Magnetization of amorphous FeOOH chrysanthemum-like nanosheets under ambient conditions

Yan Si; Siyu Shi; Jingyun Jing; Yun Bai; Qian Wang

doi:10.1039/d3cc00433c

Magnetization of amorphous FeOOH chrysanthemum-like nanosheets under ambient conditions

Chem Commun (Camb). 2023 May 9;59(38):5701-5704. doi: 10.1039/d3cc00433c.

Authors

Yan Si¹, Siyu Shi², Jingyun Jing³, Yun Bai⁴, Qian Wang¹

Affiliations

¹ Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. wangqian@iccas.ac.cn.
² Aerospace Science & Industry Defense Technology Research and Test Center, Beijing 100854, China.
³ Beijing Key Laboratory of Metro Fire and Passenger Transportation Safety, China Academy of Safety Science and Technology, Beijing 100012, China.
⁴ Institute of Analysis and Testing Beijing Academy of Science and Technology (Beijing Center for Physical and Chemical Analysis), Beijing 100094, China.

PMID: 37083729
DOI: 10.1039/d3cc00433c

Abstract

The conversion of paramagnetic solid iron oxides to magnetic iron oxides has drawn considerable interest, but it's still challenging to carry out without heat treatment or irradiation. In this work, solid amorphous iron oxide chrysanthemum-like nanosheets synthesized by a smart redox strategy at the interface of a soap-free emulsion are magnetized at room temperature and under ambient pressure. An amorphous FeOOH hollow shell with needles towards water is produced by the reaction of cumyl hydroperoxide (CHPO) and iron(II) sulfate (FeSO₄) at the interface of the emulsion generated by ultrasound and torn up into chrysanthemum-like nanosheets simultaneously. With the presence of noble metal ions, such as Au³⁺, the magnetization of the nanosheets was carried out as soon as sodium borohydride (NaBH₄) was introduced into the dispersion. The magnetic chrysanthemum-like nanosheets present saturation magnetization (Ms) of 32 emu g^-1 and can be placed linearly in a magnetic field.