Template synthesis of highly oriented polyfluorene nanotube arrays

被引：41

作者：

Moynihan, Shane ^{[1
]}

Lacopino, Daniela ^{[1
]}

O'Carroll, Deirdre ^{[1
]}

Lovera, Pierre ^{[1
]}

Redmond, Gareth ^{[1
]}

机构：

[1] Tyndall Inst, Cork, Ireland

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 03期

关键词：

D O I：

10.1021/cm071658f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Polyfluorene nanotubes are synthesized by solution assisted wetting of porous anodic alumina membranes. Well aligned arrays of close packed (similar to 10(9) tubes/cm(-2)) discrete nanotubes are obtained. Individual tubes have diameters of similar to 260 nm and wall thicknesses of similar to 50 nm. X-ray diffraction measurements carried out on nanotube arrays embedded in host templates indicate a polymer chain alignment along the long axes of the template pores and, as a result, along the long axes of the nanotubes themselves. Optical spectroscopic studies of mats of nanotubes on glass substrates yield well resolved emission spectra reflecting a narrowed distribution of emitting chain segments with increased effective conjugation lengths. The data indicate intrachain reorientation of the amorphous random poly(9,9-dioctylfluorene-2,7-diyl) molecular conformation to the more planar (low energy) extended 2(1) helical beta-phase conformation within the tubes. Raman spectra acquired for template embedded tubes are also consistent with beta-phase formation. Finally, polarization resolved photoluminescence data demonstrate a pronounced axial orientation of the emissive beta-phase chains within the tubes.

引用

页码：996 / 1003

页数：8

共 38 条

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