Supakorn SeethaRungarune SaymungRakchart TraipholNisanart TraipholChulalongkorn UniversityMahidol University2020-01-272020-01-272019-04-25Journal of Industrial and Engineering Chemistry. Vol.72, (2019), 423-431223459571226086X2-s2.0-85059449589https://repository.li.mahidol.ac.th/handle/20.500.14594/50512© 2019 The Korean Society of Industrial and Engineering Chemistry Polydiacetylene/zinc(II) ion/zinc oxide (PDA/Zn2+/ZnO) nanocomposite exhibits reversible thermochromism and dual colorimetric response to acid/base. This contribution presents our ongoing development of the PDA/Zn2+/ZnO nanocomposite for sensing applications by controlling ZnO surface charge and dissociation of PDA headgroup via pH adjustment. At pH >10, negative ZnO surface charge and PDA carboxylate headgroup significantly enhance molecular organization during the self-assembling process. An increase of the nanocomposite amount after photopolymerization is observed. Oppositely, pH <6 results in irreversible-thermochromic nanocomposites. Additionally, the nanocomposites prepared at different pH change color at different concentrations of chemical stimuli. Molecular packing, local interactions and PDA conformation are investigated.Mahidol UniversityChemical EngineeringArticleSCOPUS10.1016/j.jiec.2018.12.045