## filamentous carbon

https://doi.org/10.1351/goldbook.F02362
A carbonaceous deposit from gaseous carbon compounds, consisting of filaments grown by the catalytic action of metal particles.
Note:
In general, such deposits are obtained at pressures of $$<100\ \text{kPa}$$ in the temperature region $$600-1300\ \text{K}$$ on metals such as iron, cobalt or nickel. Typical filaments consist of a duplex structure, a relatively @O04362@-resistant skin surrounding a more easily oxidizable core, with a metal particle located at the growing end of the filament. They generally range from $$0.01$$ to $$0.5\ \unicode[Times]{x3BC}\text{m}$$ in diameter and up to $$10\ \unicode[Times]{x3BC}\text{m}$$ in length. In some systems, the metal particles are located in the middle of the filaments, and there are also examples where several filaments originate from a single particle. The filaments may be produced in different conformations, such as helical, twisted and straight.
Source:
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 488 (https://doi.org/10.1351/pac199567030473)