Open AccessChanges in Fe 2+ /Fe 3+ molar ratio for the formation of spinel CoFe 2 O 4 layered double hydroxide nanoparticles
Author(s) -
Hamad Hesham,
Ibrahim Amal,
Abd Ellatif Mona
Publication year - 2019
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2018.5611
Subject(s) - calcination , magnetization , materials science , spinel , nanoparticle , hydroxide , analytical chemistry (journal) , crystal (programming language) , paramagnetism , crystal structure , transmission electron microscopy , nuclear chemistry , crystallography , inorganic chemistry , nanotechnology , chemistry , catalysis , magnetic field , condensed matter physics , physics , metallurgy , organic chemistry , quantum mechanics , computer science , programming language
A facile, fast, and cheap method has been proved for large‐scale synthesis of super‐paramagnetic CoFe 2 O 4 nanoparticles (CNPs) by the co‐precipitation process without surfactant and followed by calcination. In order to fabricate layered double hydroxide nanoparticles, the molar ratio Fe 2+ /Fe 3+ should be changed and confirmed by transmission electron microscopy. Also, all synthesised CNP samples were characterised by X‐ray diffraction and vibrating sample magnetometer to investigate the relationship between the crystal size and the saturation magnetisation. The good correlation between the influence of Fe 2+ /Fe 3+ ratio change and the initial pH showed that the slower formation of CNPs was obtained at higher concentration of NaOH and Fe 3+ . Also, the critical role for the crystal size, morphology, magnetisation characters, and cation distribution in the spinel structure was described well. Furthermore, the maximum saturation magnetisation and crystal size were obtained at the percentage Fe 2+ /Fe 3+ (1:1). The results stated that the synthesised CNPs had the potential to become a promising material in large scale.