Tuning the Band Gap of Stable and Dispersible Graphene Aqueous Solution via Hydrothermal Reduction Method

Zhanglian Hong State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

Xiaoliang Jiao State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

Qiuyue Gao State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

Yuewei Zhang State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

Chan He State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China; Department of Chemistry, Jilin University, Jilin, 130012, China

Jingxia Yang State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

Yi Liu State Key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

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Abstract

A well dispersed graphene aqueous solution was achieved by hydrothermal reduction method, in which graphene oxide (GO) was reduced by employing an effective reagent of hydrazine hydrate (N₂H₄•H₂O). The reduction degree of reduced graphene oxide (RGO) was preciously regulated via different reduction time. The obtained products were confirmed by X-ray diffraction, scanning and transmission electron microscopy, Fourier-transform infrared spectroscopy. The energy band gap of reduced graphene with different reaction time was characterized by ultraviolet-visible spectroscopy. The results showed that hydrothermal reduction method is a simple and efficient approach to synthesizing the dispersed graphene nanosheets aqueous solution, which is stable for several months without obvious precipitates or stratification in basic solvent. The energy band gap of different degree of reduction RGO can be tuned tremendously via controlling the reduction time.

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Acknowledgments

This work was supported partially by Natural Science Foundation of China (No. 51072180), China Postdoctoral Science Foundation (No. 20110491764), the Fundamental Research Funds for the Central Universities (No. 2009QNA4005) and Key Project of Aerospace Science and Technology Innovation Fund (No. CASC200906).

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Tuning the Band Gap of Stable and Dispersible Graphene Aqueous Solution via Hydrothermal Reduction Method

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Tuning the Band Gap of Stable and Dispersible Graphene Aqueous Solution via Hydrothermal Reduction Method

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