title: Study on the fluorescence characteristics of carbon dots.
abstract: 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.
authors.affiliation: Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Beibei, Chongqing 400715, PR China.
authors.forename: Xiao-Jiao
authors.initials: XJ
authors.lastname: Mao
authors.forename: Hu-Zhi
authors.initials: HZ
authors.lastname: Zheng
authors.forename: Yi-Juan
authors.initials: YJ
authors.lastname: Long
authors.forename: Juan
authors.initials: J
authors.lastname: Du
authors.forename: Jian-Yu
authors.initials: JY
authors.lastname: Hao
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: Wang
authors.forename: Dong-Bo
authors.initials: DB
authors.lastname: Zhou
mesh_terms: D002244:Carbon / Q000737:chemistry*; D005453:Fluorescence; D008670:Metals / Q000737:chemistry; D053758:Nanoparticles; D011092:Polyethylene Glycols / Q000737:chemistry; D045663:Quantum Dots
chemical_list: D008670:Metals; D011092:Polyethylene Glycols; D002244:Carbon