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Bae, Sung Chul
Multiscale Optical Imaging Lab
Research Interests
  • Multiscale optical imaging, laser spectroscopy, laser microscopy, laser sensing, soft matter physics, surface and interfacial science, laser Matter Interaction

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Conjugated polymers confined and sheared: Photoluminescence and absorption dichroism in a surface forces apparatus

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Title
Conjugated polymers confined and sheared: Photoluminescence and absorption dichroism in a surface forces apparatus
Author
Bae, Sung ChulLin, ZQGranick, Steve
Issue Date
2005-11
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.38, no.22, pp.9275 - 9279
Abstract
Within a surface forces apparatus newly equipped for spectroscopic measurements, the photoluminescence and absorption spectra were studied of conjugated polymer films confined to less than the random coil dimension. A dilute solution of MEH-PPV, poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene), was exposed to atomically smooth surfaces of muscovite mica and allowed to adsorb from toluene, and then the surface spacing was reduced to approximate to 2 nm, which is less than the unperturbed radius of gyration of the polymer chains. Subsequent unidirectional shear with amplitude; 20 times the surface spacing provided preferential alignment while the solvent evaporated. Chain alignment was quantified from both photoluminescence and absorption spectra. Curiously, a bimodal distribution of chain alignment was observed, parallel to the shear direction in 2/3 of the cases but perpendicular to the shear direction in 1/3 of the cases. On the basis of analysis of the photoluminescence spectra, confinement and shear-induced changes of the electronic structure are also discussed. This is considered to be the first study of polymer absorption and photoluminescence spectra within the contact area of a surface forces apparatus.
URI
https://scholarworks.unist.ac.kr/handle/201301/7061
URL
https://pubs.acs.org/doi/10.1021/ma0510035
DOI
10.1021/ma0510035
ISSN
0024-9297
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CHM_Journal Papers
BME_Journal Papers
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