CAS: Understanding Catalyst Roles in Aluminum Nanocrystal Synthesis

在化学系化学催化项目的支持下，莱斯大学的Naomi Halas教授和明尼苏达大学的Ian Tonks教授正在研究钛催化剂如何控制具有可调结构和物理性质的铝纳米晶体的形成。铸币金属纳米粒子以其光学特性而闻名，这是由于它们的集体电子共振而产生的，称为表面等离子体。这些材料的等离子体特性已被证明支持一系列现象，包括表面增强光谱和光热加热特性。虽然大多数研究都集中在金和银纳米粒子上，但人们对地球上丰富的金属（如铝）的兴趣越来越大。铝纳米晶体的合成是独一无二的，因为它需要钛催化剂。Halas教授和Tonks教授正与他们的研究团队一起研究这些催化剂是如何工作的，以及如何控制它们形成具有可预测结构和功能的铝纳米晶体。这些合作活动还将结合两个研究小组的科学安全专业知识，在大学和催化领域分享最佳实践。虽然铝纳米晶体的合成化学最近才开始被研究，但由于铝的地球丰度和杰出的等离子体特性，人们对制备这些材料很感兴趣。铝纳米晶体的合成不同于贵金属和铸币金属，因为纳米晶体的成核和生长需要催化剂。Halas教授和Tonks教授正在共同研究铝纳米晶体合成的综合机理。结合动力学分析、模型系统和光谱学，结合两个研究小组的催化专业知识，提出的成核机制将被测试，催化剂结构对纳米晶体形态的影响将被调查，催化剂和纳米晶体结构之间的关系将被研究。这些活动将为来自两个研究小组的研究生提供跨学科培训，并支持两所大学之间的化学品安全文化交流和加强。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

With the support of the Chemical Catalysis Program in the Division of Chemistry, Professor Naomi Halas of Rice University and Professor Ian Tonks of the University of Minnesota are studying how titanium catalysts can control the formation of aluminum nanocrystals with tunable structural and physical properties. Coinage metal nanoparticles are well-known for their optical properties that arise due to their collective electronic resonances, known as surface plasmons. The plasmonic properties of these materials have been shown to support a range of phenomena including surface enhanced spectroscopy and photothermal heating characteristics. While most studies have focused on gold- and silver-nanoparticles, there is growing interest in earth-abundant metals such as aluminum. The synthesis of aluminum nanocrystals is unique because it requires a titanium catalyst. Professors Halas and Tonks are working together with their research teams to determine how these catalysts work and how they can be controlled to form aluminum nanocrystals with predictable structures and function. These collaborative activities will also combine the scientific safety expertise of the two research groups to share best practices across universities and catalysis fields.While the synthetic chemistry of aluminum nanocrystals has only recently begun to be investigated, there is significant interest in preparing these materials due to the earth-abundance and outstanding plasmonic properties of aluminum. The synthesis of aluminum nanocrystals is distinct from noble and coinage metals in that a catalyst is required for nanocrystal nucleation and growth. Professor Halas and Professor Tonks are working together to develop a comprehensive mechanistic picture of aluminum nanocrystal synthesis. Using a combination of kinetic analysis, model systems, and spectroscopy that blends the catalytic expertise of the two research groups, proposed mechanisms for nucleation will be tested, the impact of the catalyst structure on nanocrystal morphology will be investigated, and the relationship between catalyst and nanocrystal structure will be studied. These activities will provide interdisciplinary training for graduate students from both research groups and support the exchange and enhancement of chemical safety culture between both universities.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.