Thermal decomposition of polymeric C60

Wang, Ying; Holden, J. M.; Bi, Xiang‐Xin; Eklund, P. C.

doi:10.1016/0009-2614(93)e1409-a

Cited by 169 publications

(122 citation statements)

References 9 publications

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“…Similar Raman measurements were also performed at elevated temperatures for the pristine C 60 . The photo-oligomers in pristine C 60 show somewhat higher stability: the rapid decrease of the photopolymer content begins near ∼ 400 K and becomes half at 410 K. These data are very close to those obtained in a previous Raman study of the thermal decomposition of photopolymerized C 60 thin films [22].…”

Section: Figsupporting

confidence: 79%

Comparative Raman study of photo-oligomer stability in the donor-acceptor fullerene complex {Pt(dbdtc)2}•C60 and pristine C60

Meletov¹,

Arvanitidis²,

Christofilos³

et al. 2016

Nanosystems: Phys. Chem. Math.

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The photopolymerization process and the stability of the C 60 photo-oligomers at elevated temperature in the molecular donor-acceptor fullerene complex {Pt(dbdtc) 2 }·C 60 (C 60 complex with platinum dibenzyldithiocarbamate) and pristine fullerite C 60 are studied by Raman spectroscopy. Fast polymerization, manifested by the appearance of additional peaks in the frequency region of the A g (2) pentagon-pinch (PP) mode of the C 60 molecule, was observed upon sample illumination at 514.5 and 532 nm, even at low laser power density as well as at 785 nm at higher power density. The frequencies of the new peaks are in accordance with the empirical dependence of the PP-mode frequency on the number of the sp 3 -like coordinated carbon atoms per molecular cage. The temperature dependence of the polymer content under constant laser power density reveals the decomposition of the photo-oligomers to monomers at ∼ 350 K in the fullerene complex {Pt(dbdtc) 2 }·C 60 and at ∼ 410 K in the case of the pristine C 60 . These values are considerably smaller than the decomposition temperature of 525 -565 K for the crystalline polymers of C 60 .

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Section: Figsupporting

confidence: 79%

Comparative Raman study of photo-oligomer stability in the donor-acceptor fullerene complex {Pt(dbdtc)2}•C60 and pristine C60

Meletov¹,

Arvanitidis²,

Christofilos³

et al. 2016

Nanosystems: Phys. Chem. Math.

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“…In particular, these characteristics were suggested by the analysis of Raman spectral peaks at 1459 and 118 cm Ϫ1 that are related to the photopolymerized phase. 16 The intensities of these two peaks drastically decreased with increasing temperature around 400 K. The behavior of the Raman peaks is quite similar to the temperature dependence of the hardening, ⌬H v , as shown in Fig. 3.…”

Section: B Origin Of Photo-illumination Hardeningsupporting

confidence: 72%

“…[15][16][17] According to the reports, the covalent bonds between C 60 molecules in the polymerized films can be broken thermally above 400 K and they return to the intrinsic, toluene-soluble states. In particular, these characteristics were suggested by the analysis of Raman spectral peaks at 1459 and 118 cm Ϫ1 that are related to the photopolymerized phase.…”

Section: B Origin Of Photo-illumination Hardeningmentioning

confidence: 99%

Photo-illumination hardening of C60 crystals

Tachibana

Sakuma

Kojima

1997

Journal of Applied Physics

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The effect of light on the hardness of C 60 crystals was investigated. The hardness increased after the crystals were illuminated with white light. Such a photo-illumination hardening was effective in a temperature range of 298-380 K. The photopolymerized C 60 molecules near the crystal surface were responsible for the hardening. The anomalous temperature dependence of the hardness at temperatures higher than 300 K, which we previously have observed, is explained as due to the photo-illumination hardening.

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“…However, the Raman shifts were observed to increase along (1) 710 H g (3) 765 H g (4) 1417 H g (7) 1460 A g (2) 1568 H g (8) Raman shift (cm −1 ) the red arrows for the high energy doses in Figures 6(c), 6(d), 6(e), and 6(f). These phenomena are supposed to be explained by the temperature rise of the C 60 NWs exposed to the laser beams, since it is known that the photopolymerized C 60 molecules decompose into their primary monomers and dimers by heating at temperatures higher than about 100 • C [13].…”

Section: Methodsmentioning

confidence: 99%

Raman Laser Polymerization ofC60Nanowhiskers

Kato

Miyazawa

2012

Journal of Nanotechnology

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Photopolymerization of C 60 nanowhiskers (C 60 NWs) was investigated by using a Raman spectrometer in air at room temperature, since the polymerized C 60 NWs are expected to exhibit a high mechanical strength and a thermal stability. Short C 60 NWs with a mean length of 4.4 µm were synthesized by LLIP method (liquid-liquid interfacial precipitation method). The A g (2) peak of C 60 NWs shifted to the lower wavenumbers with increasing the laser beam energy dose, and an energy dose more than about 1520 J/mm 2 was found necessary to obtain the photopolymerized C 60 NWs. However, excessive energy doses at high-power densities increased the sample temperature and lead to the thermal decomposition of polymerized C 60 molecules.

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Thermal decomposition of polymeric C60

Cited by 169 publications

References 9 publications

Comparative Raman study of photo-oligomer stability in the donor-acceptor fullerene complex {Pt(dbdtc)2}•C60 and pristine C60

Comparative Raman study of photo-oligomer stability in the donor-acceptor fullerene complex {Pt(dbdtc)2}•C60 and pristine C60

Photo-illumination hardening of C60 crystals

Raman Laser Polymerization ofC60Nanowhiskers

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