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Chinese Journal of Materials Research  2015, Vol. 29 Issue (2): 155-160    DOI: 10.11901/1005.3093.2014.316
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Qualitative and Quantitative Analysis of Graphene Oxides by UV Spectroscopy
Qi LAI1,2,**(),Xueping LUO2
1. College of Material Engineering, Panzhihua University, Panzhihua 617000, China
2. Deep-processing Laboratory of Graphite, Panzhihua University, Panzhihua 617000, China
Cite this article: 

Qi LAI,Xueping LUO. Qualitative and Quantitative Analysis of Graphene Oxides by UV Spectroscopy. Chinese Journal of Materials Research, 2015, 29(2): 155-160.

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Abstract  

Graphene oxide (GO) was prepared by chemical oxidation-sonicated crushing method with flake graphite, sulfuric acid and potassium permanganate as raw materials. The prepared GO was characterized by means of spectroscopy SEM, laser granulometer, FT-IR, UV-vis and AFM. The results show that the few-layered GO could be differentiated from the multi-layered graphite oxide in a solution of the mixture of the two by observing the variation of the intensity and the profile of absorption peaks around 230 nm in the UV-vis spectroscopy. Based on this phenomenon, the qualitative and quantitative analysis of graphene oxides in the solution can be realized. Thereby the optimal conditions for the preparation of graphene oxide can be obtained. It is proposed that the appearence of multi absorption peaks nearby 230 nm in the UV spectra of GO may be attributed to the existence of a peculiar structure of discontinues p-p* conjugated system in the graphene oxide.

Key words:  inorganic non-metallic materials      graphene oxide      quantitative analysis      UV-vis spectroscopy      Mechanism     
Received:  01 July 2014     
Fund: *Supported by Key Laborary Foundation of Sichuan Province in Universities No. 2013002.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2014.316     OR     https://www.cjmr.org/EN/Y2015/V29/I2/155

Fig.1  UV-vis spectra of graphene oxide solutions prepared in KMnO4 of different mass ratio
Fig.2  AFM imagines of various graphene oxides (a-d) and their height: (a, e-SK450; b, f-SK350; c, g-SK300; d, h-SK200)
Fig.3  The size of EG with different ultrasonic time
Fig.4  SEM imagines of various graphite oxides (a) SK12, (b) SK50, (c) SK200, (d) SK300
Fig.5  FT-IR spectra of of graphene oxides prepared in KMnO4 of different mass ratio
Fig.6  Standard curve of GO
Measurement values / mgmL-1 Real values / mgmL-1 Error/%
C1 0.023 0.024 4.2
C2 0.086 0.88 2.3
C3 0.079 0.084 6
  
Fig.7  UV-vis spectra of SK350 graphene oxide solutions prepared at different ultrasonic time (a) and different ultrasonic ultrasonic power
Fig.8  Discontinous p bonds
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