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- W2041856227 abstract "Irradiation of methane with intense, spatially- and temporally-shaped femtosecond laser pulses forms a spatially confined microplasma that produces carbon nanospheres. The morphology and composition of the nanospheres are characterized by transmission electron microscopy (TEM), ultraviolet (UV) Raman spectroscopy, and infrared spectroscopy (IR). Increasing the pressure of methane from 6.7 to 133.3 kPa results in a decrease of the median diameter of the spheres from ∼500 nm to 85 nm. At pressures of 101.3 kPa and higher, particles with non-spherical morphologies are observed in TEM analysis. The morphology of the nanospheres is determined to be amorphous, containing both sp 2 and sp 3 hybridized carbon atoms, based on the presence of the carbon D and T peaks in the UV Raman spectrum. The red shift of the G peak and a high fluorescence background in the Raman spectrum indicates that the hydrogen content of the spheres is at least 30%. The presence of hydrogen is supported by the IR spectrum, which shows the presence of C–H bonds in the nanosphere product. • Carbon nanospheres can be synthesized via irradiation of gaseous methane. • Sphere size varies with pressure of methane. • Spheres are composed of amorphous carbon." @default.
- W2041856227 created "2016-06-24" @default.
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- W2041856227 date "2015-04-01" @default.
- W2041856227 modified "2023-10-14" @default.
- W2041856227 title "Formation of carbon nanospheres via ultrashort pulse laser irradiation of methane" @default.
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- W2041856227 doi "https://doi.org/10.1016/j.matchemphys.2015.02.017" @default.
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