogen (JACS 2019)

The ESISNA group, in collaboration with the Nanotech@surfaces group from Empa (Switzerland), has demonstrated the catalytic role that atomic hydrogen can play in the formation of new intermolecular C-C covalent bonds on relatively inert surfaces. For this purpose, we have annealed a Au(111) surface, previously covered with different PAHs, in…

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On-surface chemistry: synthesis of azine derivatives with acceptor behaviour (Angew. Chem. 2018)

On-surface chemistry is a potential strategy focused on obtaining and developing novel nanomaterials of different dimensionalities with atomic precision. The growth mechanism is based on a bottom-up approach where molecular building blocks are evaporated onto a surface. Therefore, choosing the appropriate surface and precursor we are able to build and…

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Decoupling epitaxial graphene from metals by electrochemical oxidation (Carbon 2018)

The catalytic role of metallic substrates is a perfect starting point for growing high quality graphene layers by thermal decomposition of aromatics. However, metallic substrates quench the outstanding properties that make graphene the most promising material for future applications. Thus, protocols to transfer graphene to different technologically relevant substrates are…

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An atomic-scale look to graphene edge states (Nanoscale 2017)

Graphene edges are known to present localized electronic states that depend on the exact atomic configuration of the graphene border. It has been predicted that zigzag-ended and chiral-ended graphene nanostructures develop spatially and spectrally localized edge states around the Fermi level. However, experimental evidence remains scarce as atomic-scale investigations of…

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On-surface chemistry: (cyclo)dehydrogenation of PAH catalysed by coinage metal surfaces (Phys. Chem. Chem. Phys. 2017)

New nanoarchitectures can be built from polycyclic aromatic hydrocarbons (PAH) by exploiting the catalytic properties of some metal surfaces. Actually, this bottom-up approach allows the formation of nanostructures with different dimensionality from the same precursor as a consequence of the diffusion of the PAH on the surface. Thus, by selecting…

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New method to synthesize graphene by using C60 as carbon source (Carbon 2017)

In this work, we describe a new protocol to grow high-quality graphene by physical vapour deposition (PVD) using C60 molecules evaporated in ultra high vacuum conditions (UHV) on Cu foils substrates. The quality of the resulting graphene layer has been assessed by the combination of complementary surface characterization techniques. Additionally,…

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Unveiling the structural and electronic properties of epitaxial graphene superstructures on Pt(111): the role of the pinning points

Graphene growth on metal surfaces is one of the most promising routes towards scalable production of high-quality graphene suitable for industrial applications. Conventionally, the growth of graphene is carried out on weakly interacting surfaces – typically Cu foils – where the substrate plays a double role: first, as a catalyst;…

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Electronic contacts at the atomic scale for future graphene-based electronics

Due to its exceptional conduction properties, graphene has been proposed as a candidate to replace silicon in future electronics. However, several problems need to be overcome prior to its implantation in the production chain. Among these difficulties, one of the most fundamental unknown aspects is how to contact graphene with…

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