Thermal decomposition of carbon-rich polymer-derived silicon carbonitrides leading to ceramics with high specific surface area and tunable micro- and mesoporosity
Thermal decomposition of carbon-rich polymer-derived silicon carbonitrides leading to ceramics with high specific surface area and tunable micro- and mesoporosity
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DOI：
10.1016/j.jeurceramsoc.2011.08.020
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发表时间：
2012-02
影响因子：
5.7
通讯作者：
R. M. Prasad;Gabriela Mera;K. Morita;K. Morita;M. Müller;H. Kleebe;A. Gurlo;C. Fasel;R. Riedel
中科院分区：
文献类型：
--
作者：
R. M. Prasad;Gabriela Mera;K. Morita;K. Morita;M. Müller;H. Kleebe;A. Gurlo;C. Fasel;R. Riedel
在这里，我们报告的SiCN聚合物衍生的陶瓷的热分解，导致具有高比表面积和定义的孔径的材料。通过热解的富碳的聚（二苯基甲硅烷基碳二亚胺）前体，并通过改变的热处理参数，即温度，退火时间和使用额外的退火步骤，得到的陶瓷。SiCN陶瓷的热分解与非晶氮化硅相与过量碳的碳热反应有关，这种有害事件导致这些材料的比表面积高达568 m2 g-1，并形成微孔和中孔。高分辨率TEM研究已经证实，孔仅嵌入在碳相中。此外，还讨论了孔隙尺寸与游离碳相组织的关系。
Herein we report on the thermal decomposition of SiCN polymer-derived ceramics leading to materials with high specific surface area and defined pore sizes. The ceramics were obtained by means of pyrolysis of a carbon-rich poly(diphenylsilylcarbodiimide) precursor and by varying the thermolysis parameters, namely temperature, annealing time and using additional annealing steps. The thermal decomposition of SiCN ceramics is correlated with the carbothermal reaction of amorphous silicon nitride phase with excess carbon and this detrimental event leads to high specific surface area up to 568m2g−1and micro- and mesopores formation in these materials. High-resolution TEM investigations have confirmed that the pores are embedded only in the carbon phase. Moreover, the relationship between the pore sizes and the organization of free carbon phase is discussed.