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Title: A novel aqueous route to fabricate ultrasmall monodisperse lipophilic cerium oxide nanoparticles
Authors: Sreeremya, T S
Thulasi, K M
Asha Krishnan
Ghosh, S K
Keywords: Microwave-hydrothermal method
Photovoltaic materia
Nonpolar solvents
Nanocrystalline ceria
CeO2 particles
Homogeneous precipitation
Issue Date: 11-Jan-2012
Publisher: American Chemical Society
Citation: Industrial & Engineering Chemistry Research 51(1):318-326;11 Jan 2012
Abstract: Ultrasmall monodisperse 2.3 nm CeO2 nanoparticles have been synthesized by simple ammonia precipitation of cerium nitrate in a mixed glycol water solvent and phase transferred into apolar solvents. Cerium oxide crystal surfaces were passivated with oleic acid (OA) by reflux under ambient pressure conditions. OA molecules were chemisorbed on the ceria nanoparticle surfaces.Preferential growth of the {100} planes has been observed, ascribed to restricted growth of {111} faces due to adsorbed OA. The surfacted CeO2 nanoparticles were dispersed into a stable, colloidal suspension of fine particles in hydrocarbon solvents. The CeO2 nanocrystals were characterized by X-ray diffraction, Fourier transform infrared spectra, and Raman spectral methods. Transmission electron microscopic images and photon scattering studies proved that the colloidal particles in hydrocarbon solvent were indeed monocrystalline with one crystallite per particle, monodispersed with a narrow size distribution
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