沸石晶種自組裝合成中孔洞奈米粒子與垂直中孔道薄膜之結構鑑定和應用

Abstract

本研究混合陽離子型及陰離子型界面活性劑於水中，並以正癸烷所為微胞擴孔劑、與沸石晶種自組裝成中孔洞奈米粒子。此類奈米粒子，不僅具有高表積（700-1000 m2/g）、高孔體積（1-1.5 mL/g）及規則性中孔洞（3-8 nm）、微孔洞（~0.7 nm）之分佈，並在適時基材引入之下，於界面上可生長出公分級的中孔洞沸石薄膜材料。經由各類實驗參數之調控，薄膜材料可具有高規則排列之六角型中孔洞，並以電子顯微鏡與低掠角X光散射來分析此薄膜之厚度及中孔洞形貌、結構。垂直於基材之沸石中孔洞薄膜材料，其熱穩定性及高孔洞表面積不僅可用來負載各類觸媒並用於催化反應，其限制空間及垂直方向性亦可用來生長具方向性奈米材料，提供一個生長大面積低維度半導體之低溫溶液法策略。Here we introduce self-assembly of tri-component micelle system, including cationic, anionic surfactants and neutral decane to grow pore-expanded mesoporous zeolitic nanoparticles with high surface areas (700-1000 m2/g), large pore volume (1-1.5 mL/g), uniform mesopore (3-8 nm) and micropore sizes (~0.7 nm). By introducing rigid substrates, vertically-aligned mesoporous zeolitic thin films were grown in centimeter size. These thin films are composed of highly-ordered hexagonal mesopores which can be examined by electron microscopy and scattering techniques. Additionally, these thin films are partially crystalline with good thermal stabilities and high surface area to load nano-sized catalysts as well as to grow oriented 1D nanowires, indicative of a new strategy for low temperature fabrications of large-area low-dimensional semiconductors.