Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 389, Issue -, Pages 106-114Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.08.066
Keywords
Color transition; Optical sensor; Conjugated polymer; Conformational change; Self-assembling; Interfacial interaction
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Funding
- Ratchadaphiseksomphot Endowment Fund [CU's SRP_04_54_23_02]
- Thailand Toray Science Foundation
- Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University
- NANOTEC Center of Excellence at Mahidol University
- Center for Innovation in Chemistry
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In this work, polydiacetylene (PDA)/ZnO nanocomposites are successfully fabricated by using three types of monomers with different alkyl chain length, 5,7-hexadecadiynoic acid, 10,12-tricosadiynoic acid, and 10,12-pentacosadiynoic acid. The monomers dispersed in aqueous medium spontaneously assemble onto the surface of ZnO nanoparticles, promoted by strong interfacial interactions. The PDA/ZnO nanocomposites obtained via photopolymerization process are characterized by scanning electron microscopy, laser light scattering, infrared spectroscopy, and uv/vis absorption spectroscopy. The strength of interfacial interactions and morphologies of the nanocomposites are found to vary with alkyl chain length of the monomers. The PDA/ZnO nanocomposites also exhibit rather different thermochromic behaviors compared to their pure PDA counterparts. All nanocomposites show reversible blue/purple color transition upon multiple heating/cooling cycles, while the irreversible blue/red color transition is observed in the systems of pure PDAs. The shortening of alkyl side chain in PDA/ZnO nanocomposites leads to a systematic decrease in their color-transition temperatures. Colors of the nanocomposites at elevated temperature also vary with the alkyl chain length. Our results provide a simple route for controlling the reversible thermochromism of PDA-based materials, allowing their utilization in a wider range of applications. (C) 2012 Elsevier Inc. All rights reserved.
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