选择性还原氧化石墨烯

文章编号:　1007⁃8827(2014)01⁃0061⁃06

选择性还原氧化石墨烯

徐　超1,　员汝胜1,　汪　信2

(1.福州大学光催化研究所福建省重点实验室⁃国家重点实验室培育基地,福建福州350002;

2.南京理工大学教育部软化学与功能材料重点实验室,江苏南京210094)

摘　要:　还原氧化石墨烯已被广泛用于制备基于石墨烯的材料㊂目前,还原处理方法均是尽可能地将氧化石墨烯中的功能团去除,恢复石墨烯的电子结构㊂由于氧化石墨烯中氧基功能团(如羟基㊁羧基及环氧基)不同的反应活性,氧化石墨烯是可能通过分步的方法进行还原㊂利用醇溶剂如乙醇㊁乙二醇㊁丙三醇还原氧化石墨烯,并采用不同分析手段对样品进行表征㊂结果发现,在一定条件下这些醇可选择性地还原氧化石墨烯㊂经这些醇的处理后,氧化石墨烯中环氧功能团被大部分去除,而其他的功能团如羟基和羧基仍被保留㊂这种选择性去除氧化石墨烯表面功能团的方法可利于有效地控制氧化石墨烯的还原程度㊁获得具有特定功能团的石墨烯衍生物,从而扩大这类材料的使用范围㊂

关键词:　氧化石墨烯;氧化功能团;醇;选择性还原

基金项目:国家自然科学基金(21201036,21077023);福建省自然科学基金(2010J01035,2012J01039).

作者简介:徐　超,博士,讲师.E⁃mail:cxu@

Selective reduction of graphene oxide

XU Chao1,　YUAN Ru⁃sheng1,　WANG Xin2

(1.Research Institute of Photocatalysis,Fujian Provincial Key Laboratory

of Photocatalysis⁃⁃State Key Laboratory Breeding Base,Fuzhou University,Fuzhou350002,China;

2.Key Laboratory for Soft Chemistry and Functional

Materials of Ministry Education,Nanjing University of Science and Technology,Nanjing210094,China)

Abstract:　The reduction of graphene oxide has been widely used to control the properties of graphene⁃based materials.Traditional methods thoroughly remove oxygenated functional groups in graphene oxides.We show that ethanol,ethylene glycol and glycerol can se⁃lectively reduce epoxy groups in graphene oxide while hydroxyl and carboxyl groups remain unchanged.Hydrazine hydrate can reduce ox⁃ygen functional groups except carboxyl groups.These selective removals can be used to control the reduction degree of graphene oxides and their properties.The electrical conductivity of the reduced graphene oxides with different types of oxygen functional groups varied sig⁃nificantly and increased with the degree of reduction.

Keywords:　Graphene oxide;Oxygenated functional groups;Alcohols;Selective reduction

CLC number:　TQ127.1+1Document code:　A

Received date:2013⁃07⁃10;　Revised date:2013⁃12⁃22

Corresponding author:XU Chao,Ph.D,Lecturer.E⁃mail:cxu@

Foundation items:National Natural Science Foundation of China(21201036,21077023);Natural Science Foundation of Fujian Province (2010J01035,2012J01039).

English edition available online ScienceDirect(http:∕∕∕science∕journal∕18725805).

DOI:10.1016/S1872⁃5805(14)60126⁃8

1　Introduction

Graphene oxide(GO),utilized as precursor for a large⁃scale production of graphene⁃based materials,has attracted a great deal of attention in recent years[1⁃5]. GO sheets are electrically insulating,owing to their oxygenated functional groups(hydroxyl,carboxyl and epoxy groups)on surface,which usually need further treatments to restore the electrical conductivity for spe⁃cific applications[6].A lot of methods,such as chemi⁃cal reduction[7⁃9],laser irradiation[10,11],microwave ir⁃radiation[12,13],photocatalysis[14,15],solvothermal re⁃duction[16,17],have been explored to remove these atta⁃ched groups thoroughly and to recover graphene net⁃works of sp2bonds.

Actually,researchers recently have found that the reduction degree of graphene oxide or oxidation degree of graphene has certain influences on their properties,such as electrical conductivity,catalysis activity and semi⁃conductive band positions[18⁃20]. Among these research work,the reduction degree of

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