We report a deposition of the tin oxide/hydroxide nanostructured layer by the potentiodynamic\nmethod from acidic nitrate solutions directly over the substrate, equipped with multiple strip electrodes\nwhich is employed as a gas-analytical multisensor array chip. The electrochemical synthesis is set to favor\nthe growth of the tin oxide/hydroxide phase, while the appearance of metallic Sn is suppressed by cycling.\nThe as-synthesized tin oxide/hydroxide layer is characterized by mesoporous morphology with grains,\n250ââ?¬â??300 nm diameter, which are further crystallized into fine SnO2 poly-nanocrystals following heating\nto 300 ââ??¦C for 24 h just on the chip. The fabricated layer exhibits chemiresistive properties under exposure\nto organic vapors, which allows the generation of a multisensor vector signal capable of selectively\ndistinguishing various vapors.
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