Upconverting nanoparticle based optical sensor for carbon dioxide

DOI to cite this document:: 10.5283/epub.19957

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

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Abstract

We demonstrate a novel optical sensor for carbon dioxide in concern rations between 0 and 3% The sensing scheme is based on the optical interrogation of a 12-mu m 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 ...