Thin Film Materials and the Minimum Thermal Conductivity

薄膜材料和最小导热系数

• 批准号: 9978822
• 负责人: David Cahill
• 金额: $ 17.45万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9978822&HistoricalAwards=false
• 关键词: Thin; Film; Materials; Minimum; Thermal

ABSTRACTProposal Number: CTS 9978822Principal Investigator: D. CahillThis award is to support studies of the fundamental scientific issues in heat conduction in thin films by lattice vibrations. Thin films and nanometer-scale multilayers of highly disordered materials will be prepared by magnetron sputtering and characterized by Rutherford backscattering spectroscopy, scanning electron microscopy and x-ray reflectivity. Heat transport in these materials will be quantified using the 3-omega method in the temperature range 35-500 K, and longitudinal speeds of sound will be measured using picosecond ultrasonics. This combination of measurements will facilitate a detailed comparison between the thermal conductivity data and the minimum thermal conductivity model. The objective is to establish a greater understanding of the mechanisms that create high and low thermal conductivities in thin film materials with large disorder. This new knowledge is also expected to expand the range of thin film thermal properties that are available for applications.

建议编号：CTS 9978822首席研究员：D.Cahill该奖项是为了支持对晶格振动薄膜热传导的基础科学问题的研究。采用磁控溅射方法制备高度无序材料的薄膜和纳米级多层膜，并用卢瑟福背散射光谱、扫描电子显微镜和X射线反射率对其进行表征。这些材料中的热传输将在35-500K的温度范围内使用3-omega方法进行量化，并将使用皮秒超声波测量声音的纵向速度。这种测量的组合将有助于在热导率数据和最小热导率模型之间进行详细的比较。其目的是更好地理解在具有大无序的薄膜材料中产生高和低导热系数的机制。这一新知识还有望扩大可用于应用的薄膜热性能的范围。