We report on GaAs/MCM-41 heterostructures synthesized by
deposition of GaAs into the channels of MCM-41 using metalloorganic chemical vapor deposition. MCM-41 consists
of an ordered array of silica tubules
comprising pores with uniform and controllable diameter in the
nanometer range. The GaAs/MCM-41
heterostructures show blue-shifted absorption and broad visible
photoluminescence even at room temperature.
The photoluminescence maximum depends on the MCM-41 pore diameter
supporting formation of size-quantized semiconductor crystallites whose growth is restricted by the
diameter of the pores of MCM-41.
The shift in the photoluminescence spectra as a function of the
excitation wavelength suggests a broad size
distribution of the GaAs particles crystallized on the outside of
MCM-41 and a relatively narrow size distribution
of the GaAs particles inside the channels of MCM-41.
Seemingly monophasic Zn-doped ceria nanocrystals contain substantial amounts of X-ray amorphous ZnO not detectable by standard XRD. This ZnO can be incorporated upon annealing at temperatures up to 1300 °C.
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