Synthesis of Nanosize‐Necked Structure α‐ and γ‐Fe₂O₃ and its Photocatalytic Activity

Abstract

Highly dispersed nanometer-sized a-Fe 2 O 3 (hematite) and c-Fe 2 O 3 (maghemite) iron oxide particles were synthesized by the combustion method. Ferric nitrate was used as a precursor. Xray diffractometer study revealed the phase purity of aand c-Fe 2 O 3 . Both the products were characterized using field emission scanning electron microscope and transmission electron microscope for particle size and morphology. Necked structure particle morphology was observed for the first time in both the iron oxides. The particle size was observed in the range of 25-55 nm. Photodecomposition of H 2 S for hydrogen generation was performed using aand c-Fe 2 O 3 . Good photocatalytic activity was obtained using aand c-Fe 2 O 3 as photocatalysts under visible light irradiation. P. Gouma-contributing editor

Hydrothermal Novel Synthesis of Neck-structured Hyperthermia-suitable Magnetic (Fe₃O₄, γ-Fe₂O₃ and α-Fe₂O₃) Nanoparticles

“…Although the neck-structured property of γ-Fe 2 O 3 and α-Fe 2 O 3 nanoparticles with photocatalytic activity synthesized by combustion method have already been reported by Apte et al [21] whereas we first time report the synthesis of neck-structured Fe 3 O 4 , γ-Fe 2 O 3 and α-Fe 2 O 3 nanoparticles with hyperthermia ability by simple hydrothermal decomposition.…”

Manganese and Zinc Spinel Ferrites Blended with Multi-Walled Carbon Nanotubes as Microwave Absorbing Materials

“…Such behavior is ascribed to surface effects in nanoparticles. The values of Ms of ZnFe2O4 particles was much higher than the bulk Ms values of 5 emu/g [37]. Such behavior is related to cation distribution, which can change from a normal spinel structure to a mixed spinel structure [28].…”

“…Figure 4 [36,37]. The peaks at 1380 and 1600 cm −1 are attributed to the C=O stretching modes, respectively, because of the coordination of the carboxylate groups of the citric acid by metal ions.…”

Effect of Process Parameters on Properties of Colloids in a Continuous‐Flow Microreactor System

“…Necked structure morphology of g-Fe 2 O 3 was obtained by Apte et al [38] from the combustion reaction of ferric nitrate. Conventional batch methodology techniques reported for production of nanoparticles generate the large-size particles with wide size distribution due to the lack of precise control on mixing, nucleation, and growth process during the particle formation [39].…”