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

Maia FC, Samad RE, Bettini J, Freitas RO, Vieira Junior ND, Souza-Neto NM - Sci Rep (2015)

Bottom Line: Here, by exposing polycrystalline graphite to 25 fs laser pulses at 4 J/cm(2) 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.

View Article: PubMed Central - PubMed

Affiliation: Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, São Paulo 13083-970, Brazil.

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/cm(2) 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.

No MeSH data available.


Related in: MedlinePlus

Texturized domains of the diamond-like phase and onions-like carbon coexisting at the laser created particle.(a) SAD of the diamond-like phase from a small area on the region of the laser created structure displayed in (b). The highlighted red spot in the frame (a) represent the selected diffraction peaks for construction the patterned domains shown in (b). Onion-like phases also found at the laser created structure are presented in the frames (c) and (d).
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f3: Texturized domains of the diamond-like phase and onions-like carbon coexisting at the laser created particle.(a) SAD of the diamond-like phase from a small area on the region of the laser created structure displayed in (b). The highlighted red spot in the frame (a) represent the selected diffraction peaks for construction the patterned domains shown in (b). Onion-like phases also found at the laser created structure are presented in the frames (c) and (d).

Mentions: The dark field image shown in Fig. 3b was obtained using an objective aperture to select the diffraction hales corresponding to the two more intense peaks of the diamond-like phase electron diffraction pattern (Fig. 3a). Texturized micrometer domains of the latter phase (Fig. 3b) can be observed with typical sizes around 50 × 25 nm2. In their vicinities, onion-like structures were also encountered (Fig. 3c,d).


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

Maia FC, Samad RE, Bettini J, Freitas RO, Vieira Junior ND, Souza-Neto NM - Sci Rep (2015)

Texturized domains of the diamond-like phase and onions-like carbon coexisting at the laser created particle.(a) SAD of the diamond-like phase from a small area on the region of the laser created structure displayed in (b). The highlighted red spot in the frame (a) represent the selected diffraction peaks for construction the patterned domains shown in (b). Onion-like phases also found at the laser created structure are presented in the frames (c) and (d).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493556&req=5

f3: Texturized domains of the diamond-like phase and onions-like carbon coexisting at the laser created particle.(a) SAD of the diamond-like phase from a small area on the region of the laser created structure displayed in (b). The highlighted red spot in the frame (a) represent the selected diffraction peaks for construction the patterned domains shown in (b). Onion-like phases also found at the laser created structure are presented in the frames (c) and (d).
Mentions: The dark field image shown in Fig. 3b was obtained using an objective aperture to select the diffraction hales corresponding to the two more intense peaks of the diamond-like phase electron diffraction pattern (Fig. 3a). Texturized micrometer domains of the latter phase (Fig. 3b) can be observed with typical sizes around 50 × 25 nm2. In their vicinities, onion-like structures were also encountered (Fig. 3c,d).

Bottom Line: Here, by exposing polycrystalline graphite to 25 fs laser pulses at 4 J/cm(2) 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.

View Article: PubMed Central - PubMed

Affiliation: Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, São Paulo 13083-970, Brazil.

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/cm(2) 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.

No MeSH data available.


Related in: MedlinePlus