Advanced search
Start date
Betweenand
Related content
(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: 13/01284-2 - Theranostic nanoparticles based in superparamagnetic iron oxide for skin cancer therapy by magnetic hyperthermia
Grantee:Laudemir Carlos Varanda
Support type: Regular Research Grants
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 type: Scholarships in Brazil - Master
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 type: Research Grants - Young Investigators Grants
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 type: Scholarships in Brazil - Doctorate