高效发光钙钛矿量子点/纳米纤维素复合增强膜的制备与性能研究

Preparation and Properties of High-efficiency Luminescent Perovskite Quantum Dots/Nanocellulose Composite Reinforced Films

中文关键词:  钙钛矿量子点  纳米纤维素  光致发光量子产率  荧光强度

Key Words:perovskite quantum dots  nanocellulose  photoluminescence quantum yield  fluorescence intensity

中文摘要:

      本研究采用热注入法合成策略，以5-溴戊酸（BVA）取代油酸（OA）作为表面配体，在油胺（OLA）的协同作用下，合成得到尺寸均一、形貌可控、高荧光量子产率（PLQY=58.1%）的无机CsPbBr₃钙钛矿量子点（BVA-CsPbBr₃ PQDs）。在此基础上，结合纤维素纳米纤维（CNF）优异的机械性能及多孔结构，制备得到PQDs@CNF复合增强膜，BVA-CsPbBr₃ PQDs均匀分散并被牢固锚定在CNF纤维网络中，有效避免了量子点的团聚，同时增强了PQDs@CNF复合增强膜的机械强度。结果表明，PQDs@CNF复合增强膜具有优异的发光特性和力学性能，不仅保留了BVA-CsPbBr₃ PQDs原有的高光致发光强度，还因结合了CNF，具备良好的环境适应性和稳定性。

Abstract:

      In this study， the inorganic CsPbBr₃ quantum dots （BVA-CsPbBr₃ PQDs） with uniform size， controllable morphology， and high fluorescence quantum yield （PLQY=58.1%） were synthesized by adopting the thermal injection method， and the 5-bromovaleric acid （BVA） was used to replace the oleic acid （OA） as the surface ligand in the synergic action with oleylamine （OLA）. Based on that， the excellent mechanical properties and abundant porous structure of cellulose nanofibers （CNF） were combined to prepare the PQDs@CNF composite reinforced films， which enabled the BVA-CsPbBr₃ PQDs to be uniformly dispersed and firmly anchored in the CNF fiber network， effectively avoiding the agglomeration of the PQDs and enhancing the mechanical strength of the PQDs@CNF composite reinforced films. The results showed that the PQDs@CNF composite reinforced films had excellent luminescence and mechanical properties， which not only retained the original high photoluminescence intensity of BVA-CsPbBr₃ PQDs， but also had the environmental adaptability and stability due to the combination with CNF.