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Uniform rhombohedral α-Fe_2O_3 nanoparticles,~60nm 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(104) planes.The concentration of triphenylphosphine played an important role in morphological evolution of the α-Fe_2O_3 nanoparticles.The as-prepared rhombohedral nanoparticles possessed remanent magnetization M_r of 2.6×10~(-3) emu/g and coercivity H_C of 2.05 Oe,both lower than those of other α-Fe_2O_3 particles with similar size,indicating their potential applications as superparamagnetic precursor materials.Furthermore,these rhombohedral α-Fe_2O_3 nanoparticles exhibited good sensor capability toward H_2O_2 with a linear response in the concentration range of 2-20 mM.
Uniform rhombohedral α-Fe_2O_3 nanoparticles, ~ 60 nm in size, were synthesized via a triphenylphosphine-assisted hydrothermal method. Scanning electron micrograph (SEM) and transmission electron micrograph (TEM) analyzes showed that the as-synthesized rhombohedral nanoparticles were enclosed by six (104 ) planes.The concentration of triphenylphosphine plays an important role in morphological evolution of the α-Fe_2O_3 nanoparticles.The as-prepared rhombohedral nanoparticles possessed remanent magnetization M_r of 2.6 × 10 ~ (-3) emu / g and coercivity H_C of 2.05 Oe, Both lower than those of other α-Fe_2O_3 particles with similar size, indicating their potential applications as superparamagnetic precursor materials. Ferrthermore, these rhombohedral α-Fe_2O_3 nanoparticles exhibiting good sensor capability toward H_2O_2 with a linear response in the concentration range of 2-20 mM .