Ordered Mesoporous Silicoboron Carbonitride Materials via Preceramic Polymer Nanocasting

详细信息    查看全文

• 作者：Xing-Bin Yan ; Laura Gottardo ; Samuel Bernard ; Philippe Dibandjo ; Arnaud Brioude ; Hicham Moutaabbid ; Philippe Miele
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：October 28, 2008
• 年：2008
• 卷：20
• 期：20
• 页码：6325-6334
• 全文大小：375K
• 年卷期：v.20,no.20(October 28, 2008)
• ISSN：1520-5002

文摘

Highly ordered two-dimensional (2D) mesoporous silicoboron carbonitride (SiBCN) materials were prepared by a double nanocasting approach using mesoporous SBA-15 silica as starting template. The latter was converted into its negative replica CMK-3 carbon template, which was subsequently impregnated with a boron-modified polysilazanes of the type [B(C₂H₄SiCH₃NCH₃)₃]_n ([C_14.4H_31.4N_4.1B_1.0Si_3.0]_n) using a liquid-phase impregnation (LPI) process. The derived [B(C₂H₄SiCH₃NCH₃)₃]_n-carbon composite was cross-linked under ammonia at 200 °C and then thermolyzed under nitrogen at 1000 °C to generate a SiBCN-carbon composite. The carbon template was subsequently removed through thermal treatment at 1000 °C in an ammonia atmosphere to generate ordered mesoporous structures. XRD and TEM analyses revealed that as a negative replica of the CMK-3 template, the obtained amorphous mesoporous material exhibited open, continuous, and ordered 2D hexagonal frameworks, whereas elemental analyses indicated the formation of materials with an empirical formula of Si_3.0B_1.0C_4.2N_3.5. The ordered mesoporous Si_3.0B_1.0C_4.2N_3.5 material displayed high surface area (600 m² g⁻¹), high pore volume (0.61 cm³ g⁻¹), and narrow pore size distribution (around 3.4 nm) and exhibited a relatively good thermal stability in air through heat-treatment to 1400 °C.