New synthesis of ferrite-silica nanocomposites by a sol-gel auto-combustion

被引：53

作者：

Cannas, C ^{[1
]}

Musinu, A ^{[1
]}

Peddis, D ^{[1
]}

Piccaluga, G ^{[1
]}

机构：

[1] Cittadella Univ Monserrato, Dipartimento Sci Chim, I-09042 Cagliari, Italy

来源：

JOURNAL OF NANOPARTICLE RESEARCH | 2004年 / 6卷 / 2-3期

关键词：

autocombustion; sol-gel; ferrite; nanocomposite; nanoparticle; synthesis;

D O I：

10.1023/B:NANO.0000034679.22546.d7

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A sol-gel autocombustion method was used to synthesize nanometric metal-oxide powders, and was extended for the first time to prepare ferrite-silica nanocomposites. The gels obtained by mixing suitable amounts of citric acid, metal nitrates, ammonia (pure phases) and tetraethylortosilicate (nanocomposites) were converted directly to ferrite (either gamma-Fe2O3 or CoFe2O4) or ferrite-silica composites through a rapid autocombustion reaction. The combustion involves a thermally induced autocatalytic oxidation-reduction reaction between the nitrate and the citrate ions. The sample characterization by X-ray diffraction, transmission electron microscopy and N-2 physisorption measurements revealed nanosized pure phase powders and nanocomposites in which small spherical nanoparticles (mean size 3.5 and 5.0 nm, respectively for the gamma-Fe2O3 and CoFe2O4) are homogeneously dispersed over a mesoporous silica matrix.

引用

页码：223 / 232

页数：10

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