CAREER: Multi-Scale Study of Transport Phenomena in Printable Electronics for Enhanced Microstructure and Properties

职业：可印刷电子器件中输运现象的多尺度研究，以增强微观结构和性能

• 批准号: 0846825
• 负责人: Ying Sun
• 金额: $ 40万
• 依托单位: SUNY at Binghamton
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-03-01 至 2009-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0846825&HistoricalAwards=false
• 关键词: CAREER; Multi; Scale; Study; Transport

0846825Y. SunThis career plan will advance the fundamental understanding of transport processes of inkjet-printed functional materials on flexible substrates through the integration of innovative research and education. The proposed research combines novel modeling and experiments that include: (i) in-situ observation and multi-scale modeling of the flow, heat and mass transfer induced by the interplay of wetting, evaporation, and self-assembly of inkjet-deposited materials; (ii) laser and plasma substrate surface modification for improved deposition in a roll-to-roll (R2R) format; and (iii) microstructural and electrical-thermalmechanical property characterization of deposited material. The focus is on the mesoscopic scale, where Marangoni flow, evaporation, and particle self-assembly can be directly observed. A lattice Boltzmann model will be developed to directly simulate drop impact and evaporation on surface modified substrates; particle-particle, particle-carrier liquid, and particle-substrate interactions; and final morphology of deposited particulate materials. In contrast to previous experiments that have only been concerned with post-mortem analysis of deposited structures, the proposed experiments will integrate ultrafast confocal microscopy and micro-particle image velocimetry systems to monitor in real-time particle self-assembly during the evaporation phase and to provide model validations. The maskless laser patterning combined with plasma etching alters substrate surface energies and hence provides wetting controls for a confined deposition. The laser-created patterns with increased surface areas due to ablative roughening will enhance adhesion of the deposited materials. Modern characterization techniques (e.g., SEM, TEM, AFM, nano-indentation, and infrared microscopy) will be used to determine final microstructures as well as electrical, thermal, and mechanical properties of deposited materials.Intellectual Merit: Environmentally-benign R2R electronics fabrication using inkjet printing and direct laser patterning on flexible substrates is an enabling technology that will provide desired high-volume, low-cost production of flexible electronics. The proposed work will yield important understanding of how the final microstructure and properties of deposited materials depend on the electronic ink formulation, processing conditions, and substrate properties. The intrinsic limits on the spatial accuracy of ink-jetting devices, wetting, de-wetting, contact line pinning, interfacial instabilities, microflows within the deposited drop, and the self-assembly of particulate matter during drop evaporation all contribute to the lack of precise control of deposited electronic materials. The pre-patterned substrate surface will provide preferential wetting and dewetting of the inkjetted material and better substrate adhesion. This will enable more reliable deposition patterns with better edge definition, higher resolution, and improved electrical-thermal-mechanical properties of printable electronics and devices. This project will also impact other research frontiers on complex fluids involving phase change and particle assembly.Broader Impacts: This project is an excellent fit to the strategic directions of the Center for Advanced Microelectronics Manufacturing, a national microelectronics R2R manufacturing R&D center at Binghamton. Knowledge obtained from this project will have a dramatic impact on the processing of printable electronics, ranging from low-cost consumer products, solar cells, and low-power lighting to highly specialized small scale sensors and healthcare devices. The integrated education plan seeks to enhance thermo-fluid science education through the development of new courses to highlight multiscale modeling and nanoscale phenomena at both graduate and undergraduate levels. As an offshoot of the proposed computational modeling work, courseware for virtual thermo-fluid laboratories will be developed. Through recruiting visits at local secondary schools and involvement with the local Society of Women Engineers chapter, a sustained effort to attract women and other under-represented students in engineering programs will be made. Printable electronics will be demonstrated at the Watson Engineer's Week Open House and through Summer Science Camp at the Discovery Center in Binghamton. Seminars on the processing of flexible electronics for mid-career professionals will emphasize on the structureproperty-performance relationships. The partnership with Endicott Interconnect on laser surface treatment will enable internship opportunities and foster the research to innovation transition. The collaboration with novel ink and substrate providers (e.g., Corning) will allow us to customize ink and substrate formulas for each specific application. The joint effort between the PI and Computer Science faculty at Binghamton will advance the grid computing capability via the partnership with the New York State Grid.

0846825Y。SunThis职业计划将通过创新研究和教育的整合，推进对柔性基板上喷墨打印功能材料运输过程的基本理解。 拟议的研究结合了新颖的建模和实验，包括：（i）对喷墨沉积材料的润湿、蒸发和自组装相互作用引起的流动、传热和传质的原位观察和多尺度建模;（ii）激光和等离子体基底表面改性，以改善卷对卷（R2 R）格式的沉积;和（iii）沉积材料的微观结构和电-热-机械性能表征。重点是在介观尺度上，在那里可以直接观察到Marangoni流，蒸发和粒子自组装。将开发格子玻尔兹曼模型，以直接模拟表面改性基材上的液滴冲击和蒸发;颗粒-颗粒、颗粒-载液和颗粒-基材相互作用;以及沉积颗粒材料的最终形态。与以前只关注沉积结构的事后分析的实验相比，拟议的实验将整合超快共聚焦显微镜和微粒子图像测速系统，以实时监测蒸发阶段的粒子自组装，并提供模型验证。与等离子体蚀刻相结合的无掩模激光图案化改变了衬底表面能，因此为受限沉积提供了润湿控制。由于烧蚀粗糙化而具有增加的表面积的激光产生的图案将增强沉积材料的粘附性。现代表征技术（例如，SEM、TEM、AFM、纳米压痕和红外显微镜）将用于确定最终的微观结构以及沉积材料的电学、热学和机械性能。智力优势：使用喷墨打印和直接激光图案化在柔性基板上进行环保R2 R电子制造是一项使能技术，将提供所需的柔性电子产品的大批量、低成本生产。拟议的工作将产生重要的理解如何最终的微观结构和沉积材料的性能取决于电子墨水配方，加工条件和基板性能。对喷墨装置的空间精度、润湿、去润湿、接触线钉扎、界面不稳定性、沉积液滴内的微流以及液滴蒸发期间颗粒物质的自组装的固有限制都导致缺乏对沉积电子材料的精确控制。预图案化的基底表面将提供喷墨材料的优先润湿和去润湿以及更好的基底粘附。这将实现具有更好的边缘清晰度、更高的分辨率和可印刷电子器件和设备的改进的电-热-机械特性的更可靠的沉积图案。该项目也将影响其他研究前沿复杂流体涉及相变和粒子assembly.Broader影响：该项目是一个非常适合的先进微电子制造中心，在宾厄姆顿国家微电子R2 R制造研发中心的战略方向。从该项目中获得的知识将对可印刷电子产品的加工产生巨大影响，从低成本消费品，太阳能电池和低功耗照明到高度专业化的小型传感器和医疗保健设备。综合教育计划旨在通过开发新课程来加强热流体科学教育，以突出研究生和本科生水平的多尺度建模和纳米现象。作为拟议的计算建模工作的一个分支，虚拟热流体实验室的课件将开发。通过在当地中学进行招聘访问和参与当地女工程师协会分会，将持续努力吸引妇女和其他代表性不足的学生参加工程项目。可打印电子产品将在沃森工程师周开放日和宾厄姆顿探索中心的夏季科学营中展示。为职业生涯中期的专业人士举办的柔性电子产品加工研讨会将强调结构-性能关系。与恩迪科特互连在激光表面处理方面的合作将提供实习机会，并促进研究向创新的过渡。与新型油墨和基材供应商（例如，康宁）将允许我们为每个特定应用定制油墨和承印物配方。PI和宾厄姆顿计算机科学学院之间的共同努力将通过与纽约国家电网的合作关系推进网格计算能力。