کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1496907 | 992979 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and luminescence of nanocrystalline gallium nitride synthesized by a novel polymer pyrolysis route
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structure and luminescence of nanocrystalline gallium nitride synthesized by a novel polymer pyrolysis route Structure and luminescence of nanocrystalline gallium nitride synthesized by a novel polymer pyrolysis route](/preview/png/1496907.png)
چکیده انگلیسی
Thermal decomposition in a horizontal quartz tube reactor of a polymer [-(CH6N4O)3Ga(NO3)3-] in a nitrogen atmosphere, yield directly nano-structured gallium nitride (GaN) powder. The polymer was obtained by the reaction between high purity gallium nitrate (Ga(NO3)3) dissolved in toluene and carbohydrazide as an azotic ligand. The powder synthesized by this method showed a yellow color and elemental analysis suggested that the color is due to some carbon and oxygen impurities in the as-synthesized powder. Electron microscopy showed that the as-synthesized powders consist of a mixture of various porous particles containing nanowires and nano-sized platelets. The size of the crystallites can be controlled by annealing processes under ammonia. Photoluminescence analysis at 10Â K on as-synthesized powders showed a broad red luminescence around 668Â nm under UV laser excitation (He-Cd laser, 325Â nm). However after annealing process the red luminescence disappears and the typical band edge emission of GaN around 357Â nm (3.47Â eV) and the UV band were the dominant emissions in the PL spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 29, Issue 1, October 2006, Pages 19-23
Journal: Optical Materials - Volume 29, Issue 1, October 2006, Pages 19-23
نویسندگان
Rafael Garcia, Gustavo A. Hirata, Alan C. Thomas, Fernando A. Ponce,