Synthesis and Characterization of Polydiacetylene Films and Nanotubes

We report here the synthesis and characterization of polydiacetylene (PDA) films and nanotubes using layer-by-layer (LBL) chemistry. 10,12-Docosadiyndioic acid (DCDA) monomer was self-assembled on flat surfaces and inside of nanoporous alumina templates. UV irradiation of DCDA provided polymerized-D...

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Bibliographic Details
Published in:Langmuir 2008-10, Vol.24 (20), p.11947-11954
Main Authors: Gatebe, Erastus, Herron, Hayley, Zakeri, Rashid, Ramiah Rajasekaran, Pradeep, Aouadi, Samir, Kohli, Punit
Format: Article
Language:English
Subjects:
Carboxylic Acids - chemistry
Chemistry
Colloidal state and disperse state
Equipment Design
Exact sciences and technology
General and physical chemistry
Ions
Materials: Nano-and Mesostructured Materials, Polymers, Gels, Liquid Crystals, Composites
Microscopy, Electron, Scanning
Models, Statistical
Nanotechnology - instrumentation
Nanotechnology - methods
Nanotubes - chemistry
Polyacetylene Polymer
Polymers - chemistry
Polyynes - chemistry
Porous materials
Quartz
Spectrometry, Fluorescence - methods
Spectrophotometry - methods
Spectrophotometry, Ultraviolet - methods
Spectroscopy, Fourier Transform Infrared - methods
Surface physical chemistry
Zirconium - chemistry
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Summary:We report here the synthesis and characterization of polydiacetylene (PDA) films and nanotubes using layer-by-layer (LBL) chemistry. 10,12-Docosadiyndioic acid (DCDA) monomer was self-assembled on flat surfaces and inside of nanoporous alumina templates. UV irradiation of DCDA provided polymerized-DCDA (PDCDA) films and nanotubes. We have used zirconium-carboxylate interlayer chemistry to synthesize PDCDA multilayers on flat surfaces and in nanoporous template. PDCDA multilayers were characterized using optical (UV−vis, fluorescence, ellipsometry, FTIR) spectroscopies, ionic current−voltage (I−V) analysis, and scanning electron microscopy. Ellipsometry, FTIR, electronic absorption and emission spectroscopies showed a uniform DCDA deposition at each deposition cycle. Our optical spectroscopic analysis indicates that carboxylate-zirconium interlinking chemistry is robust. To explain the disorganization in the alkyl portion of PDCDA multilayer films, we propose carboxylate-zirconium interlinkages act as “locks” in between PDCDA layers which restrict the movement of alkyl portion in the films. Because of this locking, the induced-stresses in the polymer chains can not be efficiently relieved. Our ionic resistance data from I−V analysis correlate well with calculated resistance at smaller number of PDCDA layers but significantly deviated for thicker PDCDA nanotubes. These differences were attributed to ion-blocking because some of the PDCDA nanotubes were totally closed and the nonohmic and permselective ionic behaviors when the diameter of the pores approaches the double-layer thickness of the solution inside of the nanotubes.
ISSN:0743-7463
1520-5827
DOI:10.1021/la801948z