Journal of Materials Science

, Volume 50, Issue 16, pp 5411–5418 | Cite as

Hydrothermal synthesis of ionic liquid-capped carbon quantum dots with high thermal stability and anion responsiveness

  • Baogang Wang
  • Weiwei Tang
  • Hongsheng Lu
  • Zhiyu Huang
Original Paper


Ionic liquid (1-aminopropyl-3-methyl-imidazolium bromide, [APMIm][Br])-capped carbon quantum dots (CQDs) were obtained by a hydrothermal method. Characterization results demonstrated that the CQDs possessed an average particle size of 2.9 nm, poor crystallinity, and [APMIm][Br] shell linked by amide bond. In addition, the CQD surfaces were also decorated by some oxygen-containing groups. These surface groups made CQDs have an excellent dispersibility in water. The optical property measurements indicated that CQDs aqueous suspension emitted strongest blue fluorescence at 443 nm under 375 nm excitation with a fluorescence quantum yield of 20.3 %. The luminescence property of CQDs in water exhibited excitation wavelength-, concentration-, and pH-dependences, high photostability, and outstanding salt resistance. More importantly, the [APMIm][Br] shell endowed CQDs with a high thermal stability (>300 °C) and an interesting anion responsiveness, i.e., CQDs spontaneously transferred from aqueous phase to ethyl acetate phase once the anion of N(CF3SO2) 2 was introduced. These particular properties should provide more possibilities for the utility of CQDs in various fields.


Ionic Liquid High Thermal Stability Fluorescence Quantum Yield Quinine Sulfate Citric Acid Monohydrate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was financially supported by the Young Scholars Development Fund of Southwest Petroleum University (No. 201499010109) and National Natural Science Foundation of China (No. 51302273, No. 21403173).

Supplementary material

10853_2015_9085_MOESM1_ESM.docx (249 kb)
Supplementary material 1 (DOCX 248 kb)


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.College of Chemistry and Chemical EngineeringSouthwest Petroleum UniversityChengduPeople’s Republic of China
  2. 2.Engineering Research Center of Oilfield Chemistry, Ministry of EducationChengduPeople’s Republic of China
  3. 3.Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, College of Chemistry and Chemical EngineeringSouthwest Petroleum UniversityChengduPeople’s Republic of China

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