Polyaniline on Indium Tin-Oxide

One of the most important parameters of ITO, apart from the transparency, is the relatively high work function. In a comparative photoelectron spectroscopic study of ITO from different sources, and prepared by different techniques, a variation in the chemical composition and work functions are reported [101, 105]. For three carefully chosen types of ITO, the chemical composition and work 

Ultra-thin films of poly aniline may be spin-coated onto the ITO substrates. By studying thick films, spectra of the polymer itself are obtained. As the thickness of the polymer overlayer is reduced, some of the subtle details of the interface between the very thinnest possible polymer layer (essentially a mono-layer, in 

F re 5-21. N(ls) core level spectra of the imino model compound PC20X adsorbed on ITO. The upper curve corresponds to a thick fdm, the central curve to an intermediate thick film, and the lower curve to an ultra thin film, essentially a mono-layer in thickness. The bold solid lines are the fitted curves and the thin solid and dotted lines are the Gaussian peak components for physisorbed and chemisorbed PC20X, respectively. 

In summary, the results for the case of the polymer indicate that only the amino-nitrogens interacts with the ITO surface while the model studies demonstrates that both amino- and imino-groups reacts with ITO. Thus, further investigations are necessary in order to obtain a complete picture. Studies using model systems that contain the whole emeraldine base sequence have been initiated [114]. 

Some details of the electronic structure of a specific metal-on-polymer interface have been presented to illustrate the importance of such interfaces in determining 

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