Boron nitride hollow nanospheres: Synthesis, formation mechanism and dielectric property
Boron nitride hollow nanospheres: Synthesis, formation mechanism and dielectric property
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DOI：
10.1016/j.materresbull.2014.12.048
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发表时间：
2015-04
影响因子：
5.4
通讯作者：
B. Zhong;X. Tang;X. Huang;L. Xia;Xinyu Zhang;Chaojun Wang;G. Wen
中科院分区：
文献类型：
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作者：
B. Zhong;X. Tang;X. Huang;L. Xia;Xinyu Zhang;Chaojun Wang;G. Wen
利用氨硼烷（NH3 BH 3）在1300 °C下分解生成的蒸汽，成功制备了氮化硼（BN）空心纳米球。最终产物已被广泛的X射线衍射，场发射扫描电子显微镜，透射电子显微镜，和X射线光电子能谱。BN空心纳米球的直径为100 - 300 nm，厚度为30-100 nm。发现产物的内部结构依赖于反应温度。在实验观察的基础上，提出了BN空心纳米球的可能形成机制。X波段（8-12 GHz）微波频率下的介电性能测试表明，BN空心纳米球填充石蜡的介电损耗低于普通BN粉体填充石蜡的介电损耗，表明BN空心纳米球可用作微波雷达罩的低密度填料。
Boron nitride (BN) hollow nanospheres have been successfully fabricated by pyrolyzing vapors decomposed from ammonia borane (NH3BH3) at 1300 °C. The final products have been extensively characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The BN hollow nanospheres were ranging from 100 to 300 nm in diameter and around 30–100 nm in thickness. The internal structure of the products was found dependent on the reaction temperatures. A possible formation mechanism of the BN hollow nanospheres was proposed on the basis of the experimental observations. Dielectric measurements in the X-band microwave frequencies (8–12 GHz) showed that the dielectric loss of the paraffin filled by the BN hollow nanospheres was lower than that filled by regular BN powders, which indicated that the BN hollow nanospheres could be potentially used as low-density fillers for microwave radomes.