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Coatings Technology Handbook Episode 3 Part 3

Tham khảo tài liệu 'coatings technology handbook episode 3 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Conductive Coatings 91-5 A new class of low-dimensional materials for example polymeric metallophthalo-cyanines with such metals as aluminum chromium tin and gallium at the center of the ring has been synthesized and made conducting 1 Q-cm -1 by halogen doping partial oxidation .34 35 Various transition metal ions have been coordinated with conjugated ligands to synthesize polymers with metal ions within the main chain.36 Ligands such as tetrathiosquarate tetrathionaphthalene tetrathiafulvalene and tetrathiooxalate have been used. The tetrathiooxalate complexed with nickel ions gave linear polynickel tetrathiooxalate oligomers with conductivities as high as 20 Q-cm . A completely different approach to depositing conducting organometallic coatings involves the use of a low-pressure plasma LPP environment. The LPP environment may be used to deposit a polymeric organometallic coating or powder from organometallic monomers 37-42 or it may be used to convert a deposited organometallic coating into a metallic one.20 43 44 The metals introduced in the organometallic coatings by LPP organometallic monomers were iron tin mercury tantalum lead bismuth and metal coatings by the LPP posttreatment were gold platinum palladium silver and lead. The generation of metal surface coatings from certain organometallic coatings can be also achieved by thermal means controlled pyrolysis .20 The advantage of the LPP process is that it permits a metallic coating to be formed on a heat-sensitive substrate without the use of elevated temperatures. The process also permits formation of adhering gold and platinum coatings otherwise difficult to deposit on plastic substrates. None of the conducting organometallic coatings or their deposition processes have gone beyond the research stage. However the conducting organometallic coatings effort is very new compared with the other types mentioned before. 91.3 Commercially Available Conductive Coatings Whereas the metallized plastics effort is a .