Hybrid magnetic-plasmonic nanocomposite : Embedding cobalt clusters in gold nanorods

• 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.

Subject headings

NATURVETENSKAP  -- Kemi -- Annan kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)

Keyword

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

Publication and Content Type

ref (subject category)

art (subject category)