Magnetic and electrochemical behavior of rhombohedral α-Fe2O3 nanoparticles with (1 0 4) dominant facets--颗粒学报PARTICUOLOGY

Liu, Z., Lv, B., Wu, D., Sun, Y., & Xu, Y. (2013). Magnetic and electrochemical behavior of rhombohedral α-Fe2O3 nanoparticles with (104) dominant facets. Particuology, 11(3), 327–333. https://doi.org/10.1016/j.partic.2012.06.016

Magnetic and electrochemical behavior of rhombohedral α-Fe₂O₃ nanoparticles with (1 0 4) dominant facets

Zhong Liu ^{a b}, Baoliang Lv ^a *, Dong Wu ^a, Yuhan Sun ^{a c}, Yao Xu ^a

a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
b Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
c Low Carbon Conversion Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China

10.1016/j.partic.2012.06.016

Volume 11, Issue 3, June 2013, Pages 327-333

Received 22 February 2012, Revised 21 May 2012, Accepted 12 June 2012, Available online 11 February 2013.

E-mail: lbl604@sxicc.ac.cn

Highlights

► Rhombohedral α-Fe₂O₃ nanoparticles with a narrow size distribution (60 nm) were synthesized.

► Uniform rhombohedral α-Fe₂O₃ nanoparticles were enclosed by six equivalent (1 0 4) planes.

► Rhombohedral α-Fe₂O₃ nanoparticles showed low remanent magnetization and coercivity.

► Rhombohedral α-Fe₂O₃ nanoparticles exhibited good sensor capability toward H₂O₂.

Abstract

Uniform rhombohedral α-Fe₂O₃ nanoparticles, ∼60 nm in size, were synthesized via a triphenylphosphine-assisted hydrothermal method. Scanning electron micrograph (SEM) and transmission electron micrograph (TEM) analyses showed that the as-synthesized rhombohedral nanoparticles were enclosed by six (1 0 4) planes. The concentration of triphenylphosphine played an important role in morphological evolution of the α-Fe₂O₃ nanoparticles. The as-prepared rhombohedral nanoparticles possessed remanent magnetization M_rof 2.6 × 10⁻³ emu/g and coercivity H_C of 2.05 Oe, both lower than those of other α-Fe₂O₃ particles with similar size, indicating their potential applications as superparamagnetic precursor materials. Furthermore, these rhombohedral α-Fe₂O₃ nanoparticles exhibited good sensor capability toward H₂O₂ with a linear response in the concentration range of 2–20 mM.

Graphical abstract

Keywords

α-Fe₂O₃; Morphology; Magnetic materials; Chemical synthesis

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