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ABSTRACT
Colloidal nanocrystal heterostructures consisting of two or more inorganic phases provide novel approaches in developing multifunctional building block materials. Simultaneously achievable magnetically directed motion and fluorescence imaging with heterostructural materials may find use in biomedical applications. Fe2O3/CdS was synthesized through an aqueous route at ambient temperature. The heterostructure of nanocrystals were obtained by semiconductor materials on magnetic nanoparticles. The crystal structure and crystallinity of materials were first identified by X-ray diffraction (XRD) and Raman scattering measurements. The XRD showed Bragg's reflections related to Fe2O3 and CdS. The as-synthesized hierarchical nanostructure exhibited a weak ferromagnetic character compared to pure ferromagnetic materials due to their low coercivity. A sharp peak of photoluminescence spectra was observed due to surface trap–induced emissions. The optical and magnetic properties of Fe2O3/CdS nanostructures suggest that such nanostructured materials may be useful in optoelectronic and magnetic devices.
Acknowledgments
We thank the Vice-Chancellor of DIAT, Pune, and Alagappa University for support and DST, government of India, for financial support through grant no. SR/S1/PC-39/2010. We are thankful to C. V. V. V. Satyanarayana of NCL, Pune, and Dr. Shaibal Banerjee of DIAT for their constant support. P.K.K. thanks Shreenu Bhanoth for assistance during manuscript preparation. S.V. and V.R. dedicate this article to Varun.