Preparation of multicolor carbon dots with thermally turn-on fluorescence for multidimensional information encryption  

作　　者：Chan Wang Jianfeng Huang Yimin He Guoxia Ran Qijun Song 

机构地区：[1]Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,International Joint Research Center for Photoresponsive Molecules and Materials,School of Chemical&Material Engineering,Jiangnan University,Wuxi 214122,China [2]Department of Radiation Oncology,Affiliated Hospital of Jiangnan University,Wuxi 214122,China

出　　处：《Chinese Chemical Letters》2024年第1期343-347,共5页中国化学快报（英文版）

基　　金：the Natural National Science Foundation of China (No. 51973083);the Fundamental Research Funds for the Central Universities (No. JUSRP22027);clinical research and translational medicine program of affiliated hospital of Jiangnan University (No. LCYJ202239).

摘　　要：Carbon dots(CDs)with superior fluorescence properties have attracted a growing number of research interests in anti-counterfeiting.However,the preparation of CDs with thermally turn-on fluorescence and full-color-emitting in visible spectrum is still a big challenge due to the complicated reaction mechanism in the formation of CDs.Here,a simple precursor-oriented strategy for the preparation of multicolor CDs with heat-stimuli turn-on fluorescence is reported.Comprehensive experimental characterizations and theoretical calculations revealed that the emission wavelength of CDs can be readily tuned from 460 nm to 654 nm with selected precursors,which was ascribed to the extent of conjugated sp2-domains(core states)and the amount of oxygen-and nitrogen-containing groups bound to sp2-domains(surface states).After simply mixing two or three kinds of CDs,a full-color range of fluorescence emission was realized,and the CDs-based fluorescence inks were successfully fabricated.Particularly,all the printed patterns from the inkjet exhibited a thermal-induced enhancement in fluorescence.On this basis,combining CDs with heating-induced“turn-off”fluorescence materials can lead to multidimensional and multistage encryption.These results demonstrate that the thermochromic and photochromic CDs with much more enhanced security exhibit promising application in data storage and encryption.

关 键 词：Carbon dots Precursor-oriented structure Full-color fluorescence Turn-on thermosensitivity Advanced anti-counterfeiting 

分 类 号：TP309[自动化与计算机技术—计算机系统结构] TQ127.11[自动化与计算机技术—计算机科学与技术]