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FE-SEM images of electrospun (a) pure porous PS NFs and (b) G-COOH/PS composite NFs. (c) Dynamic response of G-COOH/PS NFs to NH3; inset shows the response of PS NFs. (d) Reversibility testing for QCM sensors coated with G-COOH/PS membranes upon exposure to increased ammonia concentrations. Reproduced with permission from [268], copyright 2015 Royal Society of Chemistry.
