In situ laser‐induced formation of α‐Fe₂O₃ from Fe³⁺ ions in a cylindrical core‐shell polymer brush

Abstract

The Raman spectrum of a cylindrical core-shell polymer brush containing Fe 3+ ions was measured in a confocal spectrometer equipped with an He-Ne laser. During irradiation, the polymer matrix decomposed, and carbonaceous compounds containing sp 2 and sp 3 hybridized carbon were formed. Simultaneously, the strong and narrow Raman lines of crystalline a-Fe 2 O 3 (hematite) began to show up in the spectrum. After prolonged irradiation, the carbon signals decreased, whereas the hematite peaks remained strong. Similar experiments with the same polymer containing Cu 2+ ions resulted only in very weak formation of cupric oxide.

Dramatic enhancement of catalytic activity over transition metal substituted hematite

“…6), the BE of O 1s (529.7 eV) and Fe 2p (710.8 eV) were lowered as compared to those of S1. Generally Co 2p 3/2 was observed at 780 eV for CoO [50], but we have found the same spectra at 780.2 eV. The shifting again confirms the substituition of Co and there is formation of its mixed oxide.…”

Fabrication of iron-cerium mixed oxide: an efficient photocatalyst for dye degradation

“…According to Weber et al the first peak is due to F 2g mode of the ceria cubic lattice (Weber et al, 1993). Similarly for Fe 2 O 3, three bands were observed at 282 and 1067 cm -1 for hematite and 713 cm -1 is for maghemite (Leon et al, 2004). Shifting of peaks by some units from their original value of parent material from references, ascertains the formation of mixed oxide between Fe 2 O 3 and CeO 2 .…”

Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

“…Previous studies (Bersani et al, 2000;Zoppi et al, 2010) showed that the bands appearing at 220, 290, 403, 500, 609, 650 cm -1 were commonly assigned to hematite. However, the band at 650 cm -1 is usually a low-intensity signal and the literature (León et al, 2004) reported that it was not the spectrum of a perfect hematite due to the lack of longrange order. On the other hand, earlier work (Buciuman et al, 1999;Hong et al, 2011) confirmed that the Raman spectrum of the MnO 2 appear in the range of 580-650 cm -1 .…”