Vibrational spectroscopy of hydrocarbon intermediates on Ru(001)

Barteau, Mark A.; Broughton, Jeremy Q.; Menzel, D.

doi:10.1016/0169-4332(84)90055-2

Cited by 26 publications

(62 citation statements)

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“…It was known that C 2 H 4 was dissociatively adsorbed on Ru(0001) surface at RT, forming ethylidyne [17,18] . Our previous studies showed that the Ru(0001) surface was covered by a layer of ethylidyne after exposure of 24 L C 2 H 4 at RT.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of metal nanoclusters on graphene grown on Ru(0001)

Zhang

Cui

et al. 2009

Chin. Sci. Bull.

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Monolayer graphene was epitaxially grown on Ru(0001) through exposure of the Ru(0001) to ethylene at room temperature followed by annealing in ultrahigh vacuum at elevated temperatures. The resulting graphene structures were studied by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS). The graphene/Ru(0001) surface was used as a periodic template for growth of metal nanoclusters. Highly dispersed Pt clusters with well controlled size and spatial distribution were fabricated on the surface. graphene, STM, Ru(0001), Pt nanoclusters Carbon presents various allotropes, such as graphite, diamond, and fullerene. Recently, Geim and coworkers [1,2] found a kind of new carbon allotrope-graphene. The graphene material can be regarded as an ordered 2-dimensional (2D) graphitic atomic crystal, and shows many unique physical and chemical properties. There are three methods to prepare graphene. The first is to cleave bulk graphite crystals using a micromechanical method [3] . The route could produce graphene flakes with size of dozens and even hundreds of micron meters but it is difficult to control the preparation process precisely. Graphene can be also obtained by heating SiC(0001) surfaces in ultrahigh vacuum (UHV) [4,5] . However, it is challenging to prepare graphene with controlled size and thickness using this method. Finally, monolayer graphene can be epitaxially grown on metal substrates via surface segregation of carbon from bulk of the substrates [6,7] or thermal decomposition of hydrocarbons at high temperatures. Graphene has been prepared on many metal surfaces, such as Ru(0001) [8] , Pt(111) [9] , and Ir(111) [10] .Up to now, studies on graphene mainly focus on its controlled preparation and physical properties. The surface chemistry of graphene remains to be explored. It is known that carbon materials can be used as catalysts supports [11,12] or catalysts [13][14][15] and, thus, play a critical role in many catalytic processes. Graphene is the building block for many carbon materials, including graphite, carbon nanotubes (CNTs), carbon nanofilaments (CNFs) and fullerene [16] . Studies in the surface chemistry and surface catalysis of graphene will contribute to fundamental understanding of the role of carbon in many important heterogeneous catalytic reactions.In the present work, monolayer graphene was prepared on Ru(0001) surface, and coverage of the graphene can be well controlled by the deposition process. The monolayer graphene/Ru(0001) has been successfully used as a periodic template for deposition of well ordered Pt nanoclusters, showing that the graphene serves as an ideal catalyst support to prepare metal/carbon model catalyst systems.

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Section: Resultsmentioning

confidence: 99%

Fabrication of metal nanoclusters on graphene grown on Ru(0001)

Zhang

Cui

et al. 2009

Chin. Sci. Bull.

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“…For higher carbon coverages, we repeat this dosing-heating cycle until no additional CO is emitted. Because the surface density of a monolayer of CO on Ru(0001) is well known (1:58 Á 10 19 sites per m 2 [9]), and because one monolayer of CO is known to correspond to 0.57 ML of adsorbed carbon [31,32], we can straightforwardly calibrate the amount of carbon present for each sample preparation. All samples used in this study had a surface coverage of 0:18 AE 0:02 of a ML of carbon.…”

Section: Methodsmentioning

confidence: 99%

Controlling CH 2 dissociation on Ru(0001) through surface site blocking by adsorbed hydrogen

Kirsch

Zhao

Ren

et al. 2014

Journal of Catalysis

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“…This still looks a reasonable and plausible mechanism; however, attention has been drawn to surface studies which show that CH 2(ad) loses H very readily, even at 200 K, well below the temperature of the F-T reactions, to generate the more stable triply coordinated surface methylidyne, CH (ad) [12][13][14]. It has therefore been suggested [15,16] that methylidyne is the chain carrier in the F-T reaction, and that chain growth occurs in two stages: a C-C coupling that is then followed by a separate hydrogen transfer step:…”

Section: Introductionmentioning

confidence: 99%