Direct Synthesis of Periodic Mesoporous SilicoBoron CarboNitride Frameworks via the Nanocasting from Ordered Mesoporous Silica with Boron‐Modified Polycarbosilazane1. Issue 3 (19th November 2012)

• Record Type: Journal Article
• Authors: Bernard, Samuel; Majoulet, Olivier; Sandra, Fabien; Malchere, Annie; Miele, Philippe; Hur, Bo‐Young; Kim, Seung‐Eun; Banhart, John; Moreno, Francisco García
• Is Part Of: Advanced engineering materials. Volume 15:Issue 3(2013:Mar.)
• Page Start: 134
• Page End: 140
• Publication Date: 2012-11-19
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201200168
• Languages: English
• ISSNs: 1438-1656

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Periodic mesoporous SilicoBoron CarboNitride (Si<sub>3.0</sub>B<sub>1.0</sub>C<sub>3.9</sub>N<sub>1.8</sub>) frameworks with <italic>p6mm</italic> hexagonal symmetry are prepared by a direct nanocasting process of ordered mesoporous silica. After a double infiltration/thermal cross‐linking cycle with a boron‐modified polycarbosilazane (BmPS) of the type [B(C<sub>2</sub>H<sub>4</sub>SiCH<sub>3</sub>NH)<sub>3</sub>]<sub><italic>n</italic></sub> (C<sub>2</sub>H<sub>4</sub>=CHCH<sub>3</sub>, CH<sub>2</sub>CH<sub>2</sub>), the derived BmPS confined in the porous structure of the periodic mesoporous silica template is subjected to a thermal process up to 1000 °C under N<sub>2</sub> to be converted into the Si/B/C/N phase. A short chemical etching with dilute HF eliminates the silica template, which results in the formation of an open, continuous and highly ordered 2D hexagonal Si<sub>3.0</sub>B<sub>1.0</sub>C<sub>3.9</sub>N<sub>1.8</sub> framework as demonstrated by EDX, LA‐XRD, and HRTEM analyses. The highly ordered mesoporous Si<sub>3.0</sub>B<sub>1.0</sub>C<sub>3.9</sub>N<sub>1.8</sub> ceramic displays a specific surface area of 337 m<sup>2</sup> g<sup>−1</sup>, a high pore volume (0.55 cm<sup>3</sup> g<sup>−1</sup>) and a narrow pore‐size distribution centered on 4.6 nm by N<sub>2</sub> sorption with an amorphous network remaining stable during continuous heat‐treatment to 1400 °C in a nitrogen atmosphere.</p> </abstract>