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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Magneto-plasmonic Au-Coated Co nanoparticles synthesized via hot-injection method

Full text
Author(s):
Souza, Jr., Joao B. [1] ; Varanda, Laudemir C. [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, Colloidal Mat Grp, CP 780, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Nanotechnology; v. 29, n. 6 FEB 9 2018.
Web of Science Citations: 4
Abstract

A synthetic procedure is described for the obtaining of superparamagnetic Co nanoparticles (NPs) via hot-injection method in the presence of sodium borohydride. The Co NPs obtained have an average diameter of 5.3 nm and saturation magnetization of 115 emu g(-1). A modified Langevin equation is fitted to the magnetization curves using a log-normal distribution for the particle diameter and an effective field to account for dipolar interactions. The calculated magnetic diameter of the Co NPs is 0.6 nm smaller than TEM-derived values, implying a magnetic dead layer of 0.3 nm. The magnetic core is coated with Au to prevent oxidation, resulting in water-stable magneto-plasmonic Co/Au core/shell NPs with saturation of 71.6 emu g(-1). The coating adds a localized surface plasmon resonance property with absorbance in the so-called `therapeutic window' (690-900 nm), suitable for biomedical applications. It is suggested that these multifunctional NPs are distinguished as a potential platform for applied and fundamental research. (AU)

FAPESP's process: 10/04208-7 - Magnetic nanoparticles of gold-coated cobalt and cobalt ferrite as biocompatible materials for biomedical applications
Grantee:João Batista Souza Junior
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 12/02093-3 - Synthesis of Co@Au (superparamagnetics) and CdSe@Zn (quantum dots) core@shell nanostructures for applications as antineoplasia agents
Grantee:João Batista Souza Junior
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 13/01284-2 - Theranostic nanoparticles based in superparamagnetic iron oxide for skin cancer therapy by magnetic hyperthermia
Grantee:Laudemir Carlos Varanda
Support Opportunities: Regular Research Grants
FAPESP's process: 07/07919-9 - Colloidal magnetic nanocrystals: synthesis of self-assembled and macromolecules-functionalised nanospheres, nanowires, and nanorods for advanced magnetic recording, biotechnological, and biomedical applications
Grantee:Laudemir Carlos Varanda
Support Opportunities: Research Grants - Young Investigators Grants