32. MORPHOLOGICAL CHARACTERISTICS AND INTERFACES OF GOLD/COBALT JANUS NANOPARTICLES

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Agile - CaliBaja Center for Resilient Materials & Systems
Faculty Advisor(s): Olivia A. Graeve

Primary Student
Name: Kyungah Seo
Email: k1seo@ucsd.edu
Phone: 858-242-9446
Grad Year: 2018

Abstract
Janus particles are well known to have unique physical/chemical properties and directionality within a single particle because of their asymmetry. It has been found that the connection between magnetic nanoparticles to noble materials (Au, Pt) results in a red shift of the surface plasmon of the noble metal and an increas in magnetization of the magnetic component. However, the mechanism for the changes is still not fully explained. In this study, plasmonic/magnetic (Au/Co) bimetallic Janus nanoparticles were prepared to determine the effect of surface stability and atomic diffusion on the interface between Au and Co. Two different synthesis methods were adopted for preparation of the nanoparticles. First, Co nanoparticles were grown over the pre-synthesized Au seeds by thermal decomposition of Co(acac)2 and Co2(CO)8. The particles were prepared in several solutions (1-octadecene, diphenyl ether, benzyl ether) of varying polarity and using various amounts of surfactant/reducing agents to study the effect of the Co growth on Au. In the second method, the nanoparticles were formed by reducing HAuCl4 to Au in the presence of Co nanoparticle seeds in organic solution at 70C. Transmission electron microscopy, dynamic light scattering and X-ray diffraction were used to characterize the sizes, shapes, and morphologies of the synthesized particles.

Industry Application Area(s)
Electronics/Photonics | Materials

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