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近十年,有机无机杂化钙钛矿凭借其新颖优异的光电特性而引起广泛关注。最近,手性钙钛矿由于结合了钙钛矿材料和手性材料各自独特性能,在三维显示、光学信息处理、量子光学、生物探测、自旋电子等方面具有重要应用价值。根据有机、无机组分的空间分布,可以对手性钙钛矿的结构维度进行分类。本文以手性钙钛矿的不同结构维度为出发点,分别阐述了一维、二维和三维手性钙钛矿的晶体结构、光学和光电特性,包括圆二色性、圆偏振光致发光和光电探测等特性。考虑到二维手性钙钛矿具有独特的范德华层状晶体结构,重点介绍了其与其它二维材料组合成二维异质结构方面的工作。最后,分别从材料制备和器件应用的角度,总结了手性钙钛矿的重点挑战问题和未来发展方向。 相似文献
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高频通信采用的微波高频覆铜板在制作材料的选用时,需要小的介电常数和介电损耗,一般采用PTFE (聚四氟乙烯)作材料,PTFE不沾任何材料且具有较大的热膨胀系数,混入FEP (聚四氟乙丙烯)到PTFE乳液中可以改善不沾任何材料的性质,玻璃纤维布可以改善热膨胀系数大的问题,但是会造成乳液和玻璃纤维之间有空隙。试验研究发现,当FEP含量占乳液30%时,pp片(半固化片)中乳液和玻璃纤维之间的孔隙率达到较小的水平。本实验采用介电损耗(Df)和介电常数(Dk)的比值代表孔隙率的水平,数值越小,表示孔隙率越小。 相似文献
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Room-temperature ferromagnetism observed in Nd-doped In_2O_3 dilute magnetic semiconducting nanowires 下载免费PDF全文
Nd-doped In_2O_3 nanowires were fabricated by an Au-catalyzed chemical vapor deposition method.Nd atoms were successfully doped into the In_2O_3 host lattice structure,as revealed by energy dispersive x-ray spectroscopy,x-ray photoelectron spectroscopy,Raman spectroscopy,and x-ray diffraction.Robust room temperature ferromagnetism was observed in Nd-doped In_2O_3 nanowires,which was attributed to the long-range-mediated magnetization among Nd~(3+)-vacancy complexes through percolation-bound magnetic polarons. 相似文献
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We investigate the magnetic damping parameter of Fe1-xCrx thin films using the time-resolved magneto-optical Kerr effect technique.It is demonstrated that the overall effective damping parameter is enhanced with the increasing Cr concentration.The effective damping at high field α0 is found to be significantly enhanced when increasing the Cr concentration with the α0=0.159 in the Fe45Cr55 enhanced by 562% compared with that of α 相似文献
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