Metal Oxide and Bimetallic Nanostructures on Planar Titania Surfaces

在分析和表面化学计划的支持下，德克萨斯大学奥斯汀分校的怀特教授和他的同事们正在研究纳米氧化物和双金属表面上含氧小分子的光和热诱导化学。利用一种新的疏水/亲水图案化方法，在平面的二氧化钛表面沉积了纳米尺寸的钛和氧化钼颗粒，以及金/铜双金属颗粒。用扫描隧道显微镜、热脱附谱和X射线光电子能谱研究了这些结构表面上反应的动力学和机理。这项基础研究的信息对于发展对氧化物和双金属材料纳米颗粒的反应性的理解很重要。纳米材料的表面化学反应活性可能在重要方面不同于块状氧化物和双金属材料的表面反应性。这项研究项目由德克萨斯大学的怀特教授和他的团队进行，解决了这个重要的问题。采用疏水/亲水图案化方法，制备了钛、钼氧化物纳米结构表面以及Au/Cu双金属纳米粒子，并进行了表征。然后使用标准的UHV表面化学探头检测这些材料的表面化学。这一基本信息对于发展对纳米材料反应性的理解至关重要，这些纳米材料用于许多技术应用。

AbstractCHE-0412609White/TexasWith the support of the Analytical and Surface Chemistry Program, Professor White and his coworkers at the University of Texas at Austin are investigating the photo and thermal induced chemistry of small oxygen containing molecules on nanostructured oxide and bimetallic surfaces. Using a novel hydrophobic/hydrophilic patterning method, they are depositing nanometer sized titanium and molybdenum oxide particles, as well as Au/Cu bimetallic particles on planar TiO2 surfaces. Scanning tunneling microscopy, thermal desorption spectroscopy, and X-ray photoelectron spectroscopy are used to examine the kinetics and mechanisms of the reactions on these structured surfaces. Information from this fundamental research is important for developing an understanding of the reactivity of nanoparticles of oxide and bimetallic materials.The surface chemical reactivity of nanometer sized materials is likely to differ in important ways from the surface reactivity of bulk oxide and bimetallic materials. This research project, carried out by Professor White and his group at the University of Texas, addresses this important question. Using a hydrophobic/hydrophilic patterning method, nanostructured surfaces of titanium and molybdenum oxides, as well as Au/Cu bimetallic nanoparticles are prepared and characterized. The surface chemistry of these materials is then examined using standard UHV surface chemistry probes. This fundamental information is crucial for developing an understanding of the reactivity of nanomaterials for use in many technical applications.