Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (5): 1267-1272.doi: 10.3866/PKU.WHXB201603014

• ARTICLE • Previous Articles     Next Articles

Effect of Preparation Conditions on the Optical Properties of PEI-Functionalized Graphene Quantum Dots

Han WANG,Xiao-Min WANG*()   

  • Received:2015-12-07 Published:2016-05-07
  • Contact: Xiao-Min WANG
  • Supported by:
    the National Natural Science Foundation of China(51372160);the National Natural Science Foundation of China(51572184)


Because of their low toxicity and excellent water-solubility, graphene quantum dots have been highly anticipated for use in cellular imaging. However, their limited optical properties are hampering this use. To address this issue, graphene quantum dots surface passivated by branched polyethylenimine (GQDs-BPEI) were proposed in this paper. We discussed optical properties when prepared under different conditions including reaction time, temperature, and pH value. The results indicate that GQDs-BPEI prepared at pH 12, at a temperature of 200 ℃, and with a 20 h reaction in an autoclave can achieve a higher UV absorbency and better PL properties with a high quantum yield.

Key words: Graphene quantum dot, Polyethylenimine, Preparation condition, Optical property, Quantum yield


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