Optical properties of GaAs confined in the pores of MCM-41

Article Abstract:

The first inclusion of GaAs in the pores of MCM-41 is reported. Of special concern is the optical characterization of a direct-gap semiconductor heterostructure synthesized by deposition of GaAs into the channels of MCM-41 using metalloorganic chemical vapor deposition. The GaAs/MCM-41 heterostructures exhibit blue-shifted absorption and broad visible photoluminescence even at room temperature. The MCM-41 pore diameter determines the photoluminescence, thus supporting formation of size-quantized semiconductor crystallites whose growth is restricted by the diameter of the pores of MCM-41.

Optical properties, Semiconductors, Gallium arsenide

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Photocatalytic dechlorination of aqueous carbon tetrachloride solutions in TiO2 layer systems: a chain reaction mechanism

Article Abstract:

Efficient dechlorination occurs with ultraviolet photolysis of TiO2 nanocrystallite layers in contact with aqueous solutions containing both CCl4 and methanol. It has been possible to achieve quantum yields much higher than one for the first time.

Carbon tetrachloride, Chlorination

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