This work describes the use of a paper substrate for electro-optical detection of toxic\nhydrogen sulfide (H2S) gas. For electrical detection, a chemiresistive type of gas sensor was\ndeveloped. Ultrathin gold film electrodes (UTGFE) were produced by physical vapor deposition of\ngold on nanostructured latex-coated paper substrate. The gas-sensing film was deposited on the\nelectrodes by inkjet printing. The sensing films were characterized by atomic force microscopy, X-ray\nphotoelectron spectroscopy and conductometry. The sensing films showed more than seven\norders of magnitude change in resistance when exposed to as low as 1 part per million (ppm) H2S\ngas at room temperature. Besides resistive response, the change in color of the sensing films was\nstudied on a paper substrate, both as a function of print density of the sensing material and H2S\nconcentration. For quantification of the analyte the red, green and blue color deconvolution was\nperformed on the pictures of the paper strip indicator using an open source software. A clear\nresponse was obtained from the blue channel. The inexpensive disposable color strips produced on\nthe paper substrate can be used for qualitative and quantitative detection (as low as 1.5 ppm) of H2S\ngas.
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