Photochemical effect on diamond film surfaces induced by extended exposure to UV light

Friction anisotropy in boronated graphite

“…Further, the peaks at 1462 and 1105 cm −1 correspond to C C aromatic stretching and deformation mode of O CH basal phenolic group, respectively [44,45]. Peak at 778 cm −1 is attributed to out of plane bending vibration of graphite like carbon present in both the direction of BG surface and it is also observed in corresponding wear tracks [44,46]. A broad band at 1610 cm −1 is assigned to sp 2 C C hybridized (C C) bonding.…”

“…Basal face of BG sample (Fig. 12a) showed several absorption bands between 1000 and 2300 cm −1 designated as C O C stretching vibrations and C O group [43][44][45]. These bands are rather strong in the BG surface of prismatic plane (Fig.…”

“…12b and d). Their presumed origins are * C O and * C O resonances arising from oxidative reactions of surface defects [44,46]. Absorption band appearing at 1644 cm −1 is due to the presence of molecular water.…”

Anisotrpic friction behavior of charcoal and the influence of humidity

“…This confirms that carboxylic groups contribute toward formation of aromatic ring of carbon due to oxidation of liquid phase. Absorption bands at 2969 and 3008 cm À 1 correspond to C-H 2 and C-H 3 aliphatic stretching vibrations, respectively [37]. In order to determine the aromaticity factor, C-H 2 and C-H 3 contribution were obtained from de-convolution.…”

Ultraviolet stimulated photocatalytic activity on polycrystalline diamond film surfaces

“…The role of oxygen radicals, such as ozone (O 3 ) and atomic oxygen ͑O*͒ on the photocatalytic reaction is discussed, as well. 8 Diamond films with a low NDC content were synthesized by rf-assisted CVD technique at 900°C by using 2% of pure methane in hydrogen gases, as reactants. Diamond films 2 m thick were obtained after 2 h. The experimental details as well as the information on the experimental setup have been published elsewhere.…”