Graphene is an important two-dimensional material, and covalent modification is an important method to realize functionalized graphene materials. The development of mild graphene modification methods has received widespread attention. Recently, the Henrik Ottosson team at Uppsala University in Sweden reported a new method for the modification of graphene/graphite by isopropanol by photochemical organic functionalization. The photochemical modification method is carried out in an argon-protected isopropanol using white light as an excitation light source in a mild condition without catalyst and ambient temperature. By simple white light irradiation, the isopropanol fragment can be covalently modified on the surface of graphene to construct functional graphene. At the same time, using the same method, the author modified the graphite and obtained a functionalized graphite material. Characterization experiments by water contact angle measurement confirmed that the functionalized graphite material has better wettability than the coagulated graphite. In addition, the authors found through mechanical testing of atomic force microscopy that functionalized graphene and condensed graphite materials exhibit significantly increased adsorption energy due to surface modification of isopropanol fragments. In order to verify the presence of hydroxyl groups on functionalized graphene and condensate graphite, and the possibility of further modification of hydroxyl groups, the authors used a substitution reaction of thionyl chloride with a hydroxyl group, introduced chloride ions on the surface, and passed X-ray photoelectron spectroscopy. The analysis was confirmed.
Although the method proposed in this paper is not easy to prepare on a large scale, the reaction speed and degree are controllable, there is the possibility of further functionalization, and no large equipment is needed, and even sunlight may be used instead of the light source, and the conditions are mild, the method is simple, and the cost is low. Therefore, this method has potential good prospects in the patterning and chip application of graphene. The paper was published in Small Methods (DOI: 10.1002/smtd.201700214).
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