Controlling the reversible thermochromism of polydiacetylene/zinc oxide nanocomposites by varying alkyl chain length

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• 作者：Amornsak Chanakul^a ; ^b ; Nisanart Traiphol^a ; ^b ; ^{Nisanart.T@chula.ac.th} ; Rakchart Traiphol^c ; ^d ; ^{Rakchartt@nu.ac.th}
• 关键词：Color transition ; Optical sensor ; Conjugated polymer ; Conformational change ; Self-assembling ; Interfacial interaction
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：389
• 期：1
• 页码：106-114
• 全文大小：1925 K

文摘

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.