Abstract
Three infrared spectroscopic methods—photoacoustic, diffuse reflectance and transmission—were evaluated for the qualitative analysis of carbon fibres. Transmission spectra of a potassium bromide (KBr) pellet detect the bulk of a carbon fibre, and are subject to interference by water in the KBr pellet. Extensive dehydration of a KBr pellet at elevated temperatures may cause chemical changes. In contrast, photoacoustic and diffuse reflectance methods are free of water interference. Both methods differentiate the near-surface region of a carbon fibre from its bulk, thus providing information about chemical structures in the near-surface. The photoacoustic, diffuse reflectance and transmission infrared spectra of a carbon fibre have similar band frequencies. Therefore diffuse reflectance and photoacoustic methods can be used for reliable qualitative analysis of carbon fibres.
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