Modification using additional NaOH for the preparation of γ‐Fe2O3 nanoparticles by chemically induced transition. (1st November 2014)

• Record Type: Journal Article
• Authors: Mao, Hong; Li, Jian; Chen, Longlong; Lin, Yueqiang; Liu, Xiaodong; Li, Junming; Gong, Xiaomin; Li, Decai
• Is Part Of: Micro & nano letters. Volume 9:Number 11(2014)
• Page Start: 782
• Page End: 786
• Publication Date: 2014-11-01
• Subjects: iron compounds -- nanoparticles -- nanofabrication -- magnetometry -- transmission electron microscopy -- X‐ray diffraction -- X‐ray chemical analysis -- X‐ray photoelectron spectra -- epitaxial growth -- crystallites -- magnetisation; nanoparticle preparation -- chemically induced transition -- reaction solution -- alkalinity effect -- vibrating sample magnetometry -- transmission electron microscopy -- TEM -- X‐ray diffraction -- XRD -- energy‐dispersive X‐ray spectroscopy -- EDX -- X‐ray photoelectron spectroscopy -- XPS -- epitaxial growth -- crystallites -- apparent specific magnetisation -- NaOH concentration -- Fe2O3−FeCl3H2O; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2014.0410
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : γ‐Fe2 O3 nanoparticles coated with a layer of FeCl3 ·6H2 O were prepared by chemically induced transition in FeCl2 solution. NaOH was added to the reaction solution, to investigate the effect of alkalinity on the resulting particles. Vibrating sample magnetometry, transmission electron microscopy, X‐ray diffraction, energy‐dispersive X‐ray spectroscopy and X‐ray photoelectron spectroscopy were used to characterise the products. Additional NaOH stimulated the epitaxial growth of γ‐Fe2 O3 on the γ‐Fe2 O3 crystallites and more FeCl3 ·6H2 O adsorbed on γ‐Fe2 O3 . Under the experimental conditions, the increase in γ‐Fe2 O3 content was larger than that of FeCl3 ·6H2 O, at ≤0.7 M NaOH. At >0.7 M NaOH, the increase in γ‐Fe2 O3 content was less than that of FeCl3 ·6H2 O. The non‐monotonic variation of the FeCl3 ·6H2 O/γ‐Fe2 O3 ratio was consistent with this result, and was consistent with the variation in apparent specific magnetisation with increasing NaOH concentration.