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We report studies of cobalt oxyhydrates Na x (H 2 O) y CoO 2 as potential humidity sensor. All the samples are of single phase with hexagonal structure. Direct-current conductivity measurements as a function of humidity are carried out using four-probe sensing techniques. Na 0.33 K 0.02 (H 2 O) 1.33 CoO 1.95 and Na 0.07 ...
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