Koutsioukis Apostolos, Spyrou Konstantinos, Chalmpes Nikolaos, Gournis Dimitrios, Georgakilas Vasilios
Department of Materials Science, University of Patras, 26504 Rio, Greece.
Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece.
Nanomaterials (Basel). 2022 Jan 28;12(3):447. doi: 10.3390/nano12030447.
The dual use of potassium superoxide (KO) to unzip multiwalled carbon nanotubes (MWCNTs) and cut graphene under hydrothermal conditions is described in this work. The KO-assisted hydrothermal treatment was proven to be a high-yield method for forming graphene nanoribbons and dots or sub-micro-sized graphene nanosheets. Starting with functionalized MWCNTs, the method produces water-dispersible graphene nanoribbons with characteristic photoluminescence depending on their width. Using pristine graphene, the hydrothermal treatment with KO produces nanosized graphene sheets and graphene quantum dots with diameters of less than 10 nm. The latter showed a bright white photoluminescence. The effective hydrothermal unzipping of MWNTs and the cutting of large graphene nanosheets is a valuable top-down approach for the preparation of graphene nanoribbons and small nanographenes. Both products with limited dimensions have interesting applications in nanoelectronics and bionanotechnology.
本文描述了在水热条件下利用超氧化钾（KO）同时实现多壁碳纳米管（MWCNT）的开管以及石墨烯切割的过程。实验证明，KO辅助水热处理是一种高产率制备石墨烯纳米带、量子点或亚微米尺寸石墨烯纳米片的方法。该方法以功能化的MWCNT为原料，能够制备出具有特征光致发光特性（取决于其宽度）且可在水中分散的石墨烯纳米带。使用原始石墨烯，经KO水热处理可得到直径小于10 nm的纳米尺寸石墨烯片和石墨烯量子点。后者呈现出明亮的白色光致发光。MWNT的有效水热开管以及大尺寸石墨烯纳米片的切割是一种制备石墨烯纳米带和小尺寸纳米石墨烯的重要的自顶向下方法。这两种尺寸受限的产物在纳米电子学和生物纳米技术领域均具有有趣的应用。
