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Experimental Evidence for the Quantum Confinement Effect in 3 C -SiC Nanocrystallites

2005; American Physical Society; Volume: 94; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.94.026102

1092-0145

Xiaowei Wu, Jiyang Fan, Teng Qiu, Xingming Yang, G. G. Siu, Paul K. Chu,

Silicon Carbide Semiconductor Technologies

Using electrochemical etching of a polycrystalline 3C-SiC target and subsequent ultrasonic treatment in water solution, we have fabricated suspensions of 3C-SiC nanocrystallites that luminesce. Transmission electron microscope observations show that the 3C-SiC nanocrystallites, which uniformly disperse in water, have sizes in the range of 1-6 nm. Photoluminescence and photoluminescence excitation spectral examinations show clear evidence for the quantum confinement of 3C-SiC nanocrystallites with the emission band maximum ranging from 440 to 560 nm. Tunable, composite polystyrene/SiC film can be made by adding polystyrene to a toluene suspension of the 3C-SiC nanocrystallites and then coating the resulting solution onto a Si wafer.