Vapor−Solid Reaction for Silicon Carbide Hollow Spherical Nanocrystals
Vapor−Solid Reaction for Silicon Carbide Hollow Spherical Nanocrystals
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DOI：
10.1021/jp073012g
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
Zhenyu Liu;L. Ci;N. Jin-Phillipp;M. Rühle
中科院分区：
文献类型：
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作者：
Zhenyu Liu;L. Ci;N. Jin-Phillipp;M. Rühle
我们报道了碳化硅（SiC）空心球形纳米晶体的合成，使用碳纳米颗粒和硅和二氧化硅混合物产生的一氧化硅蒸气之间的气固反应。空心球形纳米颗粒的直径与原始碳纳米颗粒的直径有关，显示出形状记忆效应。空心球形纳米晶的厚度可以通过硅化程度和碳纳米颗粒多层结构来控制。不同的分析技术记录的非晶碳到石墨碳的sp2键状态的结构，并进一步到碳化硅的sp3类金刚石碳键状态的结构的相转化。空心球形纳米晶体可能在催化、控制输送、气体储存、低介电纳米材料、隔音和纳米复合材料中找到应用。
We report the synthesis of silicon carbide (SiC) hollow spherical nanocrystals using a vapor−solid reaction between carbon nanoparticles and silicon monoxide vapor generated from a mixture of silicon and silica. The hollow spherical nanocrystal diameters are related to the diameters of the pristine carbon nanoparticles, showing a shape memory effect. The thickness of the hollow spherical nanocrystals can be controlled by the siliconization degree and carbon nanoparticle multilayer structures. Different analysis techniques recorded the phase conversion of the amorphous carbon into graphitic carbon in the structure of the sp2 bond state and further into SiC nanocrystal in the structure of the sp3 diamond-like carbon bond state. The hollow spherical nanocrystals might find applications in catalysis, controlled delivery, gas storage, low-dielectric nanomaterials, acoustic insulation, and nanocomposites.