合成不同大小之氧化亞銅奈米方塊及其應用

Synthesis of Various-sized Cu2O Nanocubes and Their Applications

潘尹捷(Yin-Jie Pan)

指導教授 ： 李紫原

國立清華大學/工學院/材料科學工程學系/碩士(2014年)

摘要

本研究利用溼式化學還原法以抗壞血酸為還原劑在鹼性環境下可以在短時間製備大量且均勻的氧化亞銅奈米方塊，再透過螯合劑的添加控制成核點的數目，調控氧化亞銅奈米方塊的大小(15 - 550 nm)。螯合劑越多，氧化亞銅奈米方塊越大；螯合能力越強，奈米方塊越大。我們也發現反應物添加順序的改變，也可以改變奈米方塊的大小。不同大小的氧化亞銅奈米方塊被應用於吸附、光催化以及葡萄糖感測。奈米方塊越小，吸附、光催化以及葡萄糖感測器的表現越好。15 nm的奈米方塊具有高比表面積以及帶正電的表面電位，在25 ppm 80 mL甲基橙溶液中只需花70分鐘即可吸附近乎99 %，遠優於活性碳粉的吸附表現。而照光更可使其降解，在氙燈照射下只需花30分鐘即可去除溶液中的甲基橙。同時，15 nm的奈米方塊在葡萄糖感測中，在0.005 - 1.5 mM的線性範圍下具有最高靈敏度366.2 µA mM-1 (R2 = 0.9953)。

關鍵字

氧化亞銅奈米方塊 ； 吸附 ； 光催化 ； 葡萄糖感測器

並列摘要

Uniform Cu2O nanocubes were synthesized via wet chemical reduction method using ascorbic acid in alkali solution in short reaction period, which is simple, easy to mass production and cost-effective. Size of Cu2O nanocubes were adjusted by nucleation. Adding chelating agent markedly affects the concentration of Cu2+(aq), resulting in less amount of Cu2O nucleuses, which leads to significantly enlarged the size of Cu2O. The smallest Cu2O nanocubes can be synthesized by further adjusting the addition sequence of the reagents. Various-sized Cu2O nanocubes were applied in the application of adsorption, photocatalyst and glucose sensing. The smallest Cu2O nanocubes have the best performance when used in those applications. At 25 ppm MO, 15 nm Cu2O nanocubes with high surface area and positive zeta potential needs 70 min to reach the adsorbed percentage of approximately 99 %, which performs even better than that of conventional activated carbon. Under Xe lamp irradiation, the concentration of 25 ppm MO lowered to about 1 % just after 30 min. Furthermore, the smallest Cu2O nanocubes (15 nm) also exhibits a high sensitivity of 366.2 µA mM-1 (R2 = 0.9953) and linear range between 0.005 - 1.5 mM.

並列關鍵字

Cu2O nanocubes ； adsorption ； photocatlyst ； glucose sensing

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