In biomedical science and nanotechnology, it often requires surface multi funcationalization of a nanoparticle or a nanotube. In cancer diagnosis for instance, not only does the nanoparticle need a cavity structure for storage and delivery of drugs, but also be luminescent for diagnosis. Europium doped Y2O3 were deposited on the multi wall carbon nanotube (MWCNTs) surface by a novel solution method. High resolution transmission electron microscopy (HRTEM) experiments were carried out to study the surface morphologies of the deposited rare-earth doped nanophosphors on MWCNTs. The crystal lattice structures of the surface deposits were identified by using selected area electron diffraction. The optical properties of the surface functionalized MWCNTs were characterized by using a fluorescent spectrometer.

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