Synthesis of Carbynoid Structures by the Combustion Flame Method - Polyynes: Synthesis, Properties, and Applications - page 83

FIGURE 5.4 SEM image and Raman spectrum of diamond film obtained by the
combustion flame method; ¼ 1.05.

5.3.1.3 Carbon Film Deposited at s ¼ 1.05

The carbon films obtained were diamond crystals (Figure 5.4(a)). The
diamond crystals present predominantly a (111) facet. Raman spectrum of
the film is shown in Figure 5.4(b). The sharp peaks due to diamond detected
at 1335 cm 1 showed the good quality of diamond. The average crystal size
is about 10 m m. The influence of the ratio of acetylene to oxygen and of
substrate temperature on the qualities and orientation of diamond have
been discussed in a previous paper [33].

5.3.2 R AMAN S PECTROSCOPY A NALYSIS

To confirm these observations, the carbon deposited films were analyzed by
Raman spectroscopy.

5.3.2.1 Carbon Film Deposited at s ¼ 1.15

The Raman spectrum of the carbon film shown in Figure 5.5(b) present a

peak near 1445 cm 1 assigned to carbon-carbon double bonds and a broad