Fig.4 (a) Schematic illustration of synthetic process of PdO@ZnO-SnO2 NTs; (b) SEM image of as-spun Pd@ZIF-8/PVP/Sn composite NFs;(c) TEM image of as-spun Pd@ZIF-8/PVP/Sn composite NFs;(d) SEM image of PdO@ZnO-SnO2 NTs;(e) Dynamic acetone response transition in the concentration range of 0.0001‰~0.005‰ at 400 ℃; (f) selective sensing characteristics of PdO@ZnO-SnO2 NTs toward 0.001‰ of various analytes at 400 ℃ [85]
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