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Ink-jet printing has been used to fabricate paper strips for the direct measurement of Fe(II) ions by means of a solid-state colorimetric assay. Toward this end, 2,$2^{\prime }$ -bipyridyl dye entrapped in a Nafion matrix was used and subsequently immobilized onto the paper strips. An apparatus for the simple readout of the paper strips, comprising a CMOS camera that allows to acquire Red, Green...
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