Photoelectron spectroscopy of hydrogen at the polycrystalline diamond surface

Oxygen‐Terminated Nanocrystalline Diamond Film as an Efficient Anode in Photovoltaics

“…After hydroxylation, the OH-NCD C1s peak reveals an upshifted component at about 1.6 eV (component B) with respect to the bulk C1s peak, which can be assigned to the hydroxyl groups. [20][21][22][23][24] Figure 2a-iii shows the C1s spectrum of O-NCD, which shows chemically shifted components at 286.8 eV (component C) attributable to C¼O species on the diamond surface. [23,25,26] The relative oxygen content on the three diamond films with different terminations is illustrated in Figure 2b; the XPS O1s spectra show increasing amount of O-containing species for H-NCD, OH-NCD, and O-NCD, respectively.…”

“…[20][21][22][23][24] Figure 2a-iii shows the C1s spectrum of O-NCD, which shows chemically shifted components at 286.8 eV (component C) attributable to C¼O species on the diamond surface. [23,25,26] The relative oxygen content on the three diamond films with different terminations is illustrated in Figure 2b; the XPS O1s spectra show increasing amount of O-containing species for H-NCD, OH-NCD, and O-NCD, respectively. As shown in the ultraviolet photoelectron spectroscopy (UPS) image in Figure 3a, the photochemical hydroxylation process of H-NCD to OH-NCD results in a significant increase in work function, as judged by a narrowing of the spectral width.…”

Hydrogen termination of CVD diamond films by high-temperature annealing at atmospheric pressure

“…It is known that the hydrogenated diamond film exhibits upward band bending caused by surface Fermi level pinning. 17,18 This reduces the energy barrier for electron emission from the bulk C−C groups detected by XPS. Hence, the dominant peak is observed at a lower binding energy (∼284.0 eV) in Figs.…”

The Use of Conducting Diamond in Electrochemistry

“…It is clear from Figure 5.5 the dramatic effects changing growth conditions can have on crystallite morphology. The as-grown MC BDD material shows differently shaped crystal structures originating from the different crystal facets present: [100] cubic, [110] dodecahedral, and [111] octahedral (the preferred growth plane for diamond). Previous SEM studies have shown that secondary electron emission yields from BDD reach a maximum at boron concentrations of 10 19 -10 20 cm −3 , hence difference in SEM contrast can indicate differently boron-doped regions [64].…”

“…The largest component in the XPS spectra is found at ∼284.6 eV, attributed to the sp 3 C-C present in the diamond bulk; all other component peaks are given relative to this one. Higher binding energies are associated with carbon in the form of adsorbed hydrocarbons (+0.6 to +0.9 eV) and different forms of oxidation (e.g., alcohol (C-OH) and ether (C-O-C) (+1-2 eV), carbonyl >C=O (+2.9-3.8 eV), and carboxyl COOH (+3.7-4.3 eV)) [86,106,109,110]. Lower binding energy peaks (−1 to −2.1 eV) can be assigned to sp 2 C-C, where reconstruction of the diamond surface, especially at the polycrystalline grain boundaries may give rise to π-bonding.…”