Monoelemental 2D-materials beyond graphene are attracting great attention. Although monolayer graphene or phosphorene can be prepared from its layered 3D form, graphite or black phosphorus, by exfoliation of a large van der Waals crystal, this route is not suitable for the preparation of 2D-germanene based materials due to the crystal structure and chemical properties of germanium. Unlike graphene or phosphorene, these materials are prepared by chemical exfoliation from bulk Zintl phases-here represented by calcium germanide. We describe the exfoliation and subsequent modification of calcium germanide, which yields layered germanium materials with alkyl or aryl groups. Different organic functional groups covalently attached to layered germanane exhibit a very intense fluorescence in the blue region, which makes them prospective materials for further application in optoelectronic devices. The described procedure for covalently functionalized germananes represents the way for the production of these materials.
Bibliographical noteFunding Information:
M. P. acknowledges the financial support of the Grant Agency of the Czech Republic (EXPRO: 19-26896X). J. S was supported by the Czech Science Foundation (GACR No. 19-17593Y) and also greatly acknowledges the access to the computational resources, which were supplied by the Ministry of Education, Youth and Sports of the Czech Republic under the Projects CESNET (Project No.
LM2015042) and CERIT-Scientific Cloud (Project No. LM2015085) provided within the program Projects of Large Research, Development and Innovations Infrastructures. Z. S. greatly acknowledges the financial support of the Neuron Foundation for science support. This research has also been financially supported by the Ministry of Education, Youth and Sports of the Czech Republic under the Project CEITEC 2020 (LQ1601).
All Science Journal Classification (ASJC) codes
- Materials Science(all)