Chemical Characterization of Arrays of TiO2 Nanocolumns

摘要提案题目：二氧化钛纳米柱阵列的化学表征提案号：cts -0553243首席研究员：Charles B. mullins机构：德克萨斯大学奥斯汀分校分析（决定的理由）：由高多孔的平面二氧化钛纳米柱阵列组成的薄膜将通过反应气相沉积在一个掠射角上生长。预计这种薄膜将具有有用的化学性质，因为(i)薄膜具有高的固有表面积，（ii）组成薄膜的单个纳米柱具有降低的尺寸，以及（iii）薄膜具有高浓度的表面缺陷。这些特性以及二氧化钛的固有特性表明，二氧化钛纳米柱阵列具有促进有用的催化化学过程的潜力。该项目的进一步研究包括对TiO2纳米柱进行化学修饰（最初通过添加氮），以修饰/增强表面化学的选择性和/或活性。电子显微镜、x射线衍射和超高真空表面科学技术将用于物理和化学表征纯膜和化学改性膜。最初的研究将集中在水的解离，氮氧化物的减少，以及使用这些薄膜的甲醇的部分氧化。在这个项目中，学生将与太平洋西北国家实验室的两位资深科学家合作，并与各自所在机构的两位资深教师一起进行研究。来自代表性不足群体的学生将被招募参与研究项目。从广泛的角度进行指导将是项目的关键组成部分。参与该项目的学生将在地方和国家会议上以及通过档案期刊、书籍章节和评论论文交流他们的发现。一些发现的结果将包含在课程作业材料中。

AbstractProposal Title: Chemical Characterization of Arrays of TiO2 Nanocolumns Proposal Number: CTS-0553243Principal Investigator: Charles B. MullinsInstitution: University of Texas at AustinAnalysis (rationale for decision):Films consisting of highly porous, planar arrays of titania (TiO2) nanocolumns will be grown by reactive vapor deposition at a glancing angle. It is anticipated that such films will have useful chemical properties since (i) the films have high intrinsic surface area, (ii) the individual nanocolumns which compose the film have reduced dimensionality, and (iii) the films have a large concentration of surface defects. These qualities, along with the intrinsic properties of TiO2, suggest that titania nanocolumnar arrays have potential for promoting useful catalytic chemical processes. Further investigations in the project involve chemically-modifying the TiO2 nanocolumns (initially by adding nitrogen) in order to modify/enhance the selectivity and/or activity of the surface chemistry. Electron microscopy, x-ray diffraction, and ultrahigh vacuum surface science techniques will be used to physically and chemically characterize both the pure and chemically modified films. Initial studies will focus on the dissociation of water, the reduction of NOx, and the partial oxidation of methanol employing these films. In this project students will collaborate with two senior scientists at the Pacific Northwest National Laboratory in addition to conducting research with two senior faculty members at their home institution. Students from under-represented groups will be recruited for involvement in the research project. Mentoring from a broad perspective will be a key component of the project. The students involved in the project will communicate their findings at local and national meetings as well as through archival journals, book chapters, and review papers. Some of the discovered results will be included in course-work materials.