Carbons with three-dimensionally periodic porous structures on the scale of optical wavelengths were fabricated by a new template compensation method. Polystyrene (PS) opal crystal was first prepared as a template, and then carbon-dots precursor was infiltrated to fill the voids around the PS spheres. By sintering at high temperature under inert Ar atmosphere, the PS template melted and fused with the C-precursors and then carbonized to from carbon structure. The resulting porous carbons with three-dimensionally periodic pores left by PS spheres have an inverse opal photonic crystal structure, which diffracts lights in visible and near-infrared (NIR) spectral region at a normal light incidence and the diffracted wavelength can be tuned through changing the size of PS spheres. Using as a coating material, the porous carbon can selectively reduce light adsorption and transmission from carbon in certain spectral range through controllable diffraction.

Controlled formation and application of three-dimensional periodic porous carbon structures

ACS Spring 2022

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