FUNCTIONALIZED DIAMONDOIDS AND THEIR ELECTRONIC PROPERTIES FOR FIELD EMISSIONS

NSF化学部的分析和表面化学项目将支持斯坦福大学的Nicholas Melosh教授和Justus-Liebig大学Giessen的Peter Schreiner教授的国际合作研究项目。这个国际合作研究项目将研究金刚石的基本性质和应用，金刚石是一种新发现的纳米级碳。类金刚石分子由2-6个融合在一起的金刚石笼组成，结合了金刚石的显着特性和纳米材料的均匀性和功能性。教授Melosh和Schreiner及其学生将研究如何以高特异性对这些材料进行化学修饰，并确定这些分子取代基如何影响电子和结构行为。金刚石的介电常数，带隙，电子亲和力，能级排列的范围内的属性将使用紫外光电子能谱，场发射，微波探针和电子隧道的组合进行测量。金刚石是研究纳米材料中电子结构如何发展的独特模型系统，因为它们是分子纯的，原子均匀的，并且包括尺寸和形状的系统序列。基于类金刚石薄膜与氢封端金刚石的相似性，预计类金刚石薄膜将显著影响涉及电子发射的技术应用，例如显示器。类金刚石表面的场电子发射和电子发射将揭示金刚石和类金刚石结构如何增强表面发射，这可能导致新一代坚固的显示器和照明。这项国际合作研究项目由NSF和德国的Deutsche Forschungsgemeinschaft（DFG）共同支持。这项研究也得到了NSF国际科学与工程办公室（OISE）的支持。

The Analytical and Surface Chemistry Program at NSF Division of Chemistry will support the international collaborative research project of Prof. Nicholas Melosh of Stanford University and Prof. Peter Schreiner of Justus-Liebig University Giessen. This international collaborative research project will examine the fundamental properties and applications of diamondoids, a newly discovered nanoscale form of carbon. Diamondoid molecules consist of 2-6 diamond cages fused together, combining both the remarkable properties of diamond with the uniformity and functionality of a nanomaterial. Profs. Melosh and Schreiner and their students will investigate how these materials can be chemically modified with high specificity, and determine how these molecular substituents affect electronic and structural behavior. Diamondoid properties ranging from dielectric constant, band gap, electron affinity, and energy level alignment will be measured using a combination of ultraviolet photoemission spectroscopy, field emission, microwave probes and electron tunneling. Diamondoids are unique model systems to examine how electronic structure develops in nanomaterials because they are molecularly pure, atomically uniform, and include a systematic sequence of sizes and shapes. Diamondoid thin films are expected to significantly impact technological applications involving electron emission, such as displays, based upon their similarity to hydrogen-terminated diamond. Field- and thermionic- electron emission from diamondoid surfaces will reveal how diamond and diamond-like structures enhance surface emission, which could lead to a new generation of robust displays and lighting.This international collaborative research project is supported jointly by NSF and the Deutsche Forschungsgemeinschaft (DFG) in Germany. The study is also supported by the Office of International Science and Engineering (OISE) at NSF.