Synthesis and Characterization of Thin Film Insulators: Application to Inelastic Electron Tunneling Spectroscopy

薄膜绝缘体的合成和表征：在非弹性电子隧道光谱中的应用

• 批准号: 8805612
• 负责人: Ursula Mazur
• 金额: $ 12.78万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-15 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8805612&HistoricalAwards=false
• 关键词: Synthesis; Characterization; Thin; Film; Insulators

This Research Opportunities for Women Research Initiation Award project is in the general area of Analytical and Surface Chemistry and in the subfields of thin film deposition and inelastic tunneling spectroscopy (IETS). The IETS technique has been limited by the reactivity of the substrate materials commonly used and their tendency to decompose or reduce the adsorbate species. The Principal Investigator will synthesize, by ion-beam deposition, a broad spectrum of new insulating thin-film substrates with varying reactivity and electron-transfer properties suitable for application with IETS. The film materials will include metal oxides, metal nitrides, mixed metal oxides, and diamond-like carbon. Structural characterization of the films will be performed by electron microprobe analysis, transmission electron microscopy, infrared spectroscopy and IETS. Tunneling spectra of a number of adsorbed probe molecules will be measured in order to classify the substrate materials with respect to their barrier quality and chemical inertness. Electronic and vibrational spectroscopies utilizing photons as probes have contributed greatly to our knowledge of the structure, bonding and reactivity of materials. They are limited, however, by the selection rules that govern photon emission, absorption and scattering. Inelastic electron tunneling is not limited by these optical selection rules and is thus a powerful tool for spectroscopic characterization of adsorbed molecular species. Low-lying electronic transitions and both allowed and forbidden vibrational modes can be detected. Development of a catalog of insulating materials with sufficient diversity that virtually any molecular species can be matched to a relatively inert substrate for spectroscopic investigation will greatly enhance the general utility of this technique. It will find increased application both in fundamental molecular spectroscopy and in technologically relevant fields such as corrosion, adhesion, catalysis and microelectronic device fabrication.

该女性研究启动奖项目的研究机会属于分析和表面化学的一般领域以及薄膜沉积和非弹性隧道光谱（IETS）的子领域。 IETS 技术受到常用基材材料的反应性及其分解或减少吸附物质的倾向的限制。 首席研究员将通过离子束沉积合成一系列新型绝缘薄膜基板，这些基板具有不同的反应性和电子转移特性，适合 IETS 的应用。 薄膜材料将包括金属氧化物、金属氮化物、混合金属氧化物和类金刚石碳。 薄膜的结构表征将通过电子微探针分析、透射电子显微镜、红外光谱和 IETS 进行。 将测量许多吸附探针分子的隧道光谱，以便根据基材的阻隔质量和化学惰性对基材材料进行分类。 利用光子作为探针的电子和振动光谱学极大地增进了我们对材料结构、键合和反应性的了解。 然而，它们受到控制光子发射、吸收和散射的选择规则的限制。 非弹性电子隧道效应不受这些光学选择规则的限制，因此是吸附分子物种光谱表征的有力工具。 可以检测低位电子跃迁以及允许和禁止的振动模式。 开发具有足够多样性的绝缘材料目录，实际上任何分子种类都可以与相对惰性的基底相匹配以进行光谱研究，这将大大增强该技术的通用性。 它将在基础分子光谱学和腐蚀、粘附、催化和微电子器件制造等技术相关领域得到越来越多的应用。