Synthesis of size-controlled hollow Fe3O4 nanospheres and their growth mechanism--颗粒学报PARTICUOLOGY

Shi, L., He, Y., Hu, Y., Wang, X., Jiang, B., & Huang, Y. (2020). Synthesis of size-controlled hollow Fe3O4 nanospheres and their growth mechanism. Particuology, 49, 16-23. https://doi.org/10.1016/j.partic.2019.02.005

Synthesis of size-controlled hollow Fe₃O₄ nanospheres and their growth mechanism

Lei Shi ^{a b}, Yurong He ^{a b *}, Yanwei Hu ^{a b}, Xinzhi Wang ^{a b}, Baocheng Jiang ^b, Yimin Huang ^b

a Heilongjiang Key Laboratory of New Energy Storage Materials and Processes, Harbin 150001, China
b School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

10.1016/j.partic.2019.02.005

Volume 49, April 2020, Pages 16-23

Received 3 January 2019, Revised 18 February 2019, Accepted 24 February 2019, Available online 23 July 2019, Version of Record 26 February 2020.

E-mail: rong@hit.edu.cn

Highlights

• Size-controlled Fe₃O₄ nanospheres were synthesized and characterized.

• Nanosphere size was investigated as a function of reaction time and reaction solution composition.

• Fe₃O₄ nanosphere formation mechanism was elucidated.

Abstract

Size-controlled hollow Fe₃O₄ nanospheres were synthesized via a one-pot hydrothermal method as a function of reaction time and sodium citrate, polyacrylamide, and urea content. Multiple characterization techniques such as scanning and transmission electron microscopy and Raman spectroscopy were employed to investigate the crystal structure and morphology of the obtained nanospheres. The Fe₃O₄ nanosphere formation mechanism was elucidated from analyzing the characterization data. High levels of sodium citrate and longer reaction times were observed to increase the diameter of the nanospheres until hollow structures formed. Furthermore, polyacrylamide and urea promoted the formation of hollow structures. The hollow-structured Fe₃O₄ nanospheres exhibited high magnetization saturation values in the range of 48.8–58.7 emu/g. The facile synthesis method described herein, to generate size-controlled Fe₃O₄ nanospheres with tailored properties, demonstrates potential across a wide range of fields from drug-delivery and stealth devices, to environmental and energy applications.

Graphical abstract

Keywords

Fe₃O₄ nanoparticles; Sphere size; Magnetic properties

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