Conducting carbon film

NOLTR 1111 (1952), p 3f5 0 describes a British innovation, under development in the USA since WWII, which uses as a bridge a conductive carbon film rather than a wire in a primer. The carbon bridge primer offers several advantages over the bridge wire. 

The second example of field emission of Si-based nanowires is that of B-doped Si nanochains [80]. The SiNCs were attached onto a Mo substrate by a conductive carbon film. The anode-sample separation ranges from 120 to 220 pm. The turn-on field was 6 V pm and smaller than that (15 V pm ) for the SiNWs. The field-emission characteristics of the SiNCs were analyzed according to the FN theory [81]. All the FN curves with different anode-sample separations fall in nearly the same region and have similar Y intercepts, showing that the SiNCs are uniformly distributed. A stability test showed no obvious degradation of current density and the fluctuation was within +15%, indicating that the B-doped SiNCs are a promising material for field emission applications. 

Polymeric Conducting Carbon Films Fundamentals, Structure, Properties, and Applications... 

Organic polymers are considered good precursors for preparing conducting carbon films having a polymeric structure. These precursors are generally divided into two... 

In conducting carbon films there is a juxtaposition of sp islands and an sp network that resembles the conjugated chain in a polymer (linear sp bond) with sp defects (o- defects as in a-Ge). In the case of high molecular weight and relatively few sp defects, even relatively weak interchain coupling is sufficient to avoid onedimensional localization. This phenomenon leads to coherent transport with a mean free path that is limited by the mean separation between chain imperfections or by phonon scattering. 

The electrical behavior of the highly conductive carbon film can be explained by the theory developed by Ramakrishnan et al. [69,80,81], in which a parameter called the characteristic length is important. The characteristic length on the localized side is given by the localization length of the wave function, whereas on the extended side signifies the scale at which the conductance becomes ohmic. 

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