Study on the fluorescence characteristics of carbon dots.
Herein, we prepared water-soluble fluorescent carbon dots with diameter about 1.5 nm from cheap commercial lampblack. These fluorescent carbon nanoparticles are stable toward photobleaching and stable in water for more than half a year without fluorescence decrease. In order to improve its fluorescence properties, we passivated these nanoparticles with bisamino-terminated polyethylene glycol (PEG(1500 N)). Therefore, both fluorescence quantum yield and lifetime increased after this progress. In addition, the passivated carbon dots were more inert to solvent than the bare one and showed different responses to pH change.
Mao
Xiao-Jiao
XJ
Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Beibei, Chongqing 400715, PR China.
Zheng
Hu-Zhi
HZ
Long
Yi-Juan
YJ
Du
Juan
J
Hao
Jian-Yu
JY
Wang
Ling-Ling
LL
Zhou
Dong-Bo
DB
D002244:Carbon / Q000737:chemistry*; D005453:Fluorescence; D008670:Metals / Q000737:chemistry; D053758:Nanoparticles; D011092:Polyethylene Glycols / Q000737:chemistry; D045663:Quantum Dots
D008670:Metals; D011092:Polyethylene Glycols; D002244:Carbon