Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 498, Issue -, Pages 282-291Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.03.073
Keywords
Fe3O4 microfibers; Hydrothermal synthesis; Sodium citrate; Growth mechanism; Electrochemistry
Categories
Funding
- National Natural Science Foundation of China [51204119]
- Shanxi Province Science Foundation for Youths [2014021015-4, 2015021107]
- Shanxi Science and Technology Development Plan [201603D321011]
- China Scholarship Council
- Fundamental Research Fund for the Central Universities [GK201302013]
- Innovation Funds of Graduate Programs, SNNU [2015CXS040]
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One dimensional Fe3O4 sub-microfibers with an average diameter of about 920 nm and length of about 25 mu m were prepared by hydrothermal synthesis in the presence of sodium citrate (Na(3)cit). The physicochemical properties were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). It was found that Fe3O4 crystal nuclei were generated from different Fe2+ citrate complexes under hydrothermal conditions and Na(3)cit as a capping agent promoted the formation of Fe3O4 microfibers. The Fe3O4 nanocrystals grew along the (1 1 0) axis on the exposed (1 1 1) facet, and then further formed microfibers via an oriented attachment mechanism during the collisions. Polyvinylpyrrolidine (PVP) was more conducive to microfibers growth in comparison to polyethyleneglycol 4000 (PEG-4000), cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SOS). The electrochemical measurements show that the Fe3O4 sub-microfibers had a specific capacitance of 117.6 F g(-1) with good cycling performance. (C) 2017 Published by Elsevier Inc.
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