Fig. 4
From: Inflating hollow nanocrystals through a repeated Kirkendall cavitation process
Synthesis of hollow Pd nanocrystals with thin walls by repeating the Kirkendall cavitation process three times. a Schematic illustration showing the evolution of the molar ratio of P:Pd during repeated cavitation cycles. b–g HAADF-STEM images, high-resolution HAADF-STEM images of the obtained hollow nanocrystals after repeated cavitation cycles: b, e H-Pd-1 obtained by one cavitation cycle; c, f H-Pd-2 achieved by two cavitation cycles; and d, g H-Pd-3 produced by three cavitation cycles. Scale bars in b–d are 50 nm. Scale bars in e–g are 5 nm
