Abstract
In this study, a novel strategy for manipulating fluorescence emission of organic dyes is reported, which is based on coupling optical properties of colloidal crystals (CCs) with responsive microgels. Firstly, SiO2 microspheres doped with three kinds of organic dyes (Rhodamine B, RhB; fluorescein isothiocyanate, FITC; commercial cationic Fluorescent Yellow, X-10GFF) were prepared and they were used as the cores to synthesize SiO2/PNIPAm complex microgels doped with organic dyes by free radical polymerization. Then 3D self-assembled CCs of the complex microgels were fabricated by centrifugation. The microstructure of the complex microgel was characterized by Fourier transform infrared (FTIR), transmission electron microscopy (TEM), thermogravimetric (TG), dynamic light scattering (DLS), and differential scanning calorimeter (DSC). Moreover, the effect of doping organic dyes and temperature on self-assembly of the microgels were investigated. Manipulation of fluorescence emission for organic dyes by CCs was studied by photoluminescence (PL) and UV-visible spectrophotometer (UV-Vis). The results indicate that, due to the soft and thermosensitive property of PNIPAm shell, continuous adjustment to the photonic bandgap (PBG) of the CCs can be achieved conveniently by varying concentrations of the complex microgels or ambient temperatures, and when PBG of the CCs overlaps with the fluorescence emission peak of the organic dye, fluorescence emission of the organic dye can be manipulated.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Qiancheng Zhang, Qiusheng Song, Ziwen Zhang, Chengyan Zhao, and Haihong Ma. The first draft of the manuscript was written by Qiancheng Zhang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Zhang, Q., Song, Q., Zhang, Z. et al. Preparation, self-assembly of SiO2/PNIPAm complex microgels and their manipulation of fluorescence emission for organic dyes. Colloid Polym Sci 298, 1587–1596 (2020). https://doi.org/10.1007/s00396-020-04746-w
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DOI: https://doi.org/10.1007/s00396-020-04746-w