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Bianconi, P. A.

doi:10.1126/science.266.5188.1256-a

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…It is believed that the D band around at 1333 cm Ϫ1 is attributed to the presence of sp 3 carbon phase. 14,24,43 Figure 4͑c͒ also shows that the D peak position shifts downwards from 1368 to 1333 cm Ϫ1 for laser fluence rising from 100 to 950 mJ/cm 2 and keeps around 1333 cm Ϫ1 for fluence above 950 mJ/cm 2 . Beeman et al 44 studied the effect on the phonon density of states ͑DOS͒ and Raman spectrum of model structures containing different percentages of diamond-like fourfold-coordinated bonding.…”

Section: Chemical Bonding "Sp 2 /Sp 3 Site… Of the Filmmentioning

confidence: 80%

Raman spectroscopy of phenylcarbyne polymer films under pulsed green laser irradiation

Huang

Sun

2000

Journal of Applied Physics

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Raman scattering as a probe of morphology in conjugated polymer thin filmsThe polycarbyne polymer films were coated on silicon substrates and then irradiated by a pulsed Nd:yttrium-aluminum-garnet laser ͑ϭ532 nm͒ with various fluences in argon gas atmosphere. Significant changes in microstructures and chemical bonding (sp 3 /sp 2 ) during laser treatment were investigated by Raman spectroscopy. At a laser fluence below 50 mJ/cm 2 , the Raman spectrum of the film was similar to that of the original polymer film. In a fluence range from 100 to 650 mJ/cm 2 , the thermal decomposition of the polymer occurred, resulting in upshift of G peak and downshift of the D peak both with narrower peak width. With increasing laser fluence from 650 to 950 mJ/cm 2 , both the G and D peaks downshifted simultaneously due to the thermal decomposition. The simultaneous downshift of both peaks indicated the increased sp 3 /sp 2 ratio in the carbon film converted from the polymer. With increasing laser fluence in this range, the thermal decomposition also induced the narrowing of both peaks. The narrowing of both peaks indicated the increased ordering of sp 3 and sp 2 bonding components in the converted carbon film. The scanning electron microscopy studies provided the further evidence. The carbon films converted from the polymer films may contain the highest sp 3 carbon bonding at laser fluences in the range from 850 to 1000 mJ/cm 2 .

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