Covalent Functionalization of Graphene with Polysaccharides

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• 作者：Qiang Yang ; Xuejun Pan ; Kimmy Clarke ; Kecheng Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：51
• 期：1
• 页码：310-317
• 全文大小：1008K
• 年卷期：v.51,no.1(January 11, 2012)
• ISSN：1520-5045

文摘

Stable aqueous suspension of graphenes was fabricated from chemical reduction of graphene oxide with the assistance of hydroxypropyl cellulose or chitosan covalently grafted on the graphenes. First, pristine graphite was oxidized using a two-step method (H₂SO₄ + HNO₃ followed by KMnO₄). The oxidation-introduced carboxyl groups in graphene oxide were then converted into acyl chloride with thionyl chloride. Subsequently, hydroxypropyl cellulose or chitosan was covalently grafted onto the activated graphene oxide through esterification reactions. Finally, the functionalized graphene oxide was chemically reduced to graphene nanosheets with hydrazine.