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. Author manuscript; available in PMC: 2010 Mar 13.
Published in final edited form as: Nat Chem. 2009 Sep 13;1:562–567. doi: 10.1038/nchem.360

Fig. 1. The colorimetric sensor array (CSA) consists of 36 different chemically responsive pigments that have been printed directly on a polyethylene terephthalate (PET) film.

Fig. 1

a An image of the array from an ordinary flatbed scanner with the different pigment classes labeled. b. Molecular structures of examples from each dye class are shown; in order to absorb visible light, dyes are inherently nanoscale, as noted by the scale bar. The 36 dyes were selected empirically based on the quality of their color response to a representative selection of chemically diverse analytes.