Fluorescent responsive chlorophyllide-hydrogel for carbon dioxide detection

MARIANA HAMER; JUAN MANUEL LÁZARO MARTÍNEZ; IRENE REZZANO

SENSORS AND ACTUATORS B-CHEMICAL

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 237 p. 905 - 911

0925-4005

The chlorophyllide b derivatized polyallylamine (PAAChl) was synthesized. The resulting fluorescent polymer presents a high emission quantum yield, very stable in time. The polymer formed a hydrogel when treated with carbon dioxide that was characterized by Raman spectroscopy and solid-state NMR (ss-NMR). The adsorption of CO2 takes place through the formation of carbamate. Absorbance and fluorescence based analytical studies were performed. The UV-vis spectra of PAAChl, after additions of CO2, show a growing absorption peak at 250 nm corresponding to carbamate formation. The emission of fluorescence at 664 nm as function of carbon dioxide concentrations shows a linear regression with a detection limit of 2 ppm and a quantification limit of 5 ppm. The capacity of a chemical sensor was described by sensibility, selectivity, stability, response time and regeneration were also analyzed.