静电纺丝制备高疏水性的CsPbBr_(3)纳米晶聚甲基丙烯酸甲酯复合纤维薄膜  

Water-Resistant CsPbBr_(3) Nanocrystal-Polymethylmethacrylate Composite Fibrous Membranes Prepared by Electrostatic Spinning

作　　者：王琪 李可 吴益华[1,2] 朱志刚[1,3] 施惟恒 WANG Qi;LI Ke;WU Yihua;ZHU Zhigang;SHIH Weiheng(School of Energy and Materials,Shanghai Polytechnic University,Shanghai 201209,China;Research Center of Resource Recycling Science and Engineering,Shanghai Polytechnic University,Shanghai 201209,China;School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Materials Science and Engineering,Drexel University,Philadelphia 19104,PA,USA)

机构地区：[1]上海第二工业大学能源与材料学院,上海201209 [2]上海第二工业大学资源循环科学与工程中心,上海201209 [3]上海理工大学医疗器械与食品学院,上海200093 [4]德雷克塞尔大学材料科学与工程系,宾州费城19104

出　　处：《材料导报》2022年第16期246-250,共5页Materials Reports

基　　金：上海第二工业大学研究生项目(EGD19YJ0071)。

摘　　要：目前,全无机钙钛矿卤化铅铯CsPbX_(3)(X=Cl,Br,I)纳米晶因具有量子产率高、荧光波长可调、半峰宽窄等优异的光学性能,成为探索光电子器件的优秀候选材料。虽然此材料的优点突出,在发光二极管(LEDs)、光电探测器、太阳能电池和下一代显示设备等方面应用广泛,但由于其稳定性差,实际应用受到限制。本工作采用静电纺丝技术,对同时溶解了纳米晶前驱体和聚甲基丙烯酸甲酯(PMMA)的N,N-二甲基甲酰胺(DMF)溶液进行静电纺丝,通过一步法在PMMA薄膜中原位生成溴化铅铯(CsPbBr_(3))纳米晶。结果表明,CsPbBr_(3)纳米晶被很好地包裹在聚合物纤维中,且分散非常均匀,在紫外灯照射下可以发出清晰且均匀的绿色荧光。纤维薄膜在水中放置超过四个月后,仍然能保持初始发光强度的70%,具有非常好的水稳定性。与传统的合成钙钛矿后混入纤维前驱体生成风干膜(ADF)的两步法相比,一步法制备钙钛矿纳米晶复合薄膜不仅为制备高稳定性钙钛矿提供了新的方法,而且使用的原材料少,工艺更简单。All-inorganic perovskite cesium-based lead halide CsPbX_(3)(X=Cl,Br,and I)nanocrystals have excellent optical properties such as high quantum yield,adjustable emission wavelength and narrow full width at half maximum(FWHM).Consequently,all-inorganic perovskite has become an excellent candidate for optoelectronic devices,such as light-emitting diodes(LEDs),photodetectors,solar cells and next-generation display devices.Although there are many advantages of this material,the poor stability in ambient condition greatly limits its practical applications.In this work,the precursors of nanocrystalline CsPbBr_(3) and polymethyl methacrylate(PMMA)were mixed together in N,N-dimethylformamide(DMF)and subsequently electrostatically spun to generate CsPbBr_(3)@PMMA composite eletrospun fibrous membrane(EFM)in situ.It is shown that the CsPbBr_(3) nanocrystals are well wrapped within the polymer fibers and are uniformly distributed.The emitted fluorescence light under excitation by ultraviolet light is uniform as well.The composite EFM can maintain 70%of the original photoluminescence intensity after being placed in deionized water for more than four months,showing excellent water stability.Compared with the traditional two-step method of using synthesized perovskite and then mixing in fiber precursor to generate air dried film(ADF),this one-step method for preparing the perovskite nanocrystal composite film not only provides a new method for preparing highly stable perovskite nanocrystalline polymer composite films but also uses fewer raw materials and the process is simple.

关 键 词：全无机钙钛矿 静电纺丝 原位生长 纤维薄膜 溴化铅铯 

分 类 号：TB333[一般工业技术—材料科学与工程]