Surface Science and Optical Spectroscopy Studies of Oligothiophene Adsorption on Clean and Oxygen-Dosed Aluminum Surfaces

清洁和掺氧铝表面上低聚噻吩吸附的表面科学和光谱研究

• 批准号: 0089960
• 负责人: James Whitten
• 金额: $ 29.19万
• 依托单位: University of Massachusetts Lowell Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0089960&HistoricalAwards=false
• 关键词: Surface; Science; Optical; Spectroscopy; Studies

The aim of this project is to investigate the adsorption of thiophene oligomers on well-characterized aluminum surfaces are proposed. X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) studies at a variety of temperatures will be performed to examine the organic layer/aluminum interface formed by exposing clean, single crystal and polycrystalline aluminum surfaces to gas phase, vacuum-sublimed, or x-ray-formed oligothiophenes. XPS will provide information regarding chemistry that is occurring at the interface, and UPS will be used to determine the electronic valence structure of the metal and how it changes upon oligothiophene adsorption. These results will be correlated with work function and optical spectroscopy measurements. Adsorption of a variety of substituted thiophene oligomers will also be studied at different temperatures on single crystals of aluminum, and low energy electron diffraction (LEED) and photoluminescence will be performed to search for evidence of oligomer ordering. Surface photovoltaic spectroscopy measurements will also be carried out to investigate changes in the position of the Fermi level that occur upon absorption of light. Oligothiophene coadsorption on oxygen-dosed aluminum surfaces and on aluminum oxide will also be investigated to determine how adsorption on these surfaces differs from on clan aluminum. Weaker chemical interaction is expected on the oxygen-expose surfaces, and possibilities should exist for oligothiophene alignment. Thermal desorption spectroscopy and LEED will be used to assess adsorption/desorption behavior and ordering of the adsorbed oligomers.%%%Aluminum is commonly used as an electrode material for polymeric light-emitting diodes (LEDs), field-effect transistors and photovoltaics, and substituted thiophenes are an important class of polymers for these types of devices. Device materials are of significant importance to industry, and students trained in these areas compete well in the job market. This project is being jointly supported by The Solid-State Chemistry Program in The Division of Materials Research and The Advance Materials and Processing Program in the Chemistry Division.

该项目的目的是研究噻吩寡聚物在特征良好的铝表面上的吸附。 将在各种温度下进行X射线和紫外光谱光谱（XPS和UPS）研究，以检查通过暴露清洁，单晶和多晶铝表面形成的有机层/铝界面，以使气相中的气相，真空吸收，呈空，呈现的，含有X-ray-hay-X-ray-formothipothipothipothelesemed-opothipothipophepothe-opothe-opothe-opothipothesemed-opothe-opothe-opothipothesemed-opothipopheenes。 XPS将提供有关在界面处发生的化学性质的信息，UPS将用于确定金属的电子价结构以及在寡噻吩吸附时如何变化。 这些结果将与工作函数和光谱测量相关。 还将在铝的单晶上的不同温度下研究各种取代的硫烯寡聚物的吸附，并将进行低能电子衍射（LEED），并将进行光致发光以寻找寡聚序列的证据。 还将进行表面光伏光谱测量，以研究吸收光后费米水平的位置的变化。 还将研究在氧剂量表面和氧化铝上的寡噻吩共同吸附，以确定这些表面上的吸附与铝铝的吸附方式。 预计在氧膨胀表面上的化学相互作用较弱，并且应存在寡噻吩比对的可能性。 热解吸光谱和LEED将用于评估吸附/解吸行为和吸附寡聚物的顺序。%%%%铝通常用作聚合物光发射二极管（LED）的电极材料（LED），现场效应晶体管和光伏和替代品的thiiphers everimens everimens everemens everems ans everemens everemens everemens everemess everemens everemess everemess everemers是这些型号。 设备材料对行业至关重要，在这些领域接受培训的学生在就业市场上竞争良好。 该项目在材料研究部以及化学部的预先材料和加工计划中共同支持了固态化学计划。