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Synthesis of Fe3O4/ZnO Core-shell Nanoparticles for Photodynamic Therapy Applications

Published online by Cambridge University Press:  01 February 2011

Juan C. Beltran Huarac
Affiliation:
juan.beltran1@upr.edu, University of Puerto Rico, Mayaguez, Physics, Mayaguez, Puerto Rico
Surinder P. Singh
Affiliation:
surinder.singh@uprm.edu, University of Puerto Rico, Mayaguez, Engineering Science & Materials, Mayaguez, Puerto Rico
Maharaj S. Tomar
Affiliation:
maharaj.tomar@upr.edu, University of Puerto Rico, Mayaguez, Physics, Mayaguez, Puerto Rico
Sandra Peňa
Affiliation:
sandraluengas@yahoo.es, University of Puerto Rico, Mayaguez, Chemistry, Mayaguez, Puerto Rico
Luis Rivera
Affiliation:
luis.upr@gmail.com, University of Puerto Rico, Mayaguez, Chemistry, Mayaguez, Puerto Rico
Oscar Perales-Perez
Affiliation:
operalesperez@yahoo.com, University of Puerto Rico, Mayaguez, Engineering Science & Materials, Mayaguez, Puerto Rico
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Abstract

The use of nanoparticles as carriers of photosensitizer (PS) molecules for photodynamic therapy (PDT) has attracted much interest on core-shell nanosize structures. Herein, we used a simple aqueous solution method to synthesize Fe3O4/ZnO core-shell nanoparticles. X-ray diffraction (XRD) analyses showed the presence of well defined peaks corresponding to Fe3O4 and ZnO in as-synthesized nanocrystals. Vibrating sample magnetometer (VSM) measurements showed that these nanoparticles exhibited superparamagnetic behavior of the core with no coercivity nor remanence. X-ray photoelectron spectroscopy (XPS) analyses revealed the presence of Zn1/2 and Zn3/2 species on the surface of nanocrystals. Photoluminescence measurements showed excitonic emission of ZnO co-existing with a weak and broad defect- related green emission at room temperature. The generation of singlet oxygen was monitored via the photooxidation of diphenyl-1,3-isobenzofuran (DPBF) with different light sources, followed by absorption spectroscopy at 409 nm. The capability of synthesized nanoparticles to generate singlet oxygen has also been verified.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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