STM and ESCA studies of palladium particles deposited on a HOPG surface

Sartre, A.; Phaner, M.; Porte, L.; Sauvion, G.N.

doi:10.1016/0169-4332(93)90465-n

Cited by 43 publications

(22 citation statements)

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“…2b). These stuctures are well documented and are due to functionality groups created on the graphite surface by oxidation [3,4]. One can also notice that the structure at 5.5 eV on the high binding energy side of C Is peak is less intense after oxidation proce8s.…”

Section: X-ray Phooelectron Spectroscopymentioning

confidence: 68%

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Oxidation Studies of the Graphite Surface by Scanning Tunneling Microscopy and Photoelectron Spectroscopy

et al. 1994

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Scanning tunneling microscopy and spectroscopy and X-ray photoelectron spectroscopy were used to study oxidation effects of nitric acid on highly oriented pyrolytic graphite surface. This treatment was performed at different temperatures and etching times with the aim of realizing local binding sites on the surface without creating deep defects. Then these three technics were found in good agreement to characterize the weakly oxidized surface. A wavy structure different from pure graphite at atomic scale was imaged by scanning tunneling microscopy. This modification was correlated to the presence of carboxylic groups on the surface revealed by X-ray photoelectron spectroscopy. Both spectroscopies of scanning tunneling and X-ray photoelectron demonstrated the vanishing of π bands characteristic from sp2 graphitic hybridization. This was attributed to dehybridization corresponding to new bondings of the graphite carbons in the carboxylic groups.

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Section: X-ray Phooelectron Spectroscopymentioning

confidence: 68%

“…This is a standard procedure to create active sites on the graphite surface for catalytic purpose [1,3,4]. Two different etching temperatures (20°C and 70°C) and different etching times were used.…”

Section: Methodsmentioning

confidence: 99%

Oxidation Studies of the Graphite Surface by Scanning Tunneling Microscopy and Photoelectron Spectroscopy

et al. 1994

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“…For this reason it is difficult to observe surface modification on the atomic length scale. In early studies [1][2][3][4][5] scanning tunneling microscopy (STM) technique was used to characterize an oxidization process. The studies showed that the oxidization process was not uniform even at small areas.…”

Section: Introductionmentioning

confidence: 99%

Topographic and Energetic Heterogeneity Studies of Oxidized Graphite Surface by Scanning Tunneling Microscopy/Spectroscopy and Photoelectron Spectroscopy

Klusek

1997

Acta Phys. Pol. A

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Scanning tunneling microscopy and spectroscopy and X-ray photoelectron spectroscopy are used to study oxidation effects of nitric acid on a highly-oriented pyrolytic graphite surface. Various etching times at constant temperature are applied in order to create local binding sites on the surface without creating deep defects. A single and paired chains structure, different from pure graphite at atomic scale, is shown by scanning tunneling microscopy. This can be explained by the presence of oxygenate groups on the surface, revealed by X-ray photoelectron spectroscopy. Both scanning tunneling spectroscopy and X-ray photoelectron spectroscopy demonstrate the vanishing of a bands characteristic of sp2 graphite hybridization. This, in turn, can be explained by dehybridization related to new bondings of the graphite carbons in the oxygenate groups. An important result of area averaging spectroscopy is the observed energetic heterogeneity considered in terms of the changes of local electronic density of states of the oxidized surface.

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“…The graphite surface was chosen as carbon surface for its very low edge-to-basal site ratio. The presence of these defects was demonstrated in a previous study [6], thus in this paper we investigated the very first oxidation step of graphite to promote these anchoring atomic sites at the expense of physical defects and try to preserve the graphite basal plane flatness. A typical XPS survey spectrum obtained from an HOPG surface after an oxidation treatment is presented figure 1.…”

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Soft oxidation of graphite studied by XPS and STM

Phaner‐Goutorbe

Sartre

Porte

1994

Microsc. Microanal. Microstruct.

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Abstract. 2014 The modification of the graphite surface after weak oxidation using a nitric acid solution has been studied by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). A new corrugation at the atomic scale has been revealed by STM on the basal planes. It is attributed to the presence, in other respects demonstrated by XPS, of some oxygenated groups created by oxidation and regularly distributed on the surface. This soft oxidation conserves the graphite basal planes and is interpreted by an oxygen chemisorption on graphite through a bond involving 03C0 electrons of the aromatic cell. Organic groups which need dangling 03C3 bonds to fix on the surface should preferencially attach on ridges of large defects.Microsc. Microanal. Microstruct. 5 (1994)

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STM and ESCA studies of palladium particles deposited on a HOPG surface

Cited by 43 publications

References 10 publications

Oxidation Studies of the Graphite Surface by Scanning Tunneling Microscopy and Photoelectron Spectroscopy

Oxidation Studies of the Graphite Surface by Scanning Tunneling Microscopy and Photoelectron Spectroscopy

Topographic and Energetic Heterogeneity Studies of Oxidized Graphite Surface by Scanning Tunneling Microscopy/Spectroscopy and Photoelectron Spectroscopy

Soft oxidation of graphite studied by XPS and STM

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