Stabilization of monodispersed spherical silica particles and their alignment with reduced crack density
- Stabilization of monodispersed spherical silica particles and their alignment with reduced crack density
- 조소혜; 박수영; 김찬수; 최벽파; 박종구
- silica; photonic crystal; alignment; monodispersed spherical silica; heat treatment; crack destiny
- Issue Date
- Colloids and surfaces. A, Physicochemical and engineering aspects
- VOL 441, 354-359
- Monodispersed spherical silica nanoparticles synthesized by the Stöber process contain large amountsof impurities and adsorbed- and structural water which cause structural and thermal instability of themicrospheres. Proper heat treatment was applied to remove the impurities and water endowing theparticles with high thermal and structural stability suitable for post-processes. Intrinsic changes of as-prepared silica particles during heat treatment at 550◦C were thoroughly examined by TGA, FT-IR, SAXS,TEM and SEM characterization. The annealed silica particles became much more reliable building blocksfor a self-assembled thin film, as evidenced by low crack/defect density in the fabricated film. In thispaper, we provide a method of stabilizing silica particles and thereby aligning them into a close packedstructure without macroscopic defects. This method is potentially useful for the delicate silica alignmentfor patterning and fabrication of high-quality photonic crystals adequate for optical switches, wave-guides, lasers and antireflective films for solar cells.
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