Collisions of Hyperthermal Polyatomic Ions with Organic Thin Films

该项目由Vicki H. Wysocki和她的学生在亚利桑那大学的分析和表面化学计划的支持下，开发了一种新型的表面表征工具，以提供有机薄膜最外层原子层中存在的官能团的定性鉴定和定量。 该方法的核心是使用原子和多原子离子与这些表面的超热碰撞，以及随后的离子/表面反应，中和产率，射弹解离效率和化学溅射的研究，以确定表面组成。 超热碰撞被用来研究单一组分和混合组分模型表面，其中许多是由硫醇盐自组装单分子膜和Langmuir-Blodgett膜。 接触角、FTIR、原子力显微镜、椭偏仪和XPS测量也被用作表面组成的独立分析探针。亚利桑那大学的Wysocki教授和她的学生使用缓慢移动的离子与表面的仔细控制碰撞来揭示这些表面上有机覆盖层的组成。 通过对入射离子使用更复杂的结构来揭示表面的微妙特征。 表面和入射离子之间的化学反应也被用来揭示结构和成分。 入射离子的速度很慢，这意味着只有表面的几个原子层才能被检查。 这种薄膜的反应性和结构在诸如传感器、催化剂和新型电子器件等领域中是主要的感兴趣领域。

This project, carried out by Professor Vicki H. Wysocki and her students at the University of Arizona and supported by the Analytical and Surface Chemistry program, develops a novel surface characterization tool to provide qualitative identification and quantification of the functional groups present in the outermost atomic layers of organic thin films. The core of the method is use of hyperthermal collisions of atomic and polyatomic ions with these surfaces, and subsequent study of ion/surface reactions, neutralization yields, projectile dissociation efficiency, and chemical sputtering to determine the surface composition. Hyperthermal collisions are used to study single composition and mixed composition model surfaces, many of which are composed of thiolate self-assembled monolayers and Langmuir-Blodgett films. Contact angle, FTIR, atomic force microscopy, ellipsometry, and XPS measurements are also used as independent analytical probes of the surface composition.Professor Wysocki and her students at the University of Arizona use the carefully controlled collisions of slow moving ions with surfaces to reveal the composition of the organic overlayers on those surface. Subtle features of the surface are revealed by using more complex structures for the incoming ions. Chemical reactions between the surface and the incoming ions are also used to reveal structure and composition. The slowness of the incoming ion means that only the top few atomic layers of the surface are examined. Reactivity and structure of such thin films is of major interest area in areas such as sensors, catalysis, and new electronic devices.