Bioinspired perovskite quantum dots microfibers from microfluidics  

仿生包裹钙钛矿量子点纤维的微流控制备

作　　者：Yunru Yu Jiahui Guo Feika Bian Dagan Zhang Yuanjin Zhao 余筠如;郭佳慧;卞非卡;张大淦;赵远锦(Department of Clinical Laboratory,The Affiliated Drum Tower Hospital of Nanjing University Medical School,Nanjing 210008,China;Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou 325000,China;State Key Laboratory of Bioelectronics,School of Biological Science and Medical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]Department of Clinical Laboratory,The Affiliated Drum Tower Hospital of Nanjing University Medical School,Nanjing 210008,China [2]Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou 325000,China [3]State Key Laboratory of Bioelectronics,School of Biological Science and Medical Engineering,Southeast University,Nanjing 210096,China

出　　处：《Science China Materials》2021年第11期2858-2867,共10页中国科学（材料科学（英文版）

基　　金：the National Key Research and Development Program of China(2020YFA0908200);the National Natural Science Foundation of China(52073060 and 61927805);the Natural Science Foundation of Jiangsu(BE2018707);Shenzhen Fundamental Research Program(JCYJ20190813152616459);China Postdoctoral Science Foundation(2020M680652)。

摘　　要：As perovskite quantum dots(PeQDs)are performing their outstanding characteristics,incremental efforts have been devoted to such materials.Here,inspired by the spider spinning process,we present novel PeQDs microfibers with tailorable morphologies and functions from a multi-injection microfluidic approach.The microfibers were generated by introducing PeQDs precursors into each barrel of the inner capillary array and mixing them in the spindle middle channel,where the poly(vinylidene fluoride)(PVDF)dissolved in N,N-dimethyl formamide(DMF)was also injected as their sheath fluid.During this process,the PeQDs were in situ synthesized with the connection of precursor cations and anions in the core fluid;while the PVDF formed solidified microfibers to encapsulate PeQDs with the fast dispersion of DMF into the outer aqueous solution.Thus,the good encapsulation of PeQDs was achieved in PVDF microfibers,which effectively protected them from different hostile environments.Because of the highly tunable spinning processes,the microfibers exhibited controllable diameters and helical geometric structures,and the encapsulated PeQDs could yield adjustable emission peaks.Based on the PeQDs microfibers,we have explored their potential as luminescent materials in barcodes and as flexible photodetectors,which make such microfibers highly versatile for different areas.由于钙钛矿量子点诸多的优良特性,基于其的功能材料已经得到了广泛开发.本文受蜘蛛纺丝工艺启发,通过多相流微流控方式制备了具有可控形态和功能的包裹钙钛矿量子点的超细纤维.将钙钛矿量子点前驱液引入内相毛细管阵列的通道中并将它们在其中混合,而外部通道中通入聚偏二氟乙烯(PVDF)的N,N-二甲基甲酰胺溶液作为壳层纤维的反应溶液.在此过程中,随着外部PVDF纤维的形成,内部钙钛矿量子点前驱液中阴阳离子原位合成,并能够很好地包封在纤维核层中,从而免受外部环境对于结构的破坏.微流控制备纤维的过程高度可控,除了直纤维外,也能制备螺旋纤维,并且还能调节这些纤维的荧光颜色即内部包裹量子点的发射峰.此外,我们探究了这些纤维作为荧光材料在条形码中的应用,以及作为柔性光电探测器的潜在应用,证明了这类纤维在不同领域中具有广泛而灵活的应用潜能.

关 键 词：MICROFLUIDICS PEROVSKITE quantum dot MICROFIBER BARCODE 

分 类 号：TQ342[化学工程—化纤工业] TB34[一般工业技术—材料科学与工程]