双/多元金属合金纳米材料的液相种子介导生长技术研究

Bi/multi-metallic alloy nanocrystals have attracted enormous research attention due to their unique physiochemical properties in the field of optics and catalysis. However, the development of preparation has been hindered by some technical limitations. The main bottleneck is the lack of for precise control over the nucleation and growth process since most syntheses are one-pot. The aim of this project is to adopt the strategy of seed-mediated growth to fabricate bi/multi-metallic alloy nanomaterials with novel characters in terms of size, morphology, element distribution, among others and explore their applications in catalysis. The project will start with preparation of bi/multi-metallic nanomaterials with high uniform size, morphology, and crystal structure as seeds, followed by the deposition of the bi/multi-metals on seed surface via liquid-phase epitaxial growth. As a result, the step-by-step control of nucleation and growth process can be realized precisely and effectively. By manipulating the growth rate and direction of metals, novel bi/multi-metallic alloy nanomaterials can be readily obtained and the growth pattern and formation mechanism underlying the seed-mediated growth process will also be tracked and investigated. The successful implementation of this project not only generate original results in both theory and experiment, but also keep and enhance the research advantage of our country in the field of metallic nanomaterials.

双/多元金属合金纳米材料由于其在光学和催化领域独特的物理化学特性而引起广泛关注和应用，但其制备技术发展却受到了一些现有技术缺陷的阻碍，主要瓶颈在于合成过程普遍采用一步法，缺乏对于材料的成核和生长过程的精准有效调控。本项目旨在通过运用种子介导液相外延生长法，先行合成具有高度统一尺寸、形貌、晶体结构的金属纳米材料作为“种子”，在种子表面液相外延生长双/多元金属，调节金属原子沉积数量、速度和方向，实现对成核和生长过程的分阶段控制与精准有效调节，制备具有不同尺寸、形貌、元素分布等特征的双/多元金属纳米材料，并对形成过程及机理加以追踪和研究。本项目的成功实施，不仅能在理论和实验上取得原创性成果，而且可以提高和保持我国在金属纳米材料领域的研究优势。

双/多元金属合金纳米材料由于其在光学和催化领域独特的物理化学特性而引起广泛关注和应用。为提高其制备方法可控水平，本项目通过运用种子介导液相外延生长法，先行合成具有高度统一尺寸、形貌、晶体结构的金属纳米材料作为“种子”，在种子表面液相外延生长双/多元金属，调节金属原子沉积数量、速度和方向，实现对成核和生长过程的分阶段控制与精准有效调节，制备了具有不同尺寸、形貌、元素分布等特征的双/多元金属纳米材料，并对形成过程及机理加以追踪和研究。在项目执行期间，发展了多种非常规种子的制备方法，在合成手段上对双金属共还原的方式进行了精确调控，进而制备出多种具有新型结构的多元金属纳米晶，同时对这些特殊形貌结构的形成机理以及晶型变化过程进行了研究和分析，对其在光学和催化领域的应用进行了初步探索。本项目的成功实施推动了多元金属纳米晶的可控制备水平的发展，丰富了材料的形貌结构特征，提高和保持了我国在金属纳米材料领域的研究优势。