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Supakorn Seetha,Rungarune Saymung,Rakchart Traiphol,Nisanart Traiphol 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Polydiacetylene/zinc(II) ion/zinc oxide (PDA/Zn2+/ZnO) nanocomposite exhibits reversible thermochromismand dual colorimetric response to acid/base. This contribution presents our ongoingdevelopment of the PDA/Zn2+/ZnO nanocomposite for sensing applications by controlling ZnO surfacecharge and dissociation of PDA headgroup via pH adjustment. At pH >10, negative ZnO surface charge andPDA carboxylate headgroup significantly enhance molecular organization during the self-assemblingprocess. An increase of the nanocomposite amount after photopolymerization is observed. Oppositely,pH <6 results in irreversible-thermochromic nanocomposites. Additionally, the nanocompositesprepared at different pH change color at different concentrations of chemical stimuli. Molecularpacking, local interactions and PDA conformation are investigated.