發光矽碳奈米點與二氧化矽之奈米複合物的合成及其應用

本研究透過簡易的熱處理過程製備出發光矽碳奈米與二氧化矽的奈米複合物（SiC-dots/SiO2），並成功應用於螢光微影蝕刻技術、多色放光薄膜的製作與甲醇燃料電極陰極材料應用。透過由3-氨基丙基三甲氧基矽烷（APTMS）經水熱法所製成的SiC-dots溶液進行水解縮合合成SiC-dots/SiO2後，藉由熱處理方法，分別進行60 °C加熱60分鐘、300 °C加熱10分鐘與20分鐘，可製成具有藍色、綠色與黃褐色放光的SiC-dots/SiO2（B-SiC-dots/SiO2、G-SiC-dots/SiO2與T-SiC-dots/SiO2）粉末及薄膜。依據本身的粒子尺寸大小、成分組成與形態變化，所製備的B-、G-與T-SiC-dots/SiO2其螢光放光波長可從455 nm調控至574 nm，藉由調整激發光源（360, 460, 520 nm），B-、G-與T-SiC-dots/SiO2能得出至少七種以上的放光組合。透過加熱導致螢光改變的概念，本研究使用近紅外線雷射（NIR laser）於B-SiC-dots/SiO2薄膜上進行微影技術（lithography）的文字刻劃，而本工作也是第一個證明C-dot具有潛力作為微影技術的材料的應用。此外，B-、G-與T-SiC-dots/SiO2亦具有電化學催化活性，於鹼性環境中可作為燃料電池的陰極材料用於催化氧氣還原反應（oxygen reduction reaction, ORR）。由於B-、G-與T-SiC-dots/SiO2具有特殊放光性質與電化學催化活性，以及操作安全、快速簡便、毒性低、環保、原料安全便宜易取得之優勢，相信在未來具有絕佳的潛力用於光學顯示器（如白光發光二極體），多色螢光薄膜以及燃料電池的陰極材料。

關鍵字

矽碳奈米與二氧化矽的奈米複合物；光致發光碳量子點；光蝕刻圖騰；燃料電池；多色放光薄膜

並列摘要

Preparation of various colors of photoluminescent SiC-dots/SiO2 nanocomposite through a simple heating process and their application in fabrication of lithographic patterns and colorful films have been demonstrated. Blue（B）-, green（G）-, and tan（T）-SiC-dots/SiO2 powders have been prepared from SiC-dots, which were synthesized from 3-aminopropyl trimethoxysilane （APTMS）, through simple condensation process and hydrothermal route by controlling heating at 60 °C for 60 min, and further calcination at 300 °C for 10 and 20 min, respectively. The emission wavelengths of as-prepared SiC-dots/SiO2 vary from 455 to 574 nm, depending on their morphologies and surface properties. B-, G-, and T-SiC-dots/SiO2 glass films show at least 7 colors when excited at 360, 460, and 520 nm. Through heat induced photoluminescence change, a representative lithographic pattern of B-SiC-dots/SiO2 films has been fabricated using a near infrared （NIR） laser. The B-, G-, and T-SiC-dots/SiO2 also possess great electrocatalytic activity for oxygen reduction reaction （ORR）. Having such interesting PL and electrical properties, the stable, low-toxic, and cost-effective B-, G-, and T-SiC-dots/SiO2 show great economic potential in many fields such as light-emitting diodes, photoluminescent films and fuel cells.