Bhattacharya Sagarika, Phatake Ravindra Suresh, Nabha Barnea Shiran, Zerby Nicholas, Zhu Jun-Jie, Shikler Rafi, Lemcoff Norberto Gabriel, Jelinek Raz
Department of Chemistry , Ben Gurion University of the Negev , Beer Sheva 84105 , Israel.
Department of Electrical and Computer Engineering , Ben Gurion University of the Negev , Beer Sheva 84105 , Israel.
ACS Nano. 2019 Feb 26;13(2):1433-1442. doi: 10.1021/acsnano.8b07087. Epub 2019 Jan 9.
Multicolor, fluorescent self-healing gels were constructed through reacting carbon dots produced from different aldehyde precursors with branched polyethylenimine. The self-healing gels were formed through Schiff base reaction between the aldehyde units displayed upon the carbon dots' surface and primary amine residues within the polyethylenimine network, generating imine bonds. The dynamic covalent imine bonds between the carbon dots and polymeric matrix endowed the gels with both excellent self-healing properties as well as high mechanical strength. Moreover, the viscoelastic properties of the gels could be intimately modulated by controlling the ratio between the carbon dots and polymer. The distinct fluorescence emissions of the gels, originating from the specific carbon dot constituents, were employed for fabrication of light emitters at different colors, particularly generating white light.
通过使由不同醛前体产生的碳点与支化聚乙烯亚胺反应，构建了多色荧光自修复凝胶。自修复凝胶是通过碳点表面显示的醛基与聚乙烯亚胺网络中的伯胺残基之间的席夫碱反应形成的，生成了亚胺键。碳点与聚合物基质之间的动态共价亚胺键赋予凝胶优异的自修复性能和高机械强度。此外，通过控制碳点与聚合物之间的比例，可以密切调节凝胶的粘弹性。凝胶独特的荧光发射源自特定的碳点成分，用于制造不同颜色的发光体，特别是产生白光。
