Upconverting nanoparticle based optical sensor for carbon dioxide

Ali, Reham, Saleh, Sayed M., Meier, Robert J., Azab, Hassan A, Abdelgawad, Ibraheim I. and Wolfbeis, Otto S. (2010) Upconverting nanoparticle based optical sensor for carbon dioxide. Sensors and Actuators B: Chemical 150 (1), pp. 126-131.

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Abstract

We demonstrate a novel optical sensor for carbon dioxide in concentrations between 0 and 3%. The sensing scheme is based on the optical interrogation of a 12-μm polystyrene (PS) film containing upconverting nanoparticles (UCNPs; 40–100 nm in size) of the type NaYF4:Yb,Er, and the longwave absorption pH probe bromothymol blue (BTB) in its anionic (blue) form. PS is chosen as a matrix because it ...

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