Colloidal Crystal Templating of Two-Dimensionai Ordered Macroporous SiCN Ceramics

摘要

Colloidal crystals, as templates, have attracted much attention in fabrication of versatile specially structured functional materials [1-7],, In this fabricating process, the target product materials are 'fixed' into the voids of a template,. After suitable treatment, the target composition with the designed morphologies and structures is finally replicated after removing the template. Based on this procedure, the periodic sphere-inversed structure is attracting much attention, with much having been accomplished, e.g. three-dimensional ordered macroporous (3DOM) materials and two-dimensional ordered macroporous (2DOM) materials.Three-dimensional (3D) colloidal crystals are typically used for the preparation of highly periodic porous materials [1-4], They have many potential applications, including utilization as photonic crystals, bio-sensors, waveguide materials, and optoelectronics,. Two-dimensional (2D) ordered macroporous arrays have attracted much attention as a result of their applications in biosensors, catalysts, etching masks, magnetic materials, and phonon diffraction gratings [5-7].In particular, it is anticipated that non-oxide eventually will be used as catalytic supports that operate under harsh conditions due to their high thermal, mechanical, and chemical stabilities. However, only a few reports have been issued regarding periodic nanostructured non-oxide ceramics, although the polymeric route to non-oxide ceramics via wet fabrication and subsequent pyrolysis offers a unique opportunity to manufacture conventional ceramic components [8-9],Here, a simple method to prepare long-range ordered macroporous SiCN ceramics using a solution dipping method based on the 2D SiCh monolayers is presented. To the best of the authors' knowledge, this is the first report regarding two-dimensional ordered SiCN ceramics directly using the 2D SiC>2 monolayers as template.