Tailored design of CoxMn1-xFe2O4 nanoferrites: a new route for dual control of size and magnetic properties

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Carlos Fernandes (Author) Other; Clara Pereira (Author) FCUP; Maria Paz Fernandez Garcia (Author) Other; Andre M Pereira (Author) FCUP; Alexandra Guedes (Author) FCUP; Rodrigo Fernandez Pacheco (Author) Other; Alfonso Ibarra (Author) Other; Ricardo Ibarra, MR (Author) Other; Joao P Araujo (Author) FCUP; Cristina Freire (Author) FCUP

Journal

Title: Journal of Materials Chemistry C

Vol. 2

Pages: 5818-5828

ISSN: 2050-7526

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 54 Citations

Scopus - 53 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-009-NAQ

DOI: 10.1039/c4tc00429a

Abstract (EN): This work reports the tailored design of novel mixed ferrite nanoparticles, CoxMn1-xFe2O4 (x = 0, 0.3, 0.7, and 1), through an optimized one-pot aqueous coprecipitation process. The influence of the substitution between Mn(II) and Co(II) and of the alkaline agent, isopropanolamine (MIPA) or NaOH, on the morphological, chemical and magnetic properties of the nanomaterials was investigated. The joint action between chemical substitution and type of alkaline agent allowed a precise tuning of the particle size, magnetic properties and inversion degree of the spinel structure. A wide range of particle dimensions (from 3 to 30 nm) and saturation magnetization (from 57 to 71 emu g(-1)) was achieved. The increase of Co(II) content from x = 0 to x = 1 led to a systematic decrease of the particle size, regardless of the base type, which could be modelled by an exponential decay function. For each Co : Mn composition, the use of MIPA instead of the traditional NaOH promoted a three times reduction of the particle size and simultaneously switched the magnetic state of the CoxMn1-xFe2O4 nanomaterials from ferromagnetic to superparamagnetic. These results constitute a step forward in the challenging quest for high-performance magnetic nanoprobes by an eco-friendly synthesis route.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11