Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/105580
Type: Artigo de periódico
Title: Chemical Synthesis And Structural Characterization Of Highly Disordered Ni Colloidal Nanoparticles
Author: Winnischofer H.
Rocha T.C.R.
Nunes W.C.
Socolovsky L.M.
Knobel M.
Zanchet D.
Abstract: This work focuses on synthetic methods to produce monodisperse Ni colloidal nanoparticles (NPs), in the 4-16 nm size range, and their structural characterization. Narrow size distribution nanoparticles were obtained by high-temperature reduction of a nickel salt and the production of tunable sizes of the Ni NPs was improved compared to other methods previously described. The as-synthesized nanoparticles exhibited spherical shape and highly disordered structure, as it could be assigned by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). Annealing at high temperature in organic solvent resulted in an increase of nanoparticle atomic ordering; in this case, the XRD pattern showed an fcc-like structure. Complementary data obtained by X-ray absorption spectroscopy confirmed the complex structure of these nanoparticles. Temperature dependence of the magnetic susceptibility of these highly disordered Ni NPs showed the magnetic behavior cannot be described by the conventional superparamagnetic theory, claiming the importance of the internal structure in the magnetic behavior of such nanomaterials. © 2008 American Chemical Society.
Editor: 
Rights: fechado
Identifier DOI: 10.1021/nn700152w
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-47649105677&partnerID=40&md5=3b683a19f3ef9ac7d146e5497a168734
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
2-s2.0-47649105677.pdf834.71 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.