Determination of Copper(I) and Copper(II) Oxides on a Copper Powder Surface by Diffuse Reflectance Infrared Fourier Transform Spectrometry

抄録

Diffuse reflectance infrared Fourier transform (DRIFT) spectrometry was applied to the determination of Cu₂O and CuO in Cu powders. The peak of Cu₂O (640cm^-1) and the shoulder of CuO (580-400cm^-1) were observed in the DRIFT spectrum of oxidized Cu powder. A linear relationship between the peak heights (640 and 520cm^-1) and the concentrations of copper oxide (Cu₂O and CuO) were obtained in concentration ranges of 0-16 and 0-6wt%, respectively. Analytical curves were constructed with three size-classified powders. From the slopes of the analytical curves, the effect of particle size of the powders on the spectrum is discussed. Two determination methods of Cu₂O and CuO in Cu powders are proposed. One is a method which uses the analytical curves. The other is a method which uses the oxygen concentration and the ratio of peak heights (640 and 520 cm^-1).