Characterization coating deposition methods

In this chapter, some of the applications of ceramic films and coatings have been discussed, along with the properties and characterization methods important to those applications. Common deposition methods for ceramic films have been... 

Photovoltaic response parameters for electrodeposited (polycrystalline) CdTe thin film electrodes in sulfide-polysulfide or alkaline sodium telluride PEC have been reported, primarily with no reference to the stability of the cells [100], In view of the instability of CdTe in aqueous solutions, Bhattacharya and Rajeshwar [101] employed two methods for the characterization of their electrodeposited CdTe-based PEC. In the first one, a coating of Pb02 (-100 nm thick) was deposited on the CdTe film surface by electroless deposition, and the coated films... 

A method for coating microchannel walls with layers as thick as 25 pm was developed by Stefanescu et al. [181]. The microreactor was built from FeCrAl (Aluchrom ). The metal surface was first chemically treated in several steps and afterward annealed at 1200 °C for 1 h to trigger the segregation of aluminum and the formation of an alumina layer on the metallic surface. An alumina washcoat was subsequently deposited from a slurry onto the microstructure and characterized by various physical methods. The authors varied the properties such as viscosity, particle size, and pH of the slurry. Acrylic acid, a component used as dispersant and binder, was found to be particularly important for the adhesion of the alumina layer. 

Meille et al. [127] described in detail a hybrid sol-gel/suspension method for coating silicon structures with alumina. Because the channel sizes were very small, the deposited layers were not to exceed 1 pm in thickness. Therefore, the authors used suspensions with particle sizes in the nanometer range and low concentrations (between 0.5 and 5 wt%). An acidic suspension of boehmite was prepared. The boehmite dissolves partially and forms Al-O-Al polymers, which help to anchor the particles to the surface. The resultant layers were subsequently characterized and impregnated with platinum acetylacetonate. 

Thin films of transition metal molybdates, with general formula MM0O4 where M = Co, Ni Cu and Fe, were prepared by the citrate method and deposited by spin-coating on a Si (100) substrate. All characterization data indicated that Co, Ni, and Cu-systems behaved as expected and pure phases P-C0M0O4, a-NIMo04 and a-CuMo04, respectively, were obtained without any... 

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