Wavelength dependence of ultrafast and large third-order non-linear optical response of polyacetylene nanoparticles

Pan, X. Y.; Chigarev, N. V.; Jiang, Hongbing; Huang, Wentao; Gong, Qihuang; Liu, C.L; Kobryanskii, V.M.; Paraschuk, Dmitry Yu.

doi:10.1016/s0009-2614(02)01376-3

Cited by 1 publication

(2 citation statements)

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“…NPA has potential applications in the field of optoelectronics. [2,12,13] High-pressure vibrational spectroscopy is a particularly important tool for studying molecular interactions in solids as it provides a fundamental probe of the physical properties that depend on the density of the material. [14 -16] High-pressure Raman studies are useful in discerning the existence of phase transitions and soft modes associated with compression of the matrix and/or the crystal.…”

Section: Introductionmentioning

confidence: 99%

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High‐pressure Raman spectroscopy of nanoparticle polyacetylene in a poly(vinyl‐butyral) matrix

McIntire

Zhao²,

Kobryanskii

et al. 2011

J Raman Spectroscopy

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The pressure-induced Raman shifts of six vibrational bands of 20% and 50% trans-polyacetylene nanoparticles in poly(vinylbutyral) matrix films (NPA/PVB) were studied from 0 to 45 kbar using a diamond anvil cell (DAC). The Raman shifts did not depend on the thickness of the two samples studied. Two of the vibrational bands displayed peak positions that depended on the isomeric compositions, with the 20% trans-NPA/PVB bands being slightly blue-shifted relative to the 50% trans-NPA/PVB bands over the 45 kbar pressure range. The Raman bands of NPA/PVB associated with the trans form initially exhibited a relatively large shift at low pressures (P < 10 kbar) along with a drastic change in their band profile. In order to investigate the relative shielding of the vibrational modes studied, a Grüneisen analysis of the pressure-induced shifts was conducted by estimating the parameters of the Murnaghan equation of state for solid polyacetylene (PA). Four of the six vibrational modes were found to be sensitive to compression of the interchain void space, while the other two modes were insensitive, indicating that they are relatively shielded from the compression of the sample.

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Section: Introductionmentioning

confidence: 99%

“…In the absence of defects, coherent oscillations of π‐electrons and resonant interactions between macromolecules can lead to phase transitions and the proposed macro‐quantum properties of conjugated polymers. NPA has potential applications in the field of optoelectronics 2, 12, 13…”

Section: Introductionmentioning

confidence: 99%