Infrared ATR Spectroscopic Studies on Hydrated Tungsten Oxide Thin Films

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Abstract
The water absorption behavior of tungsten oxide films has been studied by infrared attenuated total reflection (ATR) spectroscopy. Our results indicate that most of the water in the film is present in the initial stage of deposition and hardly any water is added at greater thicknesses. It is also seen that the water content in decreases as the temperature of deposition increases. The spectra of thin films hydrated under controlled conditions have been studied, and new bands in the mid‐infrared region have been found. Thin Ag over‐ and underlayers have been used in order to enhance the IR absorption. The spectra of hydrated tungsten bronze and hydrated tungsten oxide in the presence of silver have been found to be similar.

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