To bring graphene closer to its real-world applications, finding a green, low-cost, environment-friendly and less toxic solvent for production of high-quality graphene is highly demanded. However, water, the most widely used green solvent, is generally considered to be a poor solvent for hydrophobic graphene. In this study, we exfoliate graphene nanosheets directly in basic water without surfactants, polymers or organic solvents. The addition of a small amount of ammonia solution achieves the exfoliation of few-layer graphene nanosheets from pristine graphite. Diverse characterization methods are employed to investigate the morphology and quality of as-prepared graphene sheets. The release of gaseous ammonia plays the key role in exfoliation of graphene. The concentration of stable graphene dispersions can reach 0.058 mg/mL.

影响因子
8.128
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作者

Han Ma,Zhigang Shen,Min Yi,Shuang Ben,Shuaishuai Liang,Lei Liu,Yixiang Zhang,Xiaojing Zhang,Shulin Ma.

期刊

Journal of Colloid and Interface Science,503,68-75(2017)

年份