Plasma-enhanced chemical vapor deposition PE-CVD

Exxon Mobil Type 3155 Polypropylene with a melt flow rate of 36g/10min, density of 0.9g/cm, and molecular weight distribution of 2.8, was utilized as the matrix. MWNTs were supplied by Nano-Lab (Newton, MA). These nanotubes (with purity > 95%) were produced via plasma-enhanced chemical vapor deposition (PE-CVD) using acetylene and ammonia with iron catalyst particles on a mesoporous silica substrate." The diameter is specified as 20-50 nm with lengths ranging between 5 and 20 pm. 

Nowadays research efforts are mainly directed to the synthesis of microporous and dense inorganic membranes. The multilayer casting method based on sol-gel technology is not the sole approach for the preparation of these membranes. CVD and hydrothermal synthesis are currently used as well as the sol-gel process. CVI (chemical vapor infiltration) for support infiltrated membranes, PE-CVD (plasma enhanced chemical vapor deposition) for surface modification of existing membranes, growing of zeolite membrane layers, pyrolysis of polymeric preciusors have been described as alternative preparation methods... 

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