Nanopowders of gallium nitride GaN surface functionalized with manganese
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- 作者：Michał Musiał ; Jacek Gosk ; Andrzej Twardowski…
- 刊名：Journal of Materials Science
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：52
- 期：1
- 页码：145-161
- 全文大小：1,428 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Characterization and Evaluation Materials
Polymer Sciences
Continuum Mechanics and Mechanics of Materials
Crystallography
Mechanics - 出版者：Springer Netherlands
- ISSN：1573-4803
- 卷排序：52
文摘
Four GaN nanopowders of systematically varying surface properties, prepared via an anaerobic synthesis method from gallium imide (ammonia assisted decomposition in the range 600–975 °C), were subjected to functionalization with manganese centers. Each powder was slurried in a diluted hexane solution of manganese (II) bis{bis[trimethylsilyl]amide} Mn{N[Si(CH3)3]2}2 and stirred overnight at ambient conditions. This was followed by filtering out of the solid, rinsing it with hexane to remove excess of the manganese precursor, and evacuating volatiles. The raw solid with some adsorbed Mn precursor was then subjected to transamination/deamination chemistry at 200 °C, 18 h, under a flow of ammonia to afford Mn surface-functionalized GaN nanopowders. The powders were thoroughly characterized including investigation of their magnetic properties with a SQUID magnetometer. They were confirmed to have tightly bound manganese and significantly modified surface properties with relatively decreased BET specific surface areas and helium densities. Magnetic measurements were consistent with the formation of a paramagnetic surface (Ga,Mn)N-type of phase and some antiferromagnetic by-product, the latter formed from adventitious oxidation of excessive quantities of the manganese precursor.