Examples of model bulk structures of (a) metal-free and [(b), (c), and (d)] metal (Me)-containing DLC: (a) 100% sp3-bonded DLC, [(b) and (c)] 1.5 at. % Me-DLC and (d) 3.0 at. % Me-DLC. Gray-, black- and red-shaded atoms represent sp3-bonded (four-fold coordinated) C, sp2-bonded (three-fold coordinated) C, and metallic inclusions, respectively.
Change in the sp3-bonded C, , as a function of the metal concentration [Me] in Ag- (green) and Cu- (red) containing DLC. The slope of the approximate linear fit to the results corresponds to 6.9% decrease in sp3-bonded C for 1% increase in metal content.
(a) Density of states of a fully sp3-bonded (red curve), and 83% sp3-bonded, Ag-containing (1.5 at. %) diamond-like carbon (green, shaded curve). (b) Degree of electronic state localization. Localization of signifies an extended wavefunction, whereas corresponds to a wavefunction that is localized on a single atom. The black and green lines correspond to all atoms and Ag only. The red dashed line marks the middle of the gap.
Absorption coefficient for metal-free (black line), and Al- (dashed line), Cu- and Ag- (solid lines) containing DLC. Different colors correspond to different content in sp3-bonded C (indicated as percentage on top of each family of curves) and metal. The peak of the solar spectrum ( = 550 nm) is marked with a vertical green, dashed line.
(a) Bulk K and (b) Young's Y modulus of metal-free (gray), and Ag- (red) and Cu- (green) containing DLC. Different symbols mark different content in sp3-bonded C in the unmodified (metal-free) DLC. A linear relationship describes the correlation between the content in sp3-bonded C and the elastic moduli.
Absorption coefficient of metal-free ([Me] = 0) and Al-, Cu- and Ag-containing ([Me] = 1.5, 3.0 at. %) diamond-like carbon for the wavelength of 550 nm.
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