Controllable Synthesis of Single‐Crystalline Fe₃O₄ Nanorice by a One‐Pot, Surfactant‐Assisted Hydrothermal Method and Its Properties

Abstract

Single‐crystalline Fe3O4 nanorice has been prepared by a simple one‐pot, surfactant‐assisted hydrothermal method using dodecyltrimethylammonium bromide (DTAB) as a surfactant. X‐ray powder diffraction, field emission scanning electron microscopy (FESEM), TEM, high‐resolution (HR)TEM, micro‐Raman spectroscopy and magnetic measurements have been employed to study the properties of the product. The importance of NaAc and ethylene glycol in the formation of the pure magnetite phase has been established. The as‐synthesized products have a regular rice‐like shape with an average diameter of 150 nm and length of 500 nm and are monodisperse. Shape evolution from cauliflower‐ to rice‐like morphology has been achieved by controlling the DTAB concentration. A possible formation mechanism for the Fe3O4 nanorice is explored. Furthermore, the product showed ferromagnetic properties at room temperature.

Synthesis of V2O5 hierarchical structures for long cycle-life lithium-ion storage

“…3c), the carved sheets detach from the aggregates and begin to form irregular hierarchical structures. [41][42][43][44] In summary, the conceivable growth process can be described as a fast nucleation of primary particles followed by aggregation and crystallization of primary particles. 3d.…”

A physical approach for the estimation of the SERS enhancement factor through the enrichment and separation of target molecules using magnetic adsorbents

“…EG is a widely used chemical for the preparation of Fe 3 O 4 NPs by virtue of its reducibility at high temperatures. [56][57][58] The H 2 O molecule also has a strong oxidization at high temperature. 59 Under hydrothermal conditions, all precursors and solvents endured high temperature and high pressure in an autoclave with a conned space.…”

Improvements in the Organic-Phase Hydrothermal Synthesis of Monodisperse MxFe3–xO4 (M = Fe, Mg, Zn) Spinel Nanoferrites for Magnetic Fluid Hyperthermia Application

“… 14 Typically, the decomposition of iron precursors in an aqueous solution with or without surfactants results in aggregated clusters of larger size distribution. For example, a polyethylene glycol (PEG)–Fe 3 O 4 nanodisc, 15 ethylene glycol (EG)–Fe 3 O 4 nanoflowers, 10 dodecyltrimethylammonium bromide–Fe 3 O 4 NPs, 16 Fe 3 O 4 /C core–shell nanorings with EG/PEG, 17 and PEG–Mn 0.2 Ni 0.8 Fe 2 O 4 18 have all been synthesized utilizing this method. In contrast to the hydrolytic synthesis of nanoferrites, only a limited number of reports have highlighted the organic-phase hydrothermal synthesis of nanocrystals.…”