Ren Ying-Yi, Deng Bo-Yi, Liao Zi-Hao, Zhou Zi-Rong, Tung Chen-Ho, Wu Li-Zhu, Wang Feng
Key Laboratory of Materials Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) of Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Adv Mater. 2023 Nov;35(45):e2307971. doi: 10.1002/adma.202307971. Epub 2023 Oct 3.
A novel smart fluorescent polymer polyethyleneimine-grafted pyrene (PGP) is developed by incorporating four stimuli-triggers at molecular level. The triggers are amphiphilicity, supramolecular host-guest sites, pyrene fluorescence indicator, and reversible chelation sites. PGP exhibits smart deformation and shape-dependent fluorescence in response to external stimuli. It can deform into three typical shapes with a characteristic fluorescence color, namely, spherical core-shell micelles of cyan-green fluorescence, standard rectangular nanosheets of yellow fluorescence, and irregular branches of deep-blue fluorescence. A quasi-reversible deformation between the first two shapes can be dynamically manipulated. Moreover, driven by reversible coordination and the resulting intramolecular photoinduced electron transfer, PGP can be used as an aqueous fluorescence ink with erasable and recoverable properties. The fluorescent patterns printed by PGP ink on paper can be rapidly erased and recovered by simple spraying a sequence of Cu and ethylene diamine tetraacetic acid aqueous solutions. This erase/recover transformation can be repeated multiple times on the same paper. The multiple stimulus responsiveness of PGP makes it have potential applications in nanorobots, sensing, information encryption, and anticounterfeiting.
一种新型智能荧光聚合物聚乙烯亚胺接枝芘（PGP）通过在分子水平上引入四种刺激触发因素而开发。这些触发因素是两亲性、超分子主客体位点、芘荧光指示剂和可逆螯合位点。PGP在外部刺激下表现出智能变形和形状依赖性荧光。它可以变形为具有特征荧光颜色的三种典型形状，即蓝绿色荧光的球形核壳胶束、黄色荧光的标准矩形纳米片和深蓝色荧光的不规则分支。前两种形状之间的准可逆变形可以动态控制。此外，在可逆配位和由此产生的分子内光致电子转移的驱动下，PGP可以用作具有可擦除和可恢复特性的水性荧光墨水。PGP墨水在纸上打印的荧光图案可以通过简单地喷洒一系列铜和乙二胺四乙酸水溶液快速擦除和恢复。这种擦除/恢复转换可以在同一张纸上重复多次。PGP的多重刺激响应性使其在纳米机器人、传感、信息加密和防伪方面具有潜在应用。
