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Conference Paper: Morphology-controlled growth of magnetic iron oxide components on gold nanoparticles as bi-functional agents

TitleMorphology-controlled growth of magnetic iron oxide components on gold nanoparticles as bi-functional agents
Authors
Issue Date2015
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7128764
Citation
The 2015 IEEE International Magnetics Conference (INTERMAG 2015), Beijing, China, 11-15 May 2015. In Conference Proceedings, 2015, paper no. GW-13 How to Cite?
AbstractSummary form only given. Hybrid nanostructure can inherit the physiochemical properties of its individual components to realize its multi-functionality. The coupling of plasmonic effect of gold nanoparticles with magnetic properties of iron oxide nanoparticles has shown great promise as bi-functional agents allowing simultaneous magnetic resonance imaging (MRI)/computed tomography (CT) imaging and magnetic/photonic thermal therapy. However, since gold and iron oxide are two dissimilar materials, the precise morphology and structure control for the hybrid nanostructure remains a great challenge, and there are few published studies on the correlation between composites morphologies and the optical/magnetic properties. In this work, we aim to fabricate gold/iron oxide hybrid nano-structures using less toxic precursors, control the morphology growth of iron oxide component on gold nanoparticles surface, and study the effects on optical and magnetic properties of final products. Here, nearly monodisperse gold/iron oxide hybrid nanoparticles were fabricated through thermal decomposition method. Spherical gold nanoparticles were pre-synthesized and used as seeds for the reduction of iron precursor to produce hybrid nanostructures. Various morphologies of iron oxide grown on the gold nanospheres surfaces were realized, including nano-shell, nano-octahedron, nano-flower, and dumbbell-shaped end. Pure gold nanospheres and iron oxide nanospheres were synthesized for comparison. The morphology and structure of obtained products were characterized by using TEM, EDX, electron diffraction pattern, and SEM. Their optical and magnetic properties were studied using UV-Vis spectroscopy and VSM. The plasmonic property of gold nanoparticles was shown to be affected by the optical index of its environment, and its absorbance peak was right-shifted after iron oxide shell coating. The gold/iron oxide dumbbell-shaped nanostructures displayed typical superparamagnetic behavior with no coerc- vity while the coercivity of gold/iron oxide nano-octahedron was about 45 Oe. The morphology-related blocking temperatures of the gold/iron oxide nano-structured samples were also studied through their ZFC/FC curves.
Persistent Identifierhttp://hdl.handle.net/10722/216412
ISBN

 

DC FieldValueLanguage
dc.contributor.authorLi, L-
dc.contributor.authorLeung, CW-
dc.contributor.authorRuotolo, A-
dc.contributor.authorJiang, C-
dc.contributor.authorPong, PWT-
dc.date.accessioned2015-09-18T05:26:51Z-
dc.date.available2015-09-18T05:26:51Z-
dc.date.issued2015-
dc.identifier.citationThe 2015 IEEE International Magnetics Conference (INTERMAG 2015), Beijing, China, 11-15 May 2015. In Conference Proceedings, 2015, paper no. GW-13-
dc.identifier.isbn978-1-4799-7321-7-
dc.identifier.urihttp://hdl.handle.net/10722/216412-
dc.description.abstractSummary form only given. Hybrid nanostructure can inherit the physiochemical properties of its individual components to realize its multi-functionality. The coupling of plasmonic effect of gold nanoparticles with magnetic properties of iron oxide nanoparticles has shown great promise as bi-functional agents allowing simultaneous magnetic resonance imaging (MRI)/computed tomography (CT) imaging and magnetic/photonic thermal therapy. However, since gold and iron oxide are two dissimilar materials, the precise morphology and structure control for the hybrid nanostructure remains a great challenge, and there are few published studies on the correlation between composites morphologies and the optical/magnetic properties. In this work, we aim to fabricate gold/iron oxide hybrid nano-structures using less toxic precursors, control the morphology growth of iron oxide component on gold nanoparticles surface, and study the effects on optical and magnetic properties of final products. Here, nearly monodisperse gold/iron oxide hybrid nanoparticles were fabricated through thermal decomposition method. Spherical gold nanoparticles were pre-synthesized and used as seeds for the reduction of iron precursor to produce hybrid nanostructures. Various morphologies of iron oxide grown on the gold nanospheres surfaces were realized, including nano-shell, nano-octahedron, nano-flower, and dumbbell-shaped end. Pure gold nanospheres and iron oxide nanospheres were synthesized for comparison. The morphology and structure of obtained products were characterized by using TEM, EDX, electron diffraction pattern, and SEM. Their optical and magnetic properties were studied using UV-Vis spectroscopy and VSM. The plasmonic property of gold nanoparticles was shown to be affected by the optical index of its environment, and its absorbance peak was right-shifted after iron oxide shell coating. The gold/iron oxide dumbbell-shaped nanostructures displayed typical superparamagnetic behavior with no coerc- vity while the coercivity of gold/iron oxide nano-octahedron was about 45 Oe. The morphology-related blocking temperatures of the gold/iron oxide nano-structured samples were also studied through their ZFC/FC curves.-
dc.languageeng-
dc.publisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7128764-
dc.relation.ispartofIEEE International Magnetics Conference (INTERMAG)-
dc.rightsIEEE International Magnetics Conference (INTERMAG). Copyright © IEEE.-
dc.rights©2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleMorphology-controlled growth of magnetic iron oxide components on gold nanoparticles as bi-functional agents-
dc.typeConference_Paper-
dc.identifier.emailPong, PWT: ppong@hkucc.hku.hk-
dc.identifier.authorityPong, PWT=rp00217-
dc.description.naturepostprint-
dc.identifier.doi10.1109/INTMAG.2015.7157588-
dc.identifier.hkuros253441-
dc.publisher.placeUnited States-
dc.customcontrol.immutablesml 151119-

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