Nanophase Inorganic Materials Chemistry

这项授予密苏里大学罗拉分校Jay A.Switzer的跨学科奖项得到了化学部的先进材料计划和材料研究部的固态化学计划的支持。研究的重点是在恒流振荡电极电位的条件下，从水溶液中电沉积具有量子受限光电性质的层状纳米结构和超晶格。从碱性乳酸铜溶液中电沉积高度各向异性的铜/氧化亚铜多层膜。研究了振荡周期、振幅、波形、成分和膜层厚度与pH、浓度、电流密度、温度、辐照强度和沉积衬底的关系。用X射线衍射仪、扫描隧道显微镜、扫描电子显微镜和透射电子显微镜对多层膜进行表征。利用电化学石英晶体微天平对沉积过程进行实时跟踪。通过透射谱和镜面反射光谱研究了氧化亚铜薄膜的光学性质与氧化亚铜厚度的关系。氧化铜薄膜表现出与量子限制相一致的蓝移和共振隧穿的负微分电阻特性。随着计算机和其他电子设备尺寸的缩小，隧道设备将变得越来越重要。

This interdisciplinary award to Jay A. Switzer at the University of Missouri-Rolla is supported by the Advanced Materials Program in the Chemistry Division and the Solid-state Chemistry Program in the Division of Materials Research. The focus of the research is the electrodeposition of layered nanostructures and superlattices with quantum-confined optical and electrical properties from aqueous solution under conditions of oscillating electrode potential at constant current. Highly anisotropic copper/cuprous oxide multilayers will be electrodeposited from alkaline copper lactate solution. The dependence of oscillation period, amplitude, wave shape, composition and layer thickness will be studied as a function of pH, concentration, current density, temperature, irradiation intensity and deposition substrate. The multilayers will be characterized by x-ray diffraction, scanning tunneling microscopy, scanning electron microscopy and transmission electron microscopy. The deposition process will be followed in real time by use of the electrochemical quartz crystal microbalance. The dependence of the optical properties on the cuprous oxide layer thickness will be studied by transmission and specular reflectance spectroscopy.Copper oxide films show blue-shifting consistent with quantum confinement and negative differential resistance characteristic of resonant tunneling. Tunneling devices will become increasingly important as dimensions shrink in computers and other electronic devices.