Tuning the magnetic properties of iron oxide nanoparticles by a room-temperature air-atmosphere (RTAA) co-precipitation method

S. Vikram, M. Dhakshnamoorthy, R. Vasanthakumari, A. R. Rajamani, Murali Rangarajan*, Takuya Tsuzuki

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)

    Abstract

    The ability of a room-temperature air-atmosphere (RTAA) co-precipitation method to tune the magnetic properties of iron oxide nanoparticles was investigated. It was demonstrated that superparamagnetic nanoparticles with different particle sizes ranging from 7 to 25 nm and magnetic properties with saturation magnetization between 2 to 75 emu g-1 can be synthesized by simply controlling the molar ratio of ferrous to ferric ions and the concentration of ammonium solution, without heat treatment or oxygen-level control. It was revealed that the tuning of the magnetic properties was associated with the compositional control between magnetite and maghemite. Ammonium concentration was also an important factor to obtain dispersed superparamagnetic (SPM) or ferrimagnetic (FM) nanoparticles.

    Original languageEnglish
    Pages (from-to)3870-3878
    Number of pages9
    JournalJournal of Nanoscience and Nanotechnology
    Volume15
    Issue number5
    DOIs
    Publication statusPublished - 1 May 2015

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