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; 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.

摘要质量编号：CTS 9978822原理研究者：D。Cahillthis Award旨在支持晶格振动中薄膜中热传导中基本科学问题的研究。高度无序材料的薄膜和纳米尺度的多层将由磁控溅射制备，并以卢瑟福的反向散射光谱，扫描电子显微镜和X射线反射率来制备。 这些材料中的热传输将使用35-500 K的温度范围内的3-员点进行量化，并将使用Picsecond Ultramonics测量声音的纵向速度。 测量的组合将有助于导热率数据与最小导热率模型之间的详细比较。 目的是对在具有较大疾病的薄膜材料中产生高和低热导率的机制有更深入的了解。预计这种新知识还可以扩大可用于应用的薄膜热特性的范围。