Evidence for trans-polyacetylene in nanocrystalline diamond films from H–D isotropic substitution experiments

Abstract

Competition of nitrogen doping and graphitization effect for field electron emission from nanocrystalline diamond films J.

Characterization of boron doped diamond electrodes during oxidation processes: Relationship between electrochemical activity and ageing time

“…The wide band located at about 1200 cm − 1 has been previously attributed to reticular distortion or q ≠ 0 phonons contribution activated by disorder [7,8] and to the presence of diamond nanocrystallites in the bulk of the sample [9,10]. However, this peak can be also related to the contribution of trans-polyacetylene segments at grain boundaries and surfaces [ [11][12][13]. The peak at about 1500 cm − 1 has been attributed to the G mode of disordered carbon [7,14].…”

Synthesis and structural characterization of highly 〈100〉-oriented {100}-faceted nanocrystalline diamond films by microwave plasma chemical vapor deposition

“…Besides the sharp diamond peak, a broad band centered around 1500 cm À1 is also observed in the visible Raman spectrum. This broad band is typically attributed to the presence of graphitic carbon [23]. When exciting the Raman spectrum with a 325 nm He-Cd ultraviolet (UV) laser, the visible luminescence background is greatly diminished and thus the diamond peak looks more prominent.…”

“…When exciting the Raman spectrum with a 325 nm He-Cd ultraviolet (UV) laser, the visible luminescence background is greatly diminished and thus the diamond peak looks more prominent. The graphitic carbon component in the sample becomes easier to distinguish: the appearance of two broad bands centered at around 1350 and 1580 cm À1 , are ascribed to the D-and G-band of graphite, respectively [23].…”

High Young’s modulus in ultra thin nanocrystalline diamond

“…The final feature of films grown with increased methane is the appearance of a peak at 1120 cm À1 which is always accompanied by a second feature at 1450 cm À1 . This pair of features has been ascribed to hydrogen/sp 2 at grain boundaries [26,27]. In Fig.…”