Ferromagnetism of polythiophene-capped Au nanoparticles

Kiyonori Suzuki, Hao Zhang, Kei Saito, Jose Javier Saiz Garitaonandia, Eider Goikolea, M Insausti

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5 Citations (Scopus)

Abstract

The magnetic and electrical transport properties of regioregular poly(3-hexylthiophene)-capped Au nanoparticles (NPs) doped with iodine have been investigated to clarify the effectiveness of conductive polymer capping on the induction of ferromagnetism in Au. The room-temperature magnetization curve of the undoped polythiophene-capped Au NPs exhibits a clear hysteresis behavior with a coercive force of 160 Oe. The spontaneous magnetization normalized by the mass of Au is 2.0 × 10−2 emu/g. The spontaneous magnetization was found virtually unaffected by iodine doping, whereas the electrical conductivity is enhanced dramatically to ∼10 S/cm. Our results show that polythiophene capping could lead to spontaneous magnetic polarization in Au NPs, and the conductivity of the polymer capping does not affect the ferromagnetism of the Au nanoparticles, opening a possibility for further investigation into the magnetotransport behavior of ferromagnetic Au NPs
Original languageEnglish
Article number07E328
Number of pages3
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
Publication statusPublished - 2011

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