| 摘要: | 自1995年以來，清華大學葉均蔚教授首度發表高熵合金設計概念，係指以大於五種以上之元素成分合成，透過高熵效應、晶格扭曲效應、延遲擴散效應和雞尾酒效應性等特性產生之材料，但是目前主流研究大多聚焦於其塊材的各項機械性能。近兩年起陸續有學者將目光轉向開發高熵合金各項不同之用途，在透過奈米化技術後，產生具有高表面積之高熵合金奈米結構應用於催化方面。然而，高熵合金的催化機制在科學界尚未有系統化的釐清，除了起到催化關鍵性的催化金屬元素外，其與其餘合金金屬之協同效應對於反應途徑之影響仍有待探討。有鑑於此，本研究團隊於此計畫中提出各種開發高熵合金奈米結構化技術，將會使用兩種不同製程:(a)濕式化學還原法， (b)雷射轉印生長技術。在高熵合金奈米化後，此外本研究中也探討不同製程高熵合金奈米粒子的光學性質在其表面電漿子共振效應之影響，並透過複合於先期開發成果雙金屬氧化物基板與圖案化陽極氧化鋁等各式基板，分別進行光電催化分解水及二氧化碳還原反應比較其結構與催化效率的差異，此分析結果將與葉均蔚教授團隊就催化與光學性質進行針對性之高熵合金設計，並透過計算機軟體VASP、ATAT和FDTD模擬奈米化高熵合金電漿子之光學性質、元素分佈模型和電漿子共振強電場之共振現象與電催化位能變化計算，藉此模擬成果與實驗結果互相驗證並回饋清華大學葉均蔚教授團隊用以優化高熵合金靶材設計，希望藉此計畫開發奈米化高熵合金之製程技術以及其進行催化性質與光學性質之探討，延伸奈米化高熵合金在不同領域更廣泛之運用。 ;Since 1995, Professor Yeh Jien-Wei in Tsing hua University in Taiwan has published the concept of high-entropy alloys (HEAs) design for the first time. It refers to the synthesis of more than five elemental components, which are produced by high entropy effect, a lattice distortion effect, delayed diffusion effect, and cocktail effect. However, most current research focuses on the buck mechanical properties. In the past two years, some scholars have turned their attention to the development of different applications of using high-entropy alloys. With the development of the nanotechnology, high-energy alloy nanostructures with the high surface area can be fabricated and applied to the other differentfields such as catalytic reactions. However, the catalytic mechanism of highentropy alloy nanostructures have not been systematically clarified and understand. Besides the critical catalytic metal element, how does it work synergistically together with the presence of other metal elements still leave unknown.In this project, our research team proposed two different techniques for the fabrication of high-entropy alloy nanostructures, which include (a) Wet process of chemical reduction, (b) Laser transfer method. After the high-entropy alloy is fabricated, the optical properties of the high-entropy alloy nanoparticles can start to be discussed for example, the effect of the surface plasmon resonance in HEAs. Also these HEAs NPs will be integrated with our previous development of and the double-metal oxide substrate and patterned AAO for the reaction of water splitting and carbon dioxide reduction. The simulation results will also be processed to understand unknown catalytic and optical properties for high-entropy alloys. Moreover, with the usage of VASP, ATAT and FDTD, we can simulate the optical properties of HEA NPs such as the plasmon resonance dipoles, the element distribution model and the distribution area of the plasmonic resonance electric field etc. These results will be feedback to Professor Yeh for the design of high-entropy alloys sputter target to further optimize the catalytic and optical properties of HEAs NPs. Hopefully, with the conduction of this project we can not only understand more about the either catalytic and optical properties of HEAs but also extend the use of high-entropy alloys in a variety of fields. |
