Formation of Ultrathin Diamond Films on Metal Substrates via Graphene-Metal Bonding.

Diamond's exceptional properties make it a key material in various technologies, but synthesizing its low-dimensional form, diamane─a diamond film with atomic thickness─remains challenging. Diamane synthesis is complicated by the instability of ultrathin films, which tend to delaminate into multilayer graphene. However, chemically induced phase transitions, where the adsorption of specific atoms stabilizes the film, offer a potential solution.

Resistive Switching in Bigraphene/Diamane Nanostructures Formed on a LaGaSiO Substrate Using Electron Beam Irradiation.

Memristors, resistive switching memory devices, play a crucial role in the energy-efficient implementation of artificial intelligence. This study investigates resistive switching behavior in a lateral 2D composite structure composed of bilayer graphene and 2D diamond (diamane) nanostructures formed using electron beam irradiation. The resulting bigraphene/diamane structure exhibits nonlinear charge carrier transport behavior and a significant increase in resistance.

Formation of Diamane Nanostructures in Bilayer Graphene on Langasite under Irradiation with a Focused Electron Beam.

In the presented paper, we studied bilayer CVD graphene transferred to a langasite substrate and irradiated with a focused electron beam through a layer of polymethyl methacrylate (PMMA). Changes in the Raman spectra and an increase in the electrical resistance of bigraphene after irradiation indicate a local phase transition associated with graphene diamondization. The results are explained in the framework of the theory of a chemically induced phase transition of bilayer graphene to diamane, which can be associated with the release of hydrogen and oxygen atoms from PMMA and langasite due to the "knock-on" effect, respectively, upon irradiation of the structure with an electron beam.

Diamane Oxide. Two-Dimensional Film with Mixed Coverage and a Variety of Electronic Properties.

Here, we investigate stability of the diamane oxide films and show that various compositions can be realized depending on the precursors, temperature, and pressure. We demonstrate that the commonly used oxygen source in the HO form requires pressures of GPa order to fabricate the film, which is in full agreement with the experimental data. We show that different types of functional groups can tailor electronic properties of bilayer diamane.

The Role of Structural Defects in the Growth of Two-Dimensional Diamond from Graphene.

The presented work is devoted to the study of the formation of the thinnest diamond film (diamane). We investigate the initial stages of diamond nucleation in imperfect bilayer graphene exposed by the deposition of H atoms (chemically induced phase transition). We show that defects serve as nucleation centers, their hydrogenation is energy favorable and depends on the defect type.