Photochemistry in nanotechnology and catalysis

光化学和物理有机化学的范式指导我们的战略，以合成、修饰和利用纳米结构材料，这些材料包括半导体、等离子体和酸碱结构，用于催化和健康应用。新材料是为催化、水分解/处理和健康方面的特定应用而设计的。复杂纳米结构的合成，特别是用光化学方法，将半导体如二氧化钛和Nb2O5与金属或它们的氧化物(金、银、铜、铂、钯、Ru、钴、镍和钴)结合在一起。这些新材料使我们能够进行所有方面的工作，并为HQP培训提供了良好的基础。*催化在我们的研究中发挥着重要作用，包括氧化还原、C-H活化和C-C偶联反应。我们在光氧化还原催化反应方面的成功用廉价的染料和半导体取代了昂贵的过渡金属催化剂，这使我们开发出了多功能催化剂，如Pd-On-TiO2，其中热或不同的激发波长控制反应结果，而Cu-On-TiO2光催化剂可以在可见光下按需驱动点击化学。不同的金属及其组合为解决有机化学挑战提供了新的机会。*我们密切关注化学转化，避免使用“黑箱”催化方法。其中，从分子到摩尔利用单分子光谱学(SMS)和激光闪光光解(LFP)所获得的知识来启发实验室规模的改进。我们计划研究可以从这些方法中受益的有机反应。我们可以制造和评估新的催化剂性能，并使用SMS和成像方法来激励小试规模的进展。*感兴趣的领域是水的分解/净化，它们经常被视为正交场，利用阳光来生产氢气或净化水，然而，它们是密切相关的。对水分解的研究利用了太阳光、半导体催化以及经常被称为“牺牲电子供体”的分子，这些分子以贵重化学物质的降解为代价促进了氢气的释放。在一种新的方法中，我们提出了水污染物可以充当牺牲品供体，在提高氢气产量的同时同时净化水(化学和细菌学)。初步测试表明，当地河流的水比纯净水产生更多的氢气，因为轻微的污染物起到了牺牲捐赠者的作用。在光催化剂的发展中，我们将水的分解和净化视为同一问题的两个方面。我们建议将制氢和水净化作为耦合过程。*在健康和化妆品方面，我们的研究重点是纳米材料的抗菌性能以及有机外壳对化妆品材料的影响，例如木质素涂层的二氧化钛，这是一种主要的防晒成分，具有木质素可以防止的不良健康影响。

The paradigms of photochemistry and physical organic chemistry guide our strategies for the synthesis, modification and utilization of nanostructured materials incorporating semiconductor, plasmonic and acid-base structures for catalysis and health applications. New materials are designed for specific applications in catalysis, water splitting/treatment and health. The synthesis of complex nanostructures, especially using photochemistry, combine semiconductors such as TiO2 and Nb2O5 with metals or their oxides (Au, Ag, Cu, Pt, Pd, Ru, Co, Ni, & Co). These new materials enable all aspects of our work and provide an excellent basis for HQP training.***Catalysis plays a major role in our research, including redox, C-H activation and C-C coupling reactions. Our success in photoredox catalysis reactions replacing expensive transition metal catalysts with inexpensive dyes and semiconductors led us to develop versatile catalysts such as Pd-on-TiO2 where heat or different excitation wavelengths control the reaction outcome, while Cu-on-TiO2 that can drive click chemistry on demand under visible light. Different metals and their combinations open new opportunities to address organic chemistry challenges. ***We look intimately at chemical transformations, avoiding the ‘black-box' approach to catalysis. Among these, from the molecule to the mole takes advantage of knowledge acquired using single molecule spectroscopy (SMS) and laser flash photolysis (LFP) to inspire bench scale improvements. We plan to examine organic reactions that can benefit from these approaches. We can manufacture and evaluate new catalyst performance, and use SMS and imaging methodologies to inspire bench scale advances.***An area of interest is water splitting/decontamination that have been frequently treated as orthogonal fields, using sunlight to either produce H2 or decontaminate water, yet, they are intimately related. Research on water splitting has utilized solar light, semiconductor catalysis and frequently “sacrificial electron donors”, molecules that facilitate H2 evolution at the expense of the degradation of valuable chemicals. In a novel approach, we propose that water contaminants can act as sacrificial donors, enhancing H2 production while simultaneously decontaminating water (chemically & bacteriologically). Initial tests show that waters from local rivers produce more H2 than pure water, as minor contaminants act as sacrificial donors. In the development of photocatalysts, we view water splitting and purification as two facets of the same problem. We propose H2 production and water decontamination as coupled processes.***In health and cosmetics our studies focus on antibacterial properties of nanomaterials and the effect of organic shells on cosmetic materials, such as lignin-coated TiO2, a major sunscreen ingredient with a reputation for adverse health effects that lignin can prevent.