Surface-modified CuO layer in size-stabilized single-phase Cu[sub 2]O nanoparticles

Balamurugan, B.; Mehta, B. R.; Shivaprasad, S. M.
November 2001
Applied Physics Letters;11/5/2001, Vol. 79 Issue 19, p3176
Academic Journal
Activated reactive evaporation has been used to grow copper oxide nanoparticles in the size range of 8–100 nm. X-ray diffraction spectra clearly show the presence of a single Cu[sub 2]O phase. Detailed x-ray photoelectron spectroscopy studies show an increase in the ionicity of the Cu[sub 2]O system with decreasing particle size. Depth profiling and finger printing of x-ray photoelectron spectra reveal that the Cu[sub 2]O nanoparticles are capped with a CuO surface layer of thickness approx. 1.6 nm. This study strongly suggests that the stabilization of the cubic Cu[sub 2]O nanophase is enhanced by the formation of a CuO surface layer. © 2001 American Institute of Physics.


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