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Structure control of poly(p-phenylene vinylene) in layer-by-layer films by deposition on a charged poly(o-methoxyaniline) cushion
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Image of FIG. 1.
FIG. 1.

Chemical formula of poly(o-methoxyaniline) emeraldine salt.

Image of FIG. 2.
FIG. 2.

Thermal conversion of PTHT (a) into PPV (c), through the alternative route (b) using DBS as counter ion.

Image of FIG. 3.
FIG. 3.

Linear absorption spectra of POMA-PPV/DBS films converted at (a) 110 °C and (b) 230 °C for POMA layers YY = 10 and PPV/DBS bilayers ZZ = 05, 25, and 50. Absorbance intensity at 440 nm as a function of the number of layers of PPV/DBS bilayers for films converted at 110 °C (c) and 230 °C (d). The dashed lines are just to guide the eyes.

Image of FIG. 4.
FIG. 4.

Temperature dependence of photoluminescence spectra of LbL POMA-PPV/DBS films: (a) A230 0225 and (b) A230 0025. (c) Temperature dependence of the integrated photoluminescence for samples A110 0205, A230 0205, A110 2025, A230 2025, and A230 0025.

Image of FIG. 5.
FIG. 5.

Raman spectra recorded with the 785 nm laser line for POMA-PPV/DBS LbL films prepared under different conditions: (a) A1100205, A1100505, A1101005, and A1102005, (b) A1100225, A1100525, A1101025, and A1102025, (c) A2300205, A2300505, A2301005, and A2302005, and (d) A2300225, A2300525, A2301025, and A2302025.

Image of FIG. 6.
FIG. 6.

Normalized absorbance and excitation spectra in the UV-Vis region for POMA-PPV/DBS LbL films with (i) 2 POMA layers and 25 PPV/DBS layers thermally converted at 110 °C (a) and at 230 °C (b), and (ii) 20 POMA layers and 50 PPV/DBS layers thermally converted at 110  °C (c) and at 230  °C (d).

Image of FIG. 7.
FIG. 7.

Relative energy in function of torsion angle between adjacent PPV monomers under the influence of an external static electric field, 0 V/Å (close circles) and 1 V/Å (open circles).

Image of FIG. 8.
FIG. 8.

Illustrative scheme of a POMA-PPV/DBS LbL film and the electric field associated with the surface charge on the POMA layer.


Generic image for table
Table I.

Huang-Rhys factor obtained from emission spectra of POMA-PPV/DBS LbL films obtained at 16 and 300 K.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structure control of poly(p-phenylene vinylene) in layer-by-layer films by deposition on a charged poly(o-methoxyaniline) cushion