Poly-glycerol acrylate and curcumin composite: its dual emission fluorescence quenching and electrical properties for sensing 2-vinyl pyridine

A simple and highly selective chemosensor has been developed from a new polymer composite of poly-glycerol acrylate and curcumin for the detection of 2-vinyl pyridine (2-VP). The sensor system undergoes a remarkable fluorescence quenching and a drastic change in electrical properties in the presence of 2-VP. The aqueous solution of the probe possesses two well-resolved peaks at 301 and 357 nm at lambda (ex) of 200 nm. Interestingly, the first peak undergoes 100 % quenching in the presence of 2-VP at a concentration of as low as 10 nM, while the intensity of the second peak gradually decreases with the increase in the concentration of the analyte. The limit of detection is about 10.39 nM of 2-VP. The electrical properties are studied by monitoring DC current-voltage characteristics and ac impedance response in the presence of saturated vapor of 2-VP. In DC current-voltage characteristics, interaction of the analyte vapor decreases the current density up to 84.7 and 83.13 % at an applied bias voltage of -5 to +5 V, respectively. The impedance response, on the other hand, increases up to about 79 % at lower frequency range. A very simple, low cost and room temperature operable device has been designed for the electrical measurements.