Blinking CsPbBr 3 perovskite nanocrystals for the nanoscopic imaging of electrospun nanofibers
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Blinking CsPbBr3 perovskite nanocrystals for the nanoscopic imaging of electrospun nanofibers Tianyu Chen1, Mengna Huang2, Zhongju Ye1, Jianhao Hua1, Shen Lin1 (), Lin Wei2 (), and Lehui Xiao1 () 1
State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China 2 Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, Ministry of Education, Key Laboratory of Phytochemical R&D of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 16 September 2020 / Revised: 13 October 2020 / Accepted: 15 October 2020
ABSTRACT Blinking fluorophore perovskite nanocrystals (NCs) were employed to image the fine structure of the polystyrene (PS) electrospun fibers. The conditions of CsPbBr3 NCs embedded and dispersed into PS were investigated and optimized. The stochastic optical reconstruction microscopy is employed to visualize the fine structure of the resulted CsPbBr3@PS electrospun fibers at subdiffraction limit. The determined resolution in the reconstructed nanoscopic image is around 25.5 nm, which is much narrower than that of conventional fluorescence image. The complex reticulation and multicompartment in bead sub-diffraction-limited structures of CsPbBr3@PS electrospun fibers were successfully mapped with the help of the stochastic blinking properties of CsPbBr3 NCs. This work demonstrated the potential applications of CsPbBr3 perovskite NCs in super-resolution fluorescence imaging to reconstruct the sub-diffraction-limited features of polymeric material.
KEYWORDS CsPbBr3, perovskite nanocrystals, polystyrene, electrospun nanofiber, super-resolution optical imaging
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Introduction
Colloidal semiconductor nanocrystals (NCs), especially perovskite quantum dots have attracted considerable attentions from researchers with tunable sizes, shapes, and compositions in non-polar solvents [1, 2]. Over the past few years, all-inorganic perovskite NCs, especially CsPbX3, where X is one of the three halides (Cl, Br, or I) or their binary mixtures, became promising materials for applications in the next generation of optoelectronic devices due to their higher photoluminescence quantum yields (PLQY), broad ultraviolet–visible (UV–vis) absorption band, flexible tunability of emission wavelength, narrow emission band, long-living free charges, etc. [3–13] However, CsPbBr3 perovskite NCs can be degraded in atmosphere and moisture environments [14–26]. The incorporation of perovskite NCs into a polymeric matrix is a protection strategy that can guarantee the processability, device integration ability as well as preservation of the optical performance [27, 28]. The nano/microfibers with different morphologies can be fabricated together by electrospun technique with various materials (inorganic, organic, or hybrid) [29]. The advantage of colloid
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