Block Copolymer Directed One-Pot Simple Synthesis of L1(0)-Phase FePt Nanoparticles inside Ordered Mesoporous Aluminosilicate/Carbon Composites

Cited 49 time in webofscience Cited 0 time in scopus
  • Hit : 52
  • Download : 0
A "one-pot" synthetic method was developed to produce L1(0)-phase FePt nanopartides in ordered mesostructured aluminosilicate/carbon composites using polyisoprene-block-poly(ethylene oxide) (Pl-b-PEO) as a structure-directing agent. Pl-b-PEO block copolymers with aluminosilicate sols are self-assembled with a hydrophobic iron precursor (dimethylaminomethylferrocene) and a hydrophobic platinum precursor (dimethyl(1,5-cyclooctadiene)platinum(II)) to obtain mesostructured composites. The as-synthesized material was heat-treated to 800 degrees C under an Ar/H-2 mixture (5% v/v), resulting in the formation of fct FePt nanocrystals encapsulated in ordered mesopores. By changing the quantities of the Fe and Pt precursors in the composite materials, the average particle size of the resulting fct FePt, estimated using the Debye-Scherer equation with X-ray diffraction patterns, can be easily controlled to be 2.6-10.4 nm. Using this simple synthetic method, we can extend the size of directly synthesized fct FePt up to similar to 10 nm, which cannot be achieved directly in the colloidal synthetic method. All fct FePt nanoparticles show hysteresis behavior at room temperature, which indicates that ferromagnetic particles are obtained inside mesostructued channels. Well-isolated, similar to 10 nm fct FePt have a coercivity of 1100 Oe at 300 K. This coercivity value is higher than values of fct FePt nanoparticles synthesized through the tedious hard template method by employing SBA-15 as a host material. The coercivity value for FePt-1 (2.6 nm) at 5 K is as high as 11 900 Oe, which is one of the largest values reported for FePt nanoparticles, or any other magnetic nanoparticles. The fct FePt nanoparticles also showed exchange-bias behavior.
Publisher
AMER CHEMICAL SOC
Issue Date
2011-02
Language
English
Article Type
Article
Keywords

MAGNETIC-PROPERTIES; DIBLOCK COPOLYMER; SILICA STRUCTURES; EXCHANGE BIAS; NANOCRYSTALS; TRANSFORMATION; TEMPERATURE; TRANSITION; MICROPHASE; REDUCTION

Citation

ACS NANO, v.5, no.2, pp.1018 - 1025

ISSN
1936-0851
DOI
10.1021/nn102451y
URI
http://hdl.handle.net/10203/245101
Appears in Collection
CBE-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 49 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0