Single-source-precursor synthesis and high-temperature evolution of novel mesoporous SiVN(O)-based ceramic nanocomposites
Single-source-precursor synthesis and high-temperature evolution of novel mesoporous SiVN(O)-based ceramic nanocomposites
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DOI：
10.1016/j.jeurceramsoc.2019.11.021
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发表时间：
2020-12
影响因子：
5.7
通讯作者：
Cong Zhou;A. Ott;R. Ishikawa;Y. Ikuhara;R. Riedel;E. Ionescu
中科院分区：
文献类型：
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作者：
Cong Zhou;A. Ott;R. Ishikawa;Y. Ikuhara;R. Riedel;E. Ionescu
以VO(acac)2修饰的全氢聚硅氮烷和聚苯乙烯的混合物为原料制备了介孔SiVN(O)陶瓷。所得非晶单相 SiVN(O) 陶瓷在氮气气氛中高达 1400°C 时仍保持非晶态。所制备的材料由分散在非晶 Si3N4 中的纳米级氮化钒组成；暴露于 1600°C 会导致 VN 和 Si3N4 结晶。 SiVN(O)基陶瓷的比表面积(SSA)和孔径可以通过热处理温度和聚苯乙烯的量容易地控制。所制备的SiVN(O)陶瓷的平均孔径为4-10nm，在800℃和1000℃氨解时分别获得最大SSA值642和506m2/g。金属改性的单源前体和封装的致孔剂的组合提供了一种方便的一锅合成工艺来制备具有可控相组成和形貌的介孔陶瓷纳米复合材料。
Mesoporous SiVN(O) ceramics were prepared from a mixture consisting of VO(acac)2-modified perhydropolysilazane and polystyrene. The resulting amorphous single-phase SiVN(O) ceramics remained amorphous in nitrogen atmosphere up to 1400 °C. The as-prepared materials consist of nanoscaled vanadium nitride dispersed in amorphous Si3N4; exposure to 1600 °C leads to the crystallization of VN and Si3N4. The specific surface area (SSA) and the pore size of the SiVN(O)-based ceramics can be easily controlled by the temperature of thermal treatment and by the amount of polystyrene. The average pore size of the prepared SiVN(O) ceramics was 4–10 nm and their largest SSA values, 642 and 506 m2/g, were achieved upon ammonolysis at 800 and 1000 °C, respectively. The combination of metal-modified single-source precursors and encapsulated porogens provides a convenient one-pot synthesis process to prepare mesoporous ceramic nanocomposites with controllable phase compositions and morphology.