Unveiling size-fluorescence correlation of organic nanoparticles and its use in nanoparticle size determination  

作　　者：Wu-Jie Guo Shixiang Ma Hui Wang Lu Qiao Lei Chen Chenyu Hong Bin Liu Xiaoyan Zheng Hui-Qing Peng 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing Advanced Innovation Center for Soft Matter Science and Engineering,Beijing University of Chemical Technology,Beijing,China [2]Key Laboratory of Cluster Science of Ministry of Education,Beijing Key Laboratory of Photoelectronic/Electro-photonic Conversion Materials,Key Laboratory of Medicinal Molecule Science and Pharmaceutics Engineering of Ministry of Industry and Information Technology,School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing,China

出　　处：《Aggregate》2024年第1期331-336,共6页聚集体（英文）

基　　金：National Key R&D Program of China,Grant/Award Number:2022YFA1505900;National Natural Science Foundation of China,Grant/Award Numbers:22105016,22173006;Open Fund of Guangdong Provincial Key Laboratory of Luminescence,South China University of Technology,Grant/Award Number:2019B030301003;Beijing Natural Science Foundation,Grant/Award Number:2222027。

摘　　要：Quantitatively establishing the correlation between nanoparticle size and fluorescence is essential for understanding the behavior and functionality of fluorescent nanoparticles(FNPs).However,such exploration focusing on organic FNPs has not been achieved to date.Herein,we employ the use of supramolecular polymeric FNPs prepared from tetraphenylethylene-based bis-ureidopyrimidinone monomers(bis-UPys)to relate the size to the fluorescence of organic nanoparticles.At an equal concentration of bis-UPys,a logarithmic relationship between them is built with a correlation coefficient higher than 0.96.Theoretical calculations indicate that variations in fluorescence intensity among FNPs of different sizes are attributed to the distinct molecular packing environments at the surface and within the interior of the nanoparticles.This leads to different nonradiative decay rates of the embedded and exposed bis-UPys and thereby changes the overall fluorescence quantum yield of nanoparticles due to their different specific surface areas.The established fluorescence intensity-size correlation possesses fine universality and reliability,and it is successfully utilized to estimate the sizes of other nanoparticles,including those in highly diluted dispersions of FNPs.This work paves a new way for the simple and real-time determination of nanoparticle sizes and offers an attractive paradigm to optimize nanoparticle functionalities by the size effect.

关 键 词：aggregation-induced emission fluorescence detection fluorescent nanoparticle nanoparticle size supramolecular polymer 

分 类 号：TB383[一般工业技术—材料科学与工程]