Optical and microstructural characterization of chemically synthesized gallium nitride nanopowders
作者:
Kenneth E. Gonsalves,
Sri Prakash Rangarajan,
Greg Carlson,
Jayant Kumar,
Ke Yang,
Mohamed Benaissa,
M. Jose´-Yacama´n,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 15
页码: 2175-2177
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119565
出版商: AIP
数据来源: AIP
摘要:
Thermal decomposition of an amido precursor; [Ga2(NMe2)6,Me=CH3] in an ammonia atmosphere yielded nanostructured gallium nitride powder. The x-ray diffraction spectrum of the nanosized gallium nitride exhibited reflections corresponding to the lattice planes of fcc (zinc blende) GaN. High resolution transmission electron microscopy confirmed the cubic structure of the material and evidence of stacking faults within the fcc structure. Infrared spectra showed the characteristic Ga–N stretch at550 cm−1.Transmission electron microscope measurements indicated that the GaN consisted of≈50 nmsized particles which in turn are agglomerates of smaller particles with ≈5 nm domain sizes. The photoluminescence (PL) emission spectrum of the GaN was found to be sensitive to the excitation wavelength exhibiting peaks at 378 and 317 nm. The PL excitation spectrum showed resonances in the 200–300 nm region. These PL results suggest the effect of quantum confinement in these GaN particles. ©1997 American Institute of Physics.
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