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Title: Platinum dendritic nanoparticles with magnetic behavior

Magnetic nanoparticles have attracted increasing attention for biomedical applications in magnetic resonance imaging, high frequency magnetic field hyperthermia therapies, and magnetic-field-gradient-targeted drug delivery. In this study, three-dimensional (3D) platinum nanostructures with large surface area that features magnetic behavior have been demonstrated. The well-developed 3D nanodendrites consist of plentiful interconnected nano-arms ∼4 nm in size. The magnetic behavior of the 3D dendritic Pt nanoparticles is contributed by the localization of surface electrons due to strongly bonded oxygen/Pluronic F127 and the local magnetic moment induced by oxygen vacancies on the neighboring Pt and O atoms. The magnetization of the nanoparticles exhibits a mixed paramagnetic and ferromagnetic state, originating from the core and surface, respectively. The 3D nanodendrite structure is suitable for surface modification and high amounts of drug loading if the transition temperature was enhanced to room temperature properly.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3]
  1. Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2522 (Australia)
  2. (Australia)
  3. Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of the Ministry of Education, School of Chemistry and the Environment, Beihang University, Beijing 100191 (China)
Publication Date:
OSTI Identifier:
22308482
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; DENDRITES; MAGNETIC FIELDS; MAGNETIC MOMENTS; MAGNETIZATION; MODIFICATIONS; NANOPARTICLES; NANOSTRUCTURES; NMR IMAGING; OXYGEN; PARAMAGNETISM; PLATINUM; SURFACE AREA; SURFACES; TEMPERATURE RANGE 0273-0400 K; TRANSITION TEMPERATURE; VACANCIES