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Hybrid magnetic-plasmonic nanocomposite: Embedding cobalt clusters in gold nanorods
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2015 (English)In: RSC Advances, ISSN 2046-2069, Vol. 5, no 44, 34696-34703 p.Article in journal (Refereed) Published
Abstract [en]

We developed a method to fabricate hybrid magnetic-plasmonic nanorods (Au-Co NRs) via a modified seed mediated method. The only modification is to use cobalt ions instead of Au3+ in the preparation of the seed solution to obtain gold nanorods doped with Co clusters. By adjusting the amount of cobalt seed solution, Au-Co NRs of controlled aspect ratio can be obtained. The optical properties of the obtained Au-Co NRs were investigated and compared to those of the pure Au NRs. A slight shift and broadening were observed in the alloys compared to the pure ones, which was attributed to the presence of Co clusters leading to suppression of the dielectric properties. High resolution transmission electron microscopy (HRTEM) images indicate the existence of Co clusters in situ in the Au NR host and clearly show the metal-metal interface. The magnetic properties of the obtained Au-Co NRs increase as the concentration of dopant Co cluster seeds increases, as investigated by vibrating sample magnetometry (VSM). Our approach allows us to design nanomaterials of controlled shape, optical and magnetic properties which have many promising applications in tharanostics and photoelectronics.

Place, publisher, year, edition, pages
2015. Vol. 5, no 44, 34696-34703 p.
Keyword [en]
Aspect ratio, Cobalt compounds, Dielectric properties, Doping (additives), Gold, Gold compounds, High resolution transmission electron microscopy, Magnetic properties, Magnetism, Nanorods, Optical properties, Plasmons, Cobalt clusters, Controlled shape, Gold nanorod, Metal-metal interfaces, Photoelectronics, Seed solution, Seed-mediated methods, Vibrating sample magnetometry
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URN: urn:nbn:se:kth:diva-166944DOI: 10.1039/c5ra01918dISI: 000353168300023ScopusID: 2-s2.0-84928329071OAI: diva2:815166
Sida - Swedish International Development Cooperation Agency, 348-2007-6992

QC 20150529

Available from: 2015-05-29 Created: 2015-05-21 Last updated: 2015-08-05Bibliographically approved

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Rao, K. Venkat
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