Jump to main content
Jump to site search

Issue 35, 2013
Previous Article Next Article

Nanomagnetism study of highly-ordered iron oxide nanocrystal assemblies fabricated by the Langmuir–Blodgett technique

Author affiliations

Abstract

Iron oxide nanocrystals are ideal building blocks for the construction of flexible nanodevices whose performance can be modulated by controlling the morphology of isolated particles and their organizational form. This work demonstrates the fabrication of high quality Langmuir–Blodgett (LB) nanocrystal assemblies with limited overlapping and higher coverage by systemically and combinatorially optimizing the parameters of compression pressure and quantity of spread nanocrystals. Monodispersed iron oxide nanocrystals with a diameter of 11.8 nm were synthesized by thermal decomposition of Fe(CO)5 in trioctylamine with the presence of oleic acid. Multilayer nanocrystal assemblies were obtained through a layer-by-layer (LBL) process by repeating the transfer procedure after their hydrophilicity had been improved via treatment in a UV–ozone oven. The quality of nanocrystal assemblies was investigated by UV-vis spectrometry and scanning electron microscopy. The nanomagnetism for the nanostructures of different combination manners was studied systemically by a superconducting quantum interference device (SQUID). A lower superparamagnetic blocking temperature was found in the monolayer Fe3O4 nanocrystal assembly. The superparamagnetic blocking temperature in magnetic nanocrystal assemblies could be tuned through modifying the interparticle interactions among the interlayer and intralayers by controlling the layer number of the assemblies.

Graphical abstract: Nanomagnetism study of highly-ordered iron oxide nanocrystal assemblies fabricated by the Langmuir–Blodgett technique

Back to tab navigation

Article information


Submitted
16 May 2013
Accepted
02 Jul 2013
First published
30 Jul 2013

Phys. Chem. Chem. Phys., 2013,15, 14689-14695
Article type
Paper

Nanomagnetism study of highly-ordered iron oxide nanocrystal assemblies fabricated by the Langmuir–Blodgett technique

H. Zhang, N. Bao, D. Yuan and J. Ding, Phys. Chem. Chem. Phys., 2013, 15, 14689
DOI: 10.1039/C3CP52060A

Social activity

Search articles by author

Spotlight

Advertisements