Chemie der oberfläche des diamanten—II. Bildung, eigenschaften und struktur der oberflächenoxide

Sappok, R.; Boehm, H. P.

doi:10.1016/0008-6223(68)90001-8

Cited by 56 publications

(9 citation statements)

References 14 publications

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“…Matsumoto et al 32 also observed an ether group mode at 1280 cm-1 while Sappok and Boehm 30 reported two modes of an ether group formed by reaction with oxygen at 1270 and 1120 cm-1 . Each of the spectra reported by Sappok and Boehm also have a very broad absorption feature with local maxima near 1090 and 1120 cm-1 which were also assigned to an ether structure, 30 rather than to OH(a) as would be suggested by our assignments. Since the base pressure in the apparatus of Sappok and Boehm 3 0 was no better than 10-5 to 10-6 Torr, it seems quite possible that their samples reacted inadvertently with water upon heating, forming surface hydroxyl groups.…”

Section: B Water Adsorptionsupporting

confidence: 66%

“…Sappok and Boehm 30 and Matsumoto et a/. 32 observed a 1760-1800 cm-1 carbonyl stretching mode on oxidized diamond powder.…”

Section: B Water Adsorptionmentioning

confidence: 96%

“…In two infrared spectroscopic studies of the adsorption of oxygen and water on diamond powder, evidence was seen for formation of surface oxide species. 30 , 3 1 CO desorption peaks near 820 and 1070 K and a C02 desorption peak near 770 K were observed by TPD following exposure of diamond powder to oxygen or water, 32 suggesting multiple surface structures. However, diamond powder is terminated by various crystal faces with unspecified relative areas, making structural and kinetic analysis very difficult.…”

Section: Introductionmentioning

confidence: 95%

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Interaction of hydrogen and water with diamond (100): Infrared spectroscopy

Struck¹,

D'Evelyn²

1993

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Reproduction, in whole or in part, is permitted for any purpose of the United States Government.This document has been approved for public release and sale; its distribution is unlimited. 12 28 048 SREPORT DOCUMENTATION PAGEForm Approved II OMB No. 0704-0188 P•Joc' recr•t'-i uroen for this collection of information s •estimated to average I hour Oer response. including the time for reviewing instructliort . searching existing data sOurces gathe-ra and maintainrng the data needed, and completing and reviening the collection of information. Approved for public release; distribution is unlimited. ABSTRACT (Maximum 200 words)We report the first investigation of the adsorption of deuterium and water on diamond (100) by infrared multiple-internal-reflection spectroscopy using a natural type iHa diamond internal reflection element. Infrared evidence was seen for the monohydride surface structure, with one hydrogen atom per surface carbon atom (Sc1D mode at 901 cm-l), while the dihydride (CD2) structure was not observed. Following exposure to water at elevated temperature, infrared absorption features were detected at 1280, 1200, 1125, 1080, and 720 cm-1 , and are assigned to ether (C-O-C), hydroxyl (C-OH), and carbonyl (>C=O) modes. The substantial observed reactivity of diamond with water indicates a potentially important role for surface hydroxyl and oxide species in the surface chemistry and morphological development of CVD diamond films.14. AbstractWe report the first investigation of the adsorption of water on diamond (100) by infrared multiple-internal-reflection spectroscopy, using a natural type Ha diamond internal reflection element. Infrared spectroscopic results on the adsorption of atomic deuterium are also presented.

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Section: B Water Adsorptionsupporting

confidence: 66%

“…Sappok and Boehm 30 and Matsumoto et a/. 32 observed a 1760-1800 cm-1 carbonyl stretching mode on oxidized diamond powder.…”

Section: B Water Adsorptionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 95%

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Interaction of hydrogen and water with diamond (100): Infrared spectroscopy

Struck¹,

D'Evelyn²

1993

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…Consequently, application of the BET equation to the adsorption isotherm yields the quantity of water adsorbed on the hydrophilic centers as "mono- [446], [501] a Outgassed at 423 K b Outgassed at 413 K layer capacity". It was shown that this quantity agrees very well with the quantity of active hydrogen determined by deuterium exchange or by the Zerewitinoff method of diamond powder [446,498,499], for silicon carbide [446,500] or for Aerosil silica.…”

Section: A) Adsorption Of Water On Hydrophilic Adsorption Centersmentioning

confidence: 65%

Nature and Estimation of Functional Groups on Solid Surfaces

Boehm

Knözinger

1983

Catalysis

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“…We terminated the surface of each carbon material with H atoms using the best-known methods. While oxygen-terminated diamond surfaces have been used as a starting point for surface functionalization, − oxidation of diamond typically produces multiple types of oxidized species at the surface and can increase the graphite content, thus diminishing the diamond-specific properties for some applications. Therefore, we use hydrogenated surfaces as a foundation in our study to perform radical coupling.…”

Section: Methodsmentioning

confidence: 99%

Molecular Surface Functionalization of Carbon Materials via Radical-Induced Grafting of Terminal Alkenes

et al. 2019

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Formation of functional monolayers on surfaces of carbon materials is inherently difficult because of the high bond strength of carbon and because common pathways such as SN2 mechanisms cannot take place at surfaces of solid materials. Here, we show that the radical initiators can selectively abstract H atoms from H-terminated carbon surfaces, initiating regioselective grafting of terminal alkenes to surfaces of diamond, glassy carbon, and polymeric carbon dots. Nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS) demonstrate formation of self-terminating organic monolayers linked via the terminal C atom of 1-alkenes. Density functional theory (DFT) calculations suggest that this selectivity is at least partially thermodynamic in origin, as significantly less energy is needed to abstract H atoms from carbon surfaces as compared to typical aliphatic compounds. The regioselectivity favoring binding to the terminal C atom of the reactant alkenes arises from steric hindrance encountered in bond formation at the adjacent carbon atom. Our results demonstrate that carbon surface radical chemistry yields a versatile, selective, and scalable approach to monolayer formation on H-terminated carbon surfaces and provide mechanistic insights into the surface selectivity and regioselectivity of molecular grafting.

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Chemie der oberfläche des diamanten—II. Bildung, eigenschaften und struktur der oberflächenoxide

Cited by 56 publications

References 14 publications

Interaction of hydrogen and water with diamond (100): Infrared spectroscopy

Interaction of hydrogen and water with diamond (100): Infrared spectroscopy

Nature and Estimation of Functional Groups on Solid Surfaces

Molecular Surface Functionalization of Carbon Materials via Radical-Induced Grafting of Terminal Alkenes

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