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Large bandgap insulating superior clay nanosheets

2022; Springer Nature; Volume: 47; Issue: 12 Linguagem: Inglês

10.1557/s43577-022-00349-8

1938-1425

Barbara Pacáková, Per Erik Vullum, Alexsandro Kirch, Josef Breu, Caetano R. Miranda, Jon Otto Fossum,

Multiferroics and related materials

Abstract One can find conductive, semiconducting, and insulating single nanosheets with unique electronic properties that are tied to their two-dimensional (2D) structure. Here, we report on wide-bandgap 2D insulator nanosheets obtained by delamination of a synthetic 2D fluorohectorite clay mineral showing one of the largest bandgap insulators in the world. The bandgap was determined experimentally to be up to 7.1–8.2 eV measured by electron energy-loss spectroscopy in a high-resolution transmission electron microscope. The experimental data were supported by DFT calculations giving a bandgap of 5.5 eV. The single fluorohectorite clay crystalline nanosheets are 0.95-nm, and they can be synthetized with high-aspect ratios and lateral dimensions up to dozens of microns. These properties render these nanosheets promising candidates for practical applications in manually assembled or self-assembled electronic heterostructures, potentially serving as insulating nanosheets in graphene or various (semi)conductive 2D material-based devices. Impact statement Properties of the synthetic fluorohectorite clay presented in this article render these 0.95-nm-thin nanosheets promising candidates for practical applications in manually assembled or self-assembled electronic heterostructures, potentially serving as insulating nanosheets in graphene or various (semi)conductive 2D material-based devices. The information provided in this work can be essential for the growing community focused on the study of 2D materials and their wide range of applications. Graphical abstract