奈米光粒子合成、能隙晶體結構製作與應用─子計劃一:奈米發光膠粒合成與粒間作用研究(2/2)

Abstract

本研究第二年主要工作是合成具有核殼結構單徑二氧化矽/二氧化鈦及銦酸鍶螢光粒子，並探討顆粒之間作用行為，及分析顆粒對於光閘晶體之光學性質的影響。實驗使用粒徑均一之二氧化矽顆粒,在強電性斥力下自組成光閘晶體。再利用反應控制,以溶膠凝膠法生成的奈米二氧化鈦顆粒覆蓋於二氧化矽顆粒表面，創造出核殼結構的光閘晶體。銦酸鍶則由硝酸前導溶液反應析出而得。顆粒及組合物之微結構主要利用各種電子顯微鏡進行分析觀察。並以反射光譜分析儀量測其光學性質的變化。組合測試中加入高分子界面劑(PMAA-NH4, PDAAE or PVP)，藉由表面電 性的量測，了解高分子電解質之功能。此外,藉由反射光譜分析儀的量測可知由二氧化矽/二氧化鈦核殼結構所組成的光閘晶體 能有效濾除500nm 反射峰，只保留600nm 處的反射峰，使反射峰的範圍窄化。

The objectives of this study are to synthesize SiO2 core/TiO2 shell and luminescence SrIn2O4 spherical particles, to understand the interparticle forces, and to assemble photonic crystals so to reveal the band gap properties. Nano-sized and homogeneous TiO2 was prepared from the reaction of Ti alkoxide (TBOT) with the water provided by the esterification of butanol and acetic acid. SrIn2O4 was synthesis from nitrate solution. The configurations of the SiO2/TiO2 particles and the microstructure of assembly were characterized by SEM, AFM, and TEM. In addition, the PBG crystals were measured by reflective spectrometer and the particles by ζ-meter, respectively. With the addition of three polymers PMAA-NH4, DAAE, and PVP dispersive role was investigated. The silica/titania core-shell structure could filter the visible light near 500 nm, and sharper the 600 nm spectrum comparing to that of the PBG crystal assembled by mono-silica particles.