- 期刊
濕式化學法合成高熵合金奈米晶體
Synthesis of High-entropy-alloy Nanocrystals Using Wet Chemical Method
摘要
高熵合金由五種或五種以上等量或大約等量的元素所組成，自2004年被台灣本土研究團隊提出後即受到高度的重視。高熵合金擁有優異的機械與物理化學特性及應用潛力，其性質主要由多元素均勻混合之高熵效應、結晶學的嚴重晶格扭曲效應、動力學領域之延遲擴散效應以及多種效應混合所導致之雞尾酒效應影響與詮釋。近年來將高熵合金奈米化並應用於電、熱催化與能源領域掀起一波研究熱潮，歸因於高熵合金之組成－性質之高度可調控性與特殊之電子結構，然由於其複雜之生長機制，將高熵合金奈米化相對尚屬未知卻具有無數可能性。有鑑於此，我們整理了目前高熵合金奈米化之合成方法，並系統性討論濕式化學合成相關研究進展與優勢。除此之外，我們也歸納目前合成高熵合金奈米晶體所面臨的挑戰與未來合成及應用端之發展契機。
並列摘要
High-entropy alloys (HEA), incorporating five- or more elements in a solid solution phase, is first proposed by a Taiwan research group in 2004. They hold great promise for many applications owing to their excellent mechanical and physicochemical properties, which are one of the hottest areas in science and engineering. The characteristics of HEA can be attributed to four core effects: (i) The high entropy effect originates from the mixing of multiple elements. (ii) The lattice distortion effect originates from the large difference in atomic sizes. (iii) The sluggish diffusion effect originates severe lattice distortion effect, which is related to the kinetic barrier of atomic diffusion. (iv) The cocktail effect is caused by the synergistic response between multiple components. In recent years, HEA nanoparticles exhibit extraordinary performance as catalysts for energy-related applications. The almost unlimited combinations of materials and tunable electronic properties are expected to provide untold scientific and technological potential. However, owing to the very limited control over the complex nucleation and growth processes of HEA nanoparticles, it has been very difficult to control the synthesis of HEA nanoparticles. In this review, we introduce the synthetic methods of HEA nanoparticles and further discuss the development of wet chemical synthesis. In addition, we also indicate some current challenges in the synthesis of HEA nanoparticles, together with their potential solutions.