Size Dependent Ferromagnetic-Like Behavior in Thiol Capped Gold Nanoparticles
Gold nanoparticles (NPs) capped with alkanethiols present a surprising ferromagnetic-like behavior despite the diamagnetic behavior of bulk gold. In this paper, the size dependence for the magnetism in these NPs is analyzed. Au NPs have been prepared by chemical routes. The average particle size ranges from 2 to 15 nm, as X-ray diffraction, Transmission Electron Microscopy and Atomic Force Microscopy point out. The Surface Plasmon Resonance band suggests the existence of a surface layer where electrons are strongly immobilized. Magnetic characterization, carried out with a Superconducting Quantum Interference Device (SQUID) magnetometer, shows that the ferromagnetic-like character of the NPs is progressively lost upon increasing particle size. The experimental results reveal that this surprising magnetism is highly dependent on the particle size and arises from the outer shell of the NPs (where gold atoms bonded to the alkanethiols chains), whereas the core preserves the bulk characteristics of gold.
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Document Type: Research Article
Publication date: December 1, 2009
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