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.

PI：乔纳森·马伦（Jonathan A. 有机无机杂交材料是电子，光子学和能量转换的单晶半导体的有吸引力替代品，因为它们可以通过可扩展的基于溶液的工艺制造。对于这些应用，有机无机界面已被利用以控制电子传输，但是热性能仍然没有培养。假设在有机无机界面上出现的集体特性将能够对混合材料中的热声子谱进行前所未有的控制。该提案的智力优点围绕两种新型混合材料的热运输实验测量：自组装单层（SAM）和纳米晶体超级晶格（NCSL）。 SAM是在无机表面形成的2-D分子晶体，NCSL是有机分子间隔间隔的无机球的3-D阵列。有机和无机成分中不同振动状态的耦合和比对可以通过化学控制以产生各种热运输特性。 这些效果将通过（i）开发一种新的连续波激光方法来询问这些效果，以探测固体中无与伦比的声子平均自由路径的无与伦比范围，（ii）测量导热率和声子在NCSL中的平均自由路径分布，以及（iii）SAM界面热电导的系统测量。操纵声子频谱的能力将广泛影响能量和生物学中的广泛应用。 由于短声子波长（10 nm），基于混合的声子镜可以比具有更长波长的可见光获得更高的分辨率。 这种非破坏性成像在生物，有机和无机样品的测定中非常有用。此外，基于溶液化学的制造和可调的电光特性使杂种非常适合需要广泛部署的能量转换技术，包括热电学，光伏和LED。工程混合设备需要了解其迄今未知的热性能，而声子控制可以产生独特的性能升级。 通过SAM对声子进行带通滤波可以提高光电子的效率，而脱钩的热和电子传输特性使NCSLS使NCSLS非常适合热电废物热转化。 “声子模拟器”强调了一种渴望揭开声音神秘化的综合教育计划，这是一种模拟物质振动的模型弹簧质量系统。该教育套件将与在线软件配对，并在整个匹兹堡公立学校（PPS）中部署，以通过互动教育计划介绍传热的起源。 当地的重点将是PPS和Carnegie Mellon的学生的代表性不足的预科学生。 英特尔国际科学与工程博览会和西门子竞赛的研讨会将实现更广泛的传播，旨在共同招募学者从事工程。