Interaction of thermally activated and molecular oxygen with hydrogenated polycrystalline diamond surfaces studied by synchrotron radiation techniques

Laikhtman, A.; Hoffman, A.

doi:10.1016/s0039-6028(02)02409-3

Cited by 19 publications

(14 citation statements)

References 31 publications

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“…The shoulder, E 4 , is attributed to transitions from the C 1s level to unoccupied σ* antibonding states of H bonded to a diamond-like C atom and to hydrocarbon adsorbates (Graupner et al 1999;Laikhtman and Hoffman 2003;Ray et al 2004). A large variety of saturated hydrocarbons exhibit an ionization feature around 287.5 ± 0.3 eV (Graupner et al 1999 and references therein).…”

Section: Discussionmentioning

confidence: 99%

Surface electronic states of meteoritic nanodiamonds

Garvie

2006

Meteoritics &Amp; Planetary Science

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Abstract— The C K edge of Orgueil nanodiamonds (Cδ diamonds) was acquired by electron energy‐loss spectroscopy (EELS), with an energy resolution of 300 meV. The spectra show peaks at 282.5, 284.7, and 286.4 eV, which occur in the band gap below the main diamond edge and are absent from the bulk diamond spectrum. These peaks are attributed to transitions from C 1s surface core levels to unoccupied surface states, and arise from single and π‐bonded dangling bonds and C‐H bonds. A shoulder to the main absorption edge at 287.8 eV may correspond to hydrocarbon adsorbates. These results can be used to further our understanding of Cδ diamond structure and may reveal the presence of a fullerene‐like surface. The unique surface electronic states of the Cδ diamond surfaces are expected to affect their optical properties, which are dependent on features such as extent of H coverage, particle size, and surface structure.

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Section: Discussionmentioning

confidence: 99%

Surface electronic states of meteoritic nanodiamonds

Garvie

2006

Meteoritics &Amp; Planetary Science

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“…All three materials show different features in the so-called "pre-edge region" between 286 and 288 eV. Surface chemistry-specific absorption features attributed to C=O bonds at 286.5 eV [39,40] and C-H bonds at ≈287.3 eV [41,42] are present in this region. Both hydrogenated samples show an increase in C-H resonance compared to the oxidized starting material, indicating successful surface modification by both techniques.…”

Section: Nexafs Xps and Ftirmentioning

confidence: 93%

Fluorescence and Physico-Chemical Properties of Hydrogenated Detonation Nanodiamonds

Thalassinos

Stacey

Dontschuk

et al. 2020

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Hydrogenated detonation nanodiamonds are of great interest for emerging applications in areas from biology and medicine to lubrication. Here, we compare the two main hydrogenation techniques—annealing in hydrogen and plasma-assisted hydrogenation—for the creation of detonation nanodiamonds with a hydrogen terminated surface from the same starting material. Synchrotron-based soft X-ray spectroscopy, infrared absorption spectroscopy, and electron energy loss spectroscopy were employed to quantify diamond and non-diamond carbon contents and determine the surface chemistries of all samples. Dynamic light scattering was used to study the particles’ colloidal properties in water. For the first time, steady-state and time-resolved fluorescence spectroscopy analysis at temperatures from room temperature down to 10 K was performed to investigate the particles’ fluorescence properties. Our results show that both hydrogenation techniques produce hydrogenated detonation nanodiamonds with overall similar physico-chemical and fluorescence properties.

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“…In the case of the bare diamond surface, the C-H peak is still observed but with much lower intensity. Bearing in mind that the intensity of this peak continuously increased during accumulation of the spectrum and the fact that for the bare surface, neither H Ϫ in ESD measurements, nor H ϩ in photodesorption measurements were detected, 24,28 it can be attributed to adsorption of hydrocarbons which commonly takes place on diamond surfaces. 3,25 Exposure of hydrogenated and bare diamond surfaces to thermally activated oxygen results in different reaction products.…”

Section: Resultsmentioning

confidence: 97%

“…2͑b͒. 22,28 Let us consider first the hydrogen-free diamond surface. The O Ϫ ESD yield as a function of incident electron energy showed a strong resonance peak at 8.5 eV with two smaller peaks at 12 and 16 eV, and a monotonic increase toward higher incident energies.…”

Section: Resultsmentioning

confidence: 99%

Clarification of oxygen bonding on diamond surfaces by low energy electron stimulated desorption and high resolution electron energy loss spectroscopy

Laikhtman

Lafosse

Coat

et al. 2003

The Journal of Chemical Physics

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Articles you may be interested inTwo bonding configurations of acetylene on Si ( 001 ) -( 2 × 1 ) : A combined high-resolution electron energy loss spectroscopy and density functional theory study Mechanism of low-energy electron stimulated desorption of O − from hydrogenated and hydrogen-free diamond surfaces exposed to activated oxygen In this work we correlate between O Ϫ electron stimulated desorption ͑ESD͒ from hydrogenated and bare polycrystalline diamond films exposed to thermally activated oxygen for incident electron energies in the 4 -23 eV range and vibrational electron energy losses. By utilizing the previously established mechanism of low energy ESD of O Ϫ from diamond surfaces and high resolution electron energy loss spectroscopy carried out at an incident energy below the threshold for ion desorption, the surface bonding configuration of oxygen is discussed. Such analysis reveals formation of CvO and C-O-C bonds on the bare diamond surface, as well as some adsorbed CO molecules. The bonding configuration of the hydrogenated surface before and after exposure to oxygen is found to be dependent on the hydrogenation method: ex situ microwave plasma versus in situ treatment using a hot tungsten filament for gas activation. Oxygen-related features on the ex situ hydrogenated surface are attributed to formation of CvO and C-O-H bonds, whereas in situ hydrogen treatment retains some bare parts on the film surface where C-O-C bonds can be found alongside CvO and C-O-H.

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Interaction of thermally activated and molecular oxygen with hydrogenated polycrystalline diamond surfaces studied by synchrotron radiation techniques

Cited by 19 publications

References 31 publications

Surface electronic states of meteoritic nanodiamonds

Surface electronic states of meteoritic nanodiamonds

Fluorescence and Physico-Chemical Properties of Hydrogenated Detonation Nanodiamonds

Clarification of oxygen bonding on diamond surfaces by low energy electron stimulated desorption and high resolution electron energy loss spectroscopy

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