Surface functionalization modification of graphene and graphene oxide

Summary: Graphene and graphene oxide due to special electronics, optics, mechanics performance has become the current hot spots of scientific research. Emphasis in recent years is reviewed in this paper the surface of graphene and graphene oxide functional modification research progress. Firstly introduces the basic structure of graphene and graphene oxide and the nature. And then the surface functionalization is divided into non covalent bonds combined modification, covalent binding and element doping modification. Non covalent functionalization of modification can be divided into four categories: PI bond interactions, hydrogen bonding, ionic bond and electrostatic interactions. The combination of covalent bond functional modification is divided into four categories: carbon skeleton functionalization, hydroxy functional, carboxyl functionality Doping modification and epoxy functional. Elements are classified into different elements such as N, P, B doped functional. Graphene and graphene oxide substrate were summarized and the modified molecular interaction and reaction types, as well as the properties and the application of the modified products. Finally, the graphene and graphene oxide on the surface functionalization modification discussed and predicted its prospect.

The introduction

In 2010, the Nobel Prize for physics to Geim and Novoselov for their pioneering research in terms of graphene materials. Graphene is currently found in nature, the thinnest material belongs to the two dimensional structure, single layer thickness of only 0.3354 nm. It can form in curl zero dimension, fullerenes, one dimensional carbon nanotubes can be parallel inclination constitute a three-dimensional structure of graphite. Graphene has excellent mechanical properties, thermal properties and electrical properties, electrochemical properties, large specific surface area and high transparency and other special physical and chemical properties, make its in new composite materials, photoelectric materials, biological sensors, catalyst, drug transmission has great potential value in many fields.

The method of preparation of graphene and graphene oxide mainly include: mechanical stripping method, the thermal expansion stripping method, electrochemical method, gas phase deposition method, crystal epitaxial growth method and oxidation reduction method and other methods. Graphene oxide has a flat structure similar to that of graphene, contains a lot of the surface of the active group, such as hydroxyl (OH), epoxy group [- C (O) C -], carbonyl (C = O), carboxyl (-cooh) group, ester (COO -) and so on. Because of graphene itself insoluble and van der Waals force between layers and PI PI accumulation effect, usually graphene in water and organic solvents zhongyi irreversible aggregation and precipitation.

Constituent of graphene material itself has certain limitations, such as electrochemical activity is weak and prone to reunite, not easy to processing molding, greatly limits the application of graphene. Therefore, the functionalization of graphene and graphene oxide modified will be crucial to expand its application. Research on the functionalization of graphene have extensive research, and has published a series of excellent reviews, both focus on the functional resorcinarene methods (physical modification, chemical modification), there are also focusing on the functional properties and the application of the product.

Of graphene or functionalization of graphene oxide are based on its intrinsic structure further modification. This article from the intrinsic structure of graphene and graphene (chemical bond, functional group), the classification introduced functional modification methods. First, this paper introduces the basic structure of graphene and graphene oxide and the nature, based on the functional modification of surface structure can be divided into three conditions: the role of noncovalent bond functional modification, the combination of covalent functionalization modification and element doping modification. Then, the typical type of reaction process and the reaction conditions and its research method has made the detailed classification and summary of the system. Finally, on the graphene and graphene oxide The prospect of surface functionalization was discussed.

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