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Acta Physico-Chimica Sinca  2016, Vol. 32 Issue (5): 1267-1272    DOI: 10.3866/PKU.WHXB201603014
ARTICLE     
Effect of Preparation Conditions on the Optical Properties of PEI-Functionalized Graphene Quantum Dots
Han WANG,Xiao-Min WANG*()
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Abstract  

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 wordsGraphene quantum dot      Polyethylenimine      Preparation condition      Optical property      Quantum yield     
Received: 07 December 2015      Published: 01 March 2016
MSC2000:  O644  
Fund:  the National Natural Science Foundation of China(51372160);the National Natural Science Foundation of China(51572184)
Corresponding Authors: Xiao-Min WANG     E-mail: wangxiaomin@tyut.edu.cn
Cite this article:

Han WANG,Xiao-Min WANG. Effect of Preparation Conditions on the Optical Properties of PEI-Functionalized Graphene Quantum Dots. Acta Physico-Chimica Sinca, 2016, 32(5): 1267-1272.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201603014     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I5/1267

 
No. t/h T/℃ pH λEX/nm λEM/nm QY/%
1 1 200 12 363 453 3.83
2 10 200 12 363 460 11.39
3 20 200 12 361 458 19.34
4 24 200 12 362 460 21.02
 
 
No. t/h T/℃ pH λEX/nm λEM/nm QY/%
3 20 200 12 361 458 19.34
5 20 180 12 363 460 12.20
6 20 140 12 362 452 6.43
7 20 100 12 362 432 4.56
 
 
No. t/h T/℃ pH λEX/nm λEM/nm QY/%
8 20 200 7 362 453 16.53
9 20 200 9 360 457 17.54
3 20 200 12 361 458 19.34
 
 
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