“…6d, e). These observations provide additional evidence to support the hypothesis of diamondene formation and reinforce our theoretical predictions and previous experimental results 22 , thus indicating that the formation of diamondene is strongly favorable to doubly-stacked graphene compressed in the presence of chemical radicals. It is worth noticing that, even in this case, Raman spectra obtained from the double-layer graphene outside the anvil cell after pressure release (down to atmospheric pressure) indicate that the diamondene structure did not survive to ambient conditions.Fig.…”
Section: Resultssupporting
confidence: 91%
“…With the assumption that the chemical groups are hydroxyl radicals, the compound was named diamondol, and was characterized as a 2D ferromagnetic semiconductor with spin polarized bands 22 . These unique properties, which arise from the periodic array of dangling bonds at the bottom layer, make diamondol a promising candidate for spintronics.…”
Despite the advanced stage of diamond thin-film technology, with applications ranging from superconductivity to biosensing, the realization of a stable and atomically thick two-dimensional diamond material, named here as diamondene, is still forthcoming. Adding to the outstanding properties of its bulk and thin-film counterparts, diamondene is predicted to be a ferromagnetic semiconductor with spin polarized bands. Here, we provide spectroscopic evidence for the formation of diamondene by performing Raman spectroscopy of double-layer graphene under high pressure. The results are explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix. Ab initio calculations and molecular dynamics simulations are employed to clarify the mechanism of diamondene formation, which requires two or more layers of graphene subjected to high pressures in the presence of specific chemical groups such as hydroxyl groups or hydrogens.
“…6d, e). These observations provide additional evidence to support the hypothesis of diamondene formation and reinforce our theoretical predictions and previous experimental results 22 , thus indicating that the formation of diamondene is strongly favorable to doubly-stacked graphene compressed in the presence of chemical radicals. It is worth noticing that, even in this case, Raman spectra obtained from the double-layer graphene outside the anvil cell after pressure release (down to atmospheric pressure) indicate that the diamondene structure did not survive to ambient conditions.Fig.…”
Section: Resultssupporting
confidence: 91%
“…With the assumption that the chemical groups are hydroxyl radicals, the compound was named diamondol, and was characterized as a 2D ferromagnetic semiconductor with spin polarized bands 22 . These unique properties, which arise from the periodic array of dangling bonds at the bottom layer, make diamondol a promising candidate for spintronics.…”
Despite the advanced stage of diamond thin-film technology, with applications ranging from superconductivity to biosensing, the realization of a stable and atomically thick two-dimensional diamond material, named here as diamondene, is still forthcoming. Adding to the outstanding properties of its bulk and thin-film counterparts, diamondene is predicted to be a ferromagnetic semiconductor with spin polarized bands. Here, we provide spectroscopic evidence for the formation of diamondene by performing Raman spectroscopy of double-layer graphene under high pressure. The results are explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix. Ab initio calculations and molecular dynamics simulations are employed to clarify the mechanism of diamondene formation, which requires two or more layers of graphene subjected to high pressures in the presence of specific chemical groups such as hydroxyl groups or hydrogens.
“…Recently, and theoretical [10,17,18] efforts have been directed to study the transformation of multi-layer graphene into a diamond-like structure induced by chemical functionalization of the surface layers. Despite recent successes [13,14], the experimental proof that such atomically-thin diamond-like films exhibit mechanical properties similar to those of diamond remains, unfortunately, missing.…”
mentioning
confidence: 99%
“…The interface between the carbon film and substrate consists of a thin layer of bonds whose transverse mechanical strength is comparable to that of bulk SiC, whereas the surface of the diamond-like film consists of either chemically inert regions exposing for instance the well-known dimer C-C reconstruction (Fig. 4c) or regions with dangling bonds that may be passivated by H or -OH species[13]. This qualitative but important insight allows to model the process of a hard sphere indenting a hard ultra-thin film on a softer substrate.…”
“…Halogenated derivatives may represent a very promising category of Janus graphene structures, with a unique set of physicochemical properties. Computational studies of asymmetrically modified graphene with halogens have shown its great potential including tunable bandgap and magnetic properties . In particular, hydrofluorinated graphene structures with opposing modification with H and F atoms in the graphene lattice can form metallic bilayers and exhibit a tunable bandgap depending on the configuration of hydrogen and halogen, whereas piezoelectric properties were observed for these Janus structures when doped with Li or K .…”
Fluorographene, at wo-dimensional derivativeo f graphene, is an excellent starting materialf or the synthesis of graphene derivatives. In this work, ao ne-step, substratefree method for the asymmetricf unctionalization of fluorographene layers with hydroxyl groups by af acile nucleophilic substitution reactioni sr eported. Such ac hemical modification occurs in ab iphasic aqueous-organic system under mild conditions, leading to Janus graphene nanosheets functionalized by hydroxyl groups on one side and retaining fluorine atoms on the other.T he reported experimental route paves the way for two-dimensional bifacial graphene templates, thus broadening the application potential of graphene materials.
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