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(Color online) Room temperature PL spectra of investigated samples in dry air. Inset: PL spectra of S1 sample at different concentrations.
Normalized PL signal as a function of gas concentration inside the test chamber.
(Color online) Relative response vs gas concentration for the S1 sample, The quantity is defined as and is measured in percent units in the graph.
Fit parameters obtained using exponential growth formula .
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