Journal
JOURNAL OF APPLIED PHYSICS
Volume 105, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3080131
Keywords
bismuth compounds; catalysis; crystal growth from solution; energy gap; magnetic particles; nanoparticles; nanotechnology; particle size; photochemistry; radiation effects; size effect; weak ferromagnetism
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Funding
- NSF of China [50425721, 50621201]
- the Scientific Research Foundation for the Returned Overseas Chinese Scholars
- State Education Ministry, and the National Basic Research of China (973 Program) [2007CB613301, 2009CB623303]
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Nanostructured BiFeO3 particles have been synthesized by a hydrothermal method, and the effects of particle size on photocatalytic activity and magnetic property of BiFeO3 were investigated. The optical absorption spectra indicate that the band-gap energy increases with decreasing crystalline size due to the quantum-size effect. The enhancement of room-temperature weak ferromagnetism can be observed in nanoscale BiFeO3 particles, which should be attributed to the size-confinement effect on the magnetic ordering. In addition, BiFeO3 nanoparticles with diameter about 5 nm show good photocatalytic performance by photodegradation of Congo red under visible-light (lambda>400 nm) irradiation.
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