| Summary: | 碩士 === 大同大學 === 材料工程研究所 === 91 === With the coming global oil crisis, the investigation of new resources, energy-saving and high-efficiency appliances are the topic for the future. The superior optical properties of GaN-based not only provide high efficiency that can be used in light-emitting devices, optical storages, and full-color displays, but also saving the energy resources significantly. When the size of gallium nitride shrinks into nanoscale size. The significantly optical characters and quantum effects has led GaN nanoparticles to a topic of great attention.
This study is focus on studying the structural and optical properties of GaN nanopowders that are synthesized by two kinds of gas condensation methods. The NC GaN has a uniform size distribution and spherical shape. XRD spectra show that the bulk GaN particles are wurtzite structure, and the NC GaN has small domain size and the structure of solid solution phase.
In order to obtain more detailed information on local atomic coordination, Extended X-ray Absorption Fine Structure (EXAFS) is performed on this study. The result shows that the Fourier Transform pattern of bulk GaN is very similar to literature recording. When the size of bulk GaN decreases to nanoscale, the bonding state has been changed into a random arrangement and forming a solid solution phase.
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