Coupling agent effect on magnetic properties of functionalized magnetite-based nanoparticles

被引：288

作者：

Daou, T. J. ^{[1
]}

Greneche, J. M. ^{[2
]}

Pourroy, G. ^{[1
]}

Buathong, S. ^{[1
]}

Derory, A. ^{[1
]}

Ulhaq-Bouillet, C. ^{[1
]}

Donnio, B. ^{[1
]}

Guillon, D. ^{[1
]}

Begin-Colin, S. ^{[1
]}

机构：

[1] ULP, CNRS, UMR 7504, Inst Phys & Chim Mat, F-67034 Strasbourg 2, France

[2] Univ Maine, UMR CNRS 6087, Lab Phys Etat Condense, F-72085 La Mans 9, France

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 18期

关键词：

D O I：

10.1021/cm801405n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of surface inorganic-organic interactions on magnetic and structural properties of iron oxide magnetic nanoparticles functionalized by lipophilic stilbene molecules has been investigated. The molecules have been grafted through either phosphonate or carboxylate coupling agents. Mossbauer spectra recorded at 300 and 77K suggest a global composition of Fe2.82O4 for the two types of functionalization. Complementary in-field Mossbauer and SQUID measurements have demonstrated that the nanoparticles consist in a magnetite core surrounded by an oxidized layer. The oxidized shell exhibits a spin canting in the carboxylate case leading to a decrease of the net magnetization of the oxide nanoparticle. No canting occurs in the phosphonate case, and the magnetic properties are therefore preserved. The magnetic properties thus depend on the coupling agent, e.g., surface interactions. This result is of primary importance to tune the magnetic properties of functionalized nanoparticles for biomedical and high density storage media applications.

引用

页码：5869 / 5875

页数：7

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