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We report the enhanced p-type conduction properties in BiCuOSe by doping of monovalent ions (K+). As compared with undoped BiCuOSe, simultaneous increase in both the carrier concentration and the Hall mobility was achieved in the K-doped BiCuOSe. The origin of the enhancement was discussed in terms of the two-band structure in the valence band of the BiCuOSe, and the density of state effective masses of the heavy (∼1.1 me) and light hole (∼0.18 me) were estimated by using Pisarenko relation.

A simple method for the preparation of hollow rock-salt TiO 1Àx N x nanoparticles and their visible-light photocatalytic activities are presented. By thermal annealing of TiO 2 nanoparticles under NH 3 /N 2 gas flow at 800 C, a rock-salt TiO phase was achieved far below its transition temperature to a monoclinic TiO phase (1250 C). The composition of the nanoparticles was revealed to be Ti 0.7 (O 0.67 N 0.33 ) 1 by detailed structural and compositional characterizations, and their structural stability was critically determined by the formation of vacancies and the incorporation of N. The hollow rock-salt TiO 1Àx N x nanoparticles presented efficient visible-light photocatalytic activity, and their origins were discussed.

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