Self-wrinkling large band-gap insulating nanosheets for graphene sensor applications

Reduced graphene oxide is being used in the graphene/reduced graphene oxide-based sensor. These two-dimensional (2D) materials, when wrinkled, exhibit different electronic properties compared to flat ones. They have been used for gas detection devices, because their sensitivity and recovery ability are much higher than for flat graphene/reduced graphene oxide (G/rGO). One well-known method of wrinkling 2D G/rGO is the deposition over decorated substrates. Various no-up-scalable fabrication methods of decorated surface production have been used, such as lithography, electrodeposition, nanoimprinting, and sputtering.

Here we introduce self-wrinkling large band gap (7.5 eV) insulating 2D mineral nanosheets [1] that allows for control wrinkling of any type of 2D layer deposited on top of them. As these mineral nanosheets are dispersible in water, the present protocol will enable scale-up just by self-assembly on a substrate, such as deposition on a substrate by dipping, drop casting, spraying, etc.

[1] Large bandgap insulating superior clay nanosheets, Barbara Pacakova, Per Erik Vullum, Alexsandro Kirch, Josef Breu, Caetano Rodrigues Miranda & Jon Otto Fossum, MRS Bulletin 47, December 2022. Impact article. DOI: https://doi.org/10.1557/s43577-022-00349-8 (2022)