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Upconverting nanoparticle based optical sensor for carbon dioxide

Ali, Reham ; Saleh, Sayed M. ; Meier, Robert J. ; Azab, Hassan A ; Abdelgawad, Ibraheim I. ; Wolfbeis, Otto S.
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Date of publication of this fulltext: 18 Mar 2011 06:44


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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