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. 2015 Jun 1;5:10601. doi: 10.1038/srep10601

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. (b) Sensitivity of the prepared TF-F sample as the gas ambient is switched from air to various concentrations (100–500 ppm) of hydrogen at room temperature. (c) Dynamic gas response (R_a/R_g ) of the prepared TF-F sample at 500 ppm.