Poly , metal deposition

A. Stoyanova and V. Tsakova, Copper-modified poly(3,4-ethylenedioxythiophene) layers for selective determination of dopamine in the presence of ascorbic acid II Role of the characteristics of the metal deposit. J. Solid State Electrochem. (2010), in press. 

Poly(ethylene terephthalate) semicrystalline films have been metallized with Al and Cu by using Knudsen effusion cells. During the metal deposition, the surface was characterized by static SIMS. The secondary ions characteristics of the polymer and the new contributions produced by the metal and metal-polymer fragments were followed as a function of the deposition time. It is observed that the binetlcs is very different for the two metals it is faster for Al as compared to Cu. After an Al deposition... 

The formation and growth of an electrodeposited phase is a complex process and many methods have been used to study it. The main feature of our laboratory scientific investigations is intensive study of the structure of poly- and monocrystalline refractory metal deposits, such as tungsten, molybdenum, rhenium, iridium, ruthenium and etc. We have shown that the structure of electrodeposited layers directly depends on the conditions of electrolysis [1]. Moreover this structures a most sensitive instrument to study the properties of our electrolyte, including purity of the melt, ion composition, dissipative ability, and kinetic parameters of electrodeposition. It was established that the reduction of oxygen in a chloride melt changed the direction of molybdenum growth texture from <111> to <001 > direction with a fine structure of epitaxial layers [2]. 

Liu et al. (2012) reported that photoresist effectively covered and insulated noble metal deposited onto a poly-Si layer. Poly-Si was well protected for >80 min in concentrated HF solutions by a 3-pm-thick AZ 6130 photoresist film. 

The beater additive process starts with a very dilute aqueous slurry of fibrous nitrocellulose, kraft process woodpulp, and a stabilizer such as diphenylamine in a felting tank. A solution of resin such as poly(vinyl acetate) is added to the slurry of these components. The next step, felting, involves use of a fine metal screen in the shape of the inner dimensions of the final molded part. The screen is lowered into the slurry. A vacuum is appHed which causes the fibrous materials to be deposited on the form. The form is pulled out after a required thickness of felt is deposited, and the wet, low density felt removed from the form. The felt is then molded in a matched metal mold by the appHcation of heat and pressure which serves to remove moisture, set the resin, and press the fibers into near final shape (180—182). 

When undiluted 2-vinylfuran was added to metallic sodium (mirror or particles) an orange colour developed and some resinous material was deposited on the metal surface. On prolonged contact much of the monomer was converted into a partly-insoluble reddish resin with spectra unrelated to those of standard poly(2-vinyl-furan). Reaction of diluted monomer with sodium gave a milder interaction, but no evidence of living anionic polymerization. 

Characteristics of Tin Oxide Thin Films on a Poly Ethylene Terephthalate Substrate Prepared by Electron Cyclotron Resonance-Metal Organic Chemical Vapor Deposition... 

The Cr(CN-[P])g and Ni(CN-[P]) complexes of 2 have been prepared as well under macroscale conditions. 100 - 200 mg of metal were deposited typically into a blend of 2 in a poly(dimethylsilox-ane) at 270 K [normally - 10 ml of 2 in 40 ml of diluent]. The products for each metal were dark orange, viscous oils which gave IR and uv-visible spectra in good agreement with those obtained from the matrix experiments. 

In a typical reaction 100 - 200 mg of metal [Cr or Ni] was evaporated from a preformed alumina crucible over a period of 60 - 90 min and deposited into a mixture of 2 in poly(dimethylsiloxane) [Petrarch Systems 0.1 P.] within a rotary solution metal vapor reactor operating at 10 4 torr. The reaction flask was cooled to approximately 270 K by an iced-water bath. For a description of the apparatus see Chapter 3 of reference 4. The product in each case was a dark orange viscous liquid and was characterized as obtained from the reaction vessel. 

---