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Synthesis and magnetic characterization of organically-capped gold nanoparticles
thesis
posted on 2017-01-23, 22:59 authored by Zhang, HaoGold nanoparticles (Au NPs) have been widely studied because of their novel optical, electrochemical, catalytic, biocompatible and excellent shelf store properties which play important roles in applications. The ferromagnetism, which may widen the potential applications in spintronics, magnetic and magneto-electronic devices, has been discovered in organically-protected Au NPs. Particle size and ligand capping effects are important in the induction of ferromagnetism. However, it is difficult to control these parameters independently by the traditional Brust method. Hence, a new two-step process has been developed to synthesize ferromagnetic Au NPs in this project to clarify the effects separately as complement of the traditional Brust method. To reveal the mechanism of ferromagnetic thiolate-capped Au NPs, various experimental methods and the density functional theory (DFT) calculations are applied. Furthermore, the fine surface morphology of Au adatom is experimentally observed and simulated by DFT calculations. They reveal the contribution of adatom in ferromagnetism and the details of electronic structure. In addition, the electronic transport properties, which are important in potential applications, are investigated after replacing thiol molecules by polythiolphene which is a well-known conductive polymer.
History
Campus location
AustraliaPrincipal supervisor
Kiyonori SuzukiYear of Award
2014Department, School or Centre
Materials Science and EngineeringAdditional Institution or Organisation
Materials EngineeringCourse
Doctor of PhilosophyDegree Type
DOCTORATEFaculty
Faculty of EngineeringUsage metrics
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