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Characterization an...
Characterization and Functionalization of 2D Overlayers Adsorbed on Transition Metals
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- Ng, May Ling, 1975- (författare)
- Uppsala universitet,Yt- och gränsskiktsvetenskap
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- Mårtensson, Nils, Professor (preses)
- Uppsala universitet,Yt- och gränsskiktsvetenskap
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- Preobrajenski, Alexei, Doctor (preses)
- MAX-lab, Lund University
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- Borg, Anne, Professor (opponent)
- Norges teknisk-naturvitenskapelige universitet
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(creator_code:org_t)
- ISBN 9789155478902
- Uppsala : Acta Universitatis Upsaliensis, 2010
- Engelska 79 s.
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Serie: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 ; 766
- Relaterad länk:
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https://uu.diva-port... (primary) (Raw object)
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Abstract
Ämnesord
Stäng
- Two-dimensional layered materials, namely monolayer hexagonal boron nitride and graphene were grown by CVD on various transition metals. The physical and chemical properties of these systems were characterized systematically using synchrotron-based spectroscopic techniques, scanning tunneling microscopy and low energy electron diffraction. It is learned that the overlayer–substrate interaction is caused by the overlayer π–substrate d band hybridization. The physical properties of these overlayers depend on the strength of interaction and the degree of lattice matching at the interface. The strength of interaction between the boron nitride and graphene overlayers and the transition metal substrates is increasing from Pt(111)–Ir(111)–Rh(111)–Ru(0001). For overlayers adsorbed on Rh and Ru, the interplay between these two parameters can result in corrugation of the overlayer, i.e. a surface with bonding and non-bonding areas. The amplitude of corrugation is increasing with the strength of interfacial interaction. The corrugated BN overlayer (BN nanomesh) was used as a template for the growth of two-dimensional and highly dispersive Au nanoparticles. In addition, the inert BN nanomesh was used as a substrate for the deposition of pentacene molecules that conform to the corrugated surface while preserving the herringbone crystal structure. The coadsorption of oxygen and Co clusters on the nanomesh was investigated. Oxygen was utilized to lower the Co surface energy, i.e. to prevent Co agglomeration. It is observed that the smaller Co clusters intercalate through the BN overlayer upon soft annealing. Beside the surface structure, the substrate induced surface reactivity of the MG overlayer was employed to promote the hydrogenation of graphene on Pt, Ir and Ni. The graphene layer adsorbed on Pt and Ir shows higher H uptake than MG/Ni. Furthermore the uptake increases with the size of the bonded graphene. The small H uptake for MG/Ni was attributed to the electron localization in the C-Ni bonds.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- h-BN
- graphene
- transition metals
- nanomesh
- functionalization
- PES
- NEXAFS
- STM
- LEED
- Condensed matter physics
- Kondenserade materiens fysik
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Publikations- och innehållstyp
- vet (ämneskategori)
- dok (ämneskategori)
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