Carbon Material with a Highly Ordered Linear-Chain Structure - Polyynes: Synthesis, Properties, and Applications - page 214

FIGURE 11.1 Electron diffraction patterns of the linear chain carbon films (a-c),
the distribution of electron diffraction intensity, its atomic arrangement (g), the
Langmuir-Blodgett multi-layered film diffraction patterns (d,e).

to 0.507 nm and indicates a high degree of ordering in the film. The dis-
tribution of electron diffraction intensity shown in Figure 11.1(f) reveals
the specific features of the diffraction patterns obtained. There is strong
attenuation of higher-order reflections, so that the intensity of the second-
order reflections is decreased by an order of magnitude compared to the
first-order reflections. This can be attributed to the layered structure of the
film with small ( 0.09 nm) random displacements between the layers that

the film consists of [9]. Similar diffraction patterns and inter-plane spacing
in the range of 0.4-0.5 nm can be observed in a multi-layered film prepared
by the Langmuir-Blodgett (LB) method (Figure 11.1(d)). The LB film
consists of chain-like organic molecules C 15 H 32 O 2 oriented normally with
respect to film surface. These layers are assembled into hexagonally ordered
layers by the weak van der Waals forces. As a result, one-axis texture
in the diffraction pattern similar to that mentioned above is observed
(Figure 11.1(e)). It should be noted that inter-plane spacing in the range
between 0.412 and 0.456 nm is a characteristic feature of only one known
carbon form, that is carbyne with the sp 1 type of electron hybridization of
carbon atoms. Thus, the atomic structure of Tetracarbon TM is thought to
be similar to the LB films with the two-dimensional ordered layered chain
structure.
Highly oriented carbon films of high quality were also deposited by the
ion-assisted condensation method in nitrogen-containing glow discharge at