Synthesis of diamond-like phase from graphite by ultrafast laser driven dynamical compression

Abstract

Rapid variations of the environmental energy caused by ultrashort laser pulses have induced phase transitions in carbon allotropes, therefore bringing the promise of revealing new carbon phases. Here, by exposing polycrystalline graphite to 25 fs laser pulses at 4 J/cm2 fluence under standard air atmosphere, we demonstrated the synthesis of translucent micrometer-sized structures carrying diamond-like and onion-like carbon phases. Texturized domains of the diamond phase were also identified. Concerning different synthesized carbon forms, pulse superposition and singularities of the thermodynamical process, we pinpoint the synthesis mechanism by the laser-induced subsequent products energetically evolving to attain the diamond-like phase.

Observation of Graphite-Like and Diamond-Like Nanostructures in the Raman Spectra of Natural and Synthesized MoS2 Crystals with Small Carbon Additives

“…This is confirmed by the similarity of the structure of the Raman spectra in Fig. 6a, b and in [85], where the diamond-like phase synthesis under the influence of femtosecond laser pulses (25 fs) on polycrystalline graphite realized, that was confirmed by high resolution electron microscopy and electron diffraction.…”

“…This is confirmed by a significant difference in the frequencies of the Stokes and anti-Stokes components G1.2(k) ~ 7 cm -1 at excitation of both 632.8 nm and 488 nm [38]. In addition, the intense laser radiation leads to significant changes in the structure and properties of matter [12,55,85].…”

Scalable and green formation of graphitic nanolayers produces highly conductive pyrolyzed paper toward sensitive electrochemical sensors

“…4A), PP 10 had majority characteristics of raw paper, bearing few and small structures ordered on the top of the surface. 20 Conversely, these structures had an interplanar distance of 0.34 nm, a signature of graphitic phases, 38 covering ∼7 nm of the PP 10 surface. PP N10 10 had similar features, with the ordered structures presenting ∼10 nm thickness, whereas PP I10 10 showed the most ordered graphitic structures.…”

Observation of Diamond- and Graphite-Like Nanostructures in the Raman Spectra of MoS2–C Nanoheterostructures

“…Это подтверждается и подобием структуры спектров КР на рис. 3, а, б и в работе [47], в которой при воздействии ультракоротких лазерных импульсов (25 фс) на поликристаллический графит реализован синтез алмазоподобной фазы, что подтверждалось данными электронной микроскопии высокого разрешения и дифракции электронов.…”