Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.33: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Unique colorimetric response of polydiacetylene-Na+ microcrystals for detection of hydrochloric acid by naked eye — •Rungarune Saymung1, Christine M. Papadakis2, Nisanart Traiphol3, and Rakchart Traiphol1 — 1School of Materials Science and Innovation, Faculty of Science, Mahidol University, Nakhon Pathom, Thailand — 2Physics Department, Technical University of Munich, Garching, Germany — 3Materials Science Department, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
Polydiacetylenes (PDA), a class of conjugated polymers, are very promising as colorimetric sensors because the change of the color can be easily observed. The commercially available PDA with carboxylic head groups changes color from blue at acidic to red in basic condition. To develop this class of materials for pH sensing applications, many research groups synthesize PDA-based materials by structural modification or addition of foreign materials. Studies by our research group illustrate that incorporating ZnO nanoparticles with PDAs lead to colorimetric response to both acids and bases. Herein, we explore a new route by introducing Na+ ions into the PDA system. Upon exposure to hydrochloric acid (HCl) solution, the PDA-Na microcrystals exhibit a unique red to blue color-transition, which has never been observed before. To understand the origins of this behavior, various techniques are employed including Fourier-transformed infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and X-ray diffraction (XRD).