Citation: WANG Han, WANG Xiao-Min. Effect of Preparation Conditions on the Optical Properties of PEI-Functionalized Graphene Quantum Dots[J]. Acta Physico-Chimica Sinica, ;2016, 32(5): 1267-1272. doi: 10.3866/PKU.WHXB201603014 shu

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

WANG Han ,
WANG Xiao-Min ^,

1.
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China

Corresponding author: WANG Xiao-Min,
Received Date: 7 December 2015
Available Online: 29 February 2016
Fund Project: 国家自然科学基金(51372160,51572184)资助项目 (51372160,51572184)

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.
- Graphene quantum dot,
- Polyethylenimine,
- Preparation condition,
- Optical property,
- Quantum yield
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