CAREER:Thermal Energy Transport in Organic-Inorganic Hybrid Materials

职业：有机-无机杂化材料中的热能传输

• 批准号: 1149374
• 负责人: Jonathan Malen
• 金额: $ 40万
• 依托单位: Carnegie-Mellon University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-15 至 2017-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1149374&HistoricalAwards=false
• 关键词: CAREER; Thermal; Energy; Transport; Organic

PI: Jonathan A. Malen, Carnegie Mellon UniversityProposal Number: CBET-1149374The objective of this CAREER proposal is to study thermal transport in organic-inorganic hybrid materials. Organic-Inorganic Hybrid Materials are attractive alternatives to single crystal semiconductors for electronics, photonics, and energy conversion because they can be manufactured with scalable solution-based processes. For these applications the organic-inorganic interface has been leveraged to control electronic transport, but thermal properties remain uncultivated. It is hypothesized that collective properties, emergent at the organic-inorganic interface, will enable unprecedented control of the thermal phonon spectrum in hybrid materials. The intellectual merit of the proposal centers around the experimental measurement of thermal transport in two novel hybrid materials: self assembled monolayers (SAMs) and nanocrystal superlattices (NCSLs). SAMs are 2-D molecular crystals that form on inorganic surfaces, and NCSLs are 3-D arrays of inorganic spheres spaced by organic molecules. Coupling and alignment of dissimilar vibrational states in the organic and inorganic components can be controlled by chemistry to yield diverse thermal transport properties. These effects will be experimentally interrogated through (i) the development of a new continuous-wave laser method to probe an unparalleled range of phonon mean free paths in solids, (ii) measurements of thermal conductivity and phonon mean free path distributions in NCSLs, and (iii) systematic measurements of SAM interface thermal conductance.The ability to manipulate the phonon spectrum will broadly impact a wide range of applications in energy and biology. Due to short phonon wavelengths (10 nm), hybrid based phonon-optics would achieve much higher resolution than visible light having much longer wavelengths. Such non-destructive imaging can be extremely useful in assays of biological, organic, and inorganic samples. Further, solution chemistry based manufacturing and tunable electro-optic properties make hybrids ideal for energy conversion technologies that demand wide deployment, including thermoelectrics, photovoltaics, and LEDs. Engineering hybrid devices requires knowledge of their hitherto unknown thermal properties, whereas phonon control can yield unique performance upgrades. Bandpass filtering of phonons by SAMs can increase the efficiency of optoelectronics, while decoupled thermal and electronic transport properties make NCSLs ideal for thermoelectric waste heat conversion. An integrated educational plan that aspires to demystify the phonon is highlighted by the "Phonon-Simulator", a model spring-mass system that simulates vibrations in matter. This educational kit will be paired with online software and deployed throughout the Pittsburgh Public Schools (PPS) to introduce the origins of heat transfer through an interactive educational program. The local focus will be underrepresented pre-college students from PPS as well as students at Carnegie Mellon. Broader dissemination will be achieved by workshops at the Intel International Science & Engineering Fair and the Siemens Competition, aimed at jointly recruiting scholars into engineering.

项目负责人：Jonathan A. Malen，卡内基梅隆大学。项目编号：cbet -1149374。本项目旨在研究有机-无机杂化材料的热传递。有机-无机杂化材料是电子、光子学和能量转换领域单晶半导体的有吸引力的替代品，因为它们可以用可扩展的基于解决方案的工艺制造。在这些应用中，利用有机-无机界面来控制电子输运，但热性能仍未得到培养。据推测，在有机-无机界面上出现的集体性质将使混合材料中的热声子谱得到前所未有的控制。该建议的智力价值集中在两种新型杂化材料的热输运实验测量：自组装单层（SAMs）和纳米晶体超晶格（NCSLs）。SAMs是在无机表面上形成的二维分子晶体，而NCSLs是由有机分子间隔的无机球体组成的三维阵列。有机和无机组分中不同振动态的耦合和排列可以通过化学控制来产生不同的热输运性质。这些效应将通过(i)开发一种新的连续波激光方法来探测固体中无与伦比的声子平均自由程范围，（ii）测量NCSLs中的热导率和声子平均自由程分布，以及（iii）系统测量SAM界面热导。操纵声子谱的能力将对能源和生物领域的广泛应用产生广泛影响。由于声子波长短（10纳米），混合声子光学将获得比波长长得多的可见光更高的分辨率。这种非破坏性成像在生物、有机和无机样品的分析中非常有用。此外，基于溶液化学的制造和可调谐的电光特性使混合材料成为需要广泛部署的能量转换技术的理想选择，包括热电、光伏和led。工程混合设备需要了解其迄今未知的热特性，而声子控制可以产生独特的性能升级。通过SAMs对声子进行带通滤波可以提高光电子学效率，而去耦的热和电子输运特性使NCSLs成为热电废热转换的理想选择。一个旨在揭开声子神秘面纱的综合教育计划被“声子模拟器”所强调，“声子模拟器”是一个模拟物质振动的弹簧质量系统模型。这套教育工具包将与在线软件配对，并在匹兹堡公立学校（PPS）部署，通过互动教育计划介绍传热的起源。当地的重点将是来自PPS的未被充分代表的大学预科学生以及卡内基梅隆大学的学生。更广泛的传播将通过英特尔国际科学与工程博览会和西门子竞赛的研讨会来实现，旨在联合招募工程领域的学者。