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(a) SEM images of Pd NPs deposited on MWCNTs by electrodeposition for (1) 1, (2) 5, and (3) 10 cycles. Pd NPs density increases with the number of electrodeposition cycles. (b) Sensitivities of MWCNTs/Pd sensors as a function of H2 concentration with respect to number of deposition cycles (increasing density). Reprinted with permission from [9]. Copyright 2014 Chemical Physics Letters.
