Fig. 1: In situ observation of Pt deposition on Pd cubic seeds in the presence of Br−-capping for faces.
From: Atomistic insights into the nucleation and growth of platinum on palladium nanocrystals
a–e Time-elapsed in situ TEM images recorded from one of the corners of a Pd cubic seed (with FFT in the inset): a The cubic seed. b Initial deposition of Pt on the corner. c Continuous deposition of Pt on the corner. d Thinning of the Pt just deposited on the corner. e Formation of a conformal Pt shell. The white and red dotted lines indicate the projected profiles of Pd and Pt, respectively. f The thicknesses of Pt on the corner and adjacent face, respectively, as a function of time. g–j Schematics of the growth behavior of Pt on a Pd cubic seed in the presence of Br−-capping for faces. k–n Ex situ atomic-resolution HAADF-STEM images showing Pt deposition on the corner, followed by diffusion onto adjacent edges and faces. The scale bar under panel e applies to panels a–e and the scale bar under panel n applies to panels l–n. Scale bars: 5 nm.
