共查询到19条相似文献,搜索用时 52 毫秒
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量子点因具有优异的光电特性,近年来备受关注。但量子点的规模化应用因受到其加工工艺及稳定性等因素限制而尚待开发。量子点-聚合物纳米复合材料的出现有效弥补了这一问题,将量子点分散到有机聚合物中形成纳米复合材料,集合量子点与聚合物的各自优势于一体,是解决量子点当前应用问题的一种有效方法,具有显著的发展潜力。文中介绍了量子点的主要制备技术,并在此基础上对量子点-聚合物复合材料的制备方法及其在激光器、发光二极管、光电探测器、量子点电视等光电子器件中的应用进展进行了概述,最后对其在光电器件领域的应用进行了展望。 相似文献
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和传统的独立式电容器技术相比,埋入式电容器技术可提高硅组装的效率、改善电性能、降低电子装配的成本。为满足无线电、RF(射频)便携式通讯产品的需求,将电容日器和印制线路板合为一体,而开发一种满足电子、可靠性和工艺要求的材料具有很大的挑战性。先前的εr=150的记录只是在最近才报道过。据我们所知.这是所报道过的最大K(介电常数)值的聚合物复合材料。本工作中,开发了一种新型的具有超离介电常数(εr~1000)的环氧基复合材料。高介电常数是通过提高聚合物基体中的导电填料的含量获得的。这种新型超高K值的材料还具有低损耗(<0.02)、好的粘接强度和理想的多芯片模块层压工艺兼容性。使用这种材料和旋涂技术制作了一种电容密度为100nF/cm^2的埋入式电容器。这种新型材料是下一代电子产品用集成电容器理想的侯选材料。 相似文献
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研究了金属PTC陶瓷复合材料的介电行为。研究表明,金属-PTC陶瓷在电场作用下,由于正负电荷、晶格畸变和空位缺陷等而产生空间电荷极比使金属PTC陶瓷复合材料有较高介电常数。介电损耗频率谱和介电常数温度谱上都再现一个介电损耗峰,其主要原因是跃迁极化,金属阳离子由一个位置跃迁到另一个位置,在介电损耗峰民常数峰所对应的频率和温度时出现跃迁极化率最大。 相似文献
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球形铁电陶瓷颗粒—聚合物复合材料的热释电性 总被引:2,自引:0,他引:2
基于球形增强颗粒复合材料的热应力分析,从理论上推导了包含乘积效应的球形铁电陶瓷颗粒-聚合物复合材料热释电系数和热释电优值的公式。 相似文献
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采用真空蒸发、溅射和化学镀铜的方法分别对研制的PTFE基复合介质进行了金属化处理。试验结果表明:经萘钠溶液处理后的介质,镀铜后铜层致密光亮,且剥离强度明显高于物理方法金属化的剥离强度。 相似文献
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Determining the Dielectric Constants of Organic Photovoltaic Materials Using Impedance Spectroscopy 下载免费PDF全文
Michael P. Hughes Katie D. Rosenthal Niva A. Ran Martin Seifrid Guillermo C. Bazan Thuc‐Quyen Nguyen 《Advanced functional materials》2018,28(32)
The photovoltaic and electrical properties of organic semiconductors are characterized by their low dielectric constant, which leads to the formation of polarons and Frenkel excitons. The low dielectric constant of organic semiconductors has been suggested to be significantly influential in geminate and bimolecular recombination losses in organic photovoltaics (OPVs). However, despite the critical attention that the dielectric constant has received in literature discussions, there has not yet been a thorough study of the dielectric constant in common organic semiconductors and how it changes when blended. In fact, there have been some inconsistent and contradictory reports on such dielectric constants, making it difficult to identify trends. Herein, at first a detailed explanation of a specific methodology to determine the dielectric constant in OPV materials with impedance spectroscopy is provided, including guidelines for possible experimental pitfalls. Using this methodology, the analysis for the dielectric constant of 17 common neat organic semiconductors is carried out. Furthermore, the relationship between the dielectric constant and blend morphology are studied and determined. It is found that the dielectric constant of a blend system can be very accurately predicted solely based on the dielectric constants of the neat materials, scaled by their respective weight ratios in the blend film. 相似文献
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Lei Shi Changgeng Zhang Yuhan Du He Zhu Qi Zhang Shiping Zhu 《Advanced functional materials》2021,31(8):2007863
Different from the traditional ways for enhancing the dielectric properties of polymers by compositing with rigid electronic conductors, here an alternative strategy is reported via introducing ionically conductive liquid electrolytes as functional fillers. Dielectric constant has significantly improved (up to 600%) by liquid electrolyte inclusions in an elastomer matrix. Moreover, by taking advantage of the inherent transparency of liquid electrolyte fillers, high transparency, good stretchability, and high dielectric constant are achieved simultaneously. Using the composite elastomer, the fabrication of highly sensitive strain sensor is demonstrated with 5–6 times higher sensitivity than the pristine elastomer, and flexible electroluminescent device with greatly lowed driving voltage. The strategy provides new opportunities for novel electroactive polymers, including flexible touchscreen panels and displays, biomimetic soft machines, and smart optics. 相似文献
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介电型电活性聚合物(DEAP)由于其大应变,高效率及高能量密度等优点,在仿生机器人领域具有广泛的应用前景。该文设计制作了一种可实现弯曲变形的DEAP驱动器,根据弹性大变形理论建立驱动器的机电耦合模型,通过微分方程组的迭代求解获得激励电压与输出角度、侧向输出力之间的关系。试验结果表明,在5kV电压下,该驱动器可产生最大75°的弯曲角度,最大侧向输出力达到0.7N。试验结果与理论结果较吻合,验证了驱动器设计与分析的有效性。以该驱动器为驱动单元,构建了一种仿生爬行机器人,初步试验表明了该类型驱动应用于仿生机器人的可行性,可为仿生机器人摆动驱动提供一种新的实现方法。 相似文献