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A new optical CO 2 sensor based on the overlay of the CO 2 induced absorbance change of pH indicator dye thymol blue with the luminescence of europium(III) complex, tris(thenoyltrifluoroacetonato) europium(III) dihydrate complex [(Eu(tta) 3 )] was developed. The observed luminescence intensity from [(Eu(tta) 3 )] at 613nm increased with the increasing CO 2 concentration...
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