Infrared Reflection Studies of the Oxidation of Copper and Iron

Abstract

Infrared multiple reflectance spectra were used to record the growth of oxide films on copper and iron mirrors. Cuprous oxide and cupric oxide films were readily distinguished since they exhibit intense single bands at 640 cm -1 and ~560 cm -1, respectively. Iron oxide films of a single composition also exhibit highly characteristic bands in the 230 to 1100 cm -i region of the reflectance spectra. Spectra of mixed iron oxide films were composed of many highly overlapping bands making quantitative interpretations difficult. The intensities of the infrared bands from the copper oxide and iron oxide films were directly proportional to the oxide film thicknesses. Using a seven reflection-73 ~ incidence optical accessory, sensitivity to detect oxide films as thin as about 5A was achieved.

In situ synchrotron far infrared micro-spectroelectrochemistry with a grazing angle objective

“…The bands are broad presumably because of structural disorder and because they are a convolution of several bands [2]. The band widths are, however, similar to those measured by Poling [11] and Narang [12] on standard and more ordered samples of CuO. The bands we observed here are in good agreement with our previous work on reflectance measurements on large (conventional) electrodes [2].…”

“…The resolution of the bands appears lower than what we have observed before. The first 3 bands are strongly indicative of the presence of CuO [2,11,12]; that at 607 cm À1 is probably due to some Cu(OH) 2 . The band at 187 cm À1 has also a contribution in intensity due to water [9].…”

Surface oxidation control of nanosized magnetite and Mössbauer measurements

“…The phase characterization of the different samples has also been confirmed by IR measurements. The typical split band of maghemite (580 and 630 cm −1 ) [7] is well observed in the IR spectrum of the Mag 2 sample, whereas the spectra of the samples Mag 1 and Mag 3 show predominantly the magnetite band at 580 cm −1 , with a small side band for the Mag 1 sample.…”

Synthesis and characterization of maghemite iron oxide (γ-Fe2O3) nanofibers: novel semiconductor with magnetic feature

“…As shown in Fig. 5b, the characteristic peaks indicating the formation of c-Fe 2 O 3 can be clearly observed at 700, 640-620, 580, 560, 540, 460, 430, and 390 cm -1 [38]. Magnetite iron oxide (Fe 3 O 4 ) can be distinguished in the FT-IR spectra via its strong peaks which appear at 1426, 1520, and 1635 cm -1 [39], that these peaks cannot be detected in the obtained results.…”