Fig. 4: Analysis of the growth process from a 3D perspective.
From: Imaging Cu2O nanocube hollowing in solution by quantitative in situ X-ray ptychography
a In situ ptychographic image highlighting the in-plane dimension of the nanocuboids by green rectangles. The out-of-plane thickness is calculated from the phase shift within the area highlighted by blue rectangles. The gray scale indicates the quantitative phase shift of the image in radian. b Evolution of the aspect ratio for all particles highlighted in Fig. 3b. The aspect ratio is calculated as the quotient of the in-plane dimension and the out-of-plane thickness of the nanocuboids. A moving average (MA) window of four time steps is applied. See Supplementary Fig. 12 for a plot without MA. The yellow color indicates the time when a particle attaches to the substrate. While the aspect ratio of individual particles does not change significantly with reaction time, it is strongly affected by the time when a particle attaches. The later the attachment takes place during the growth phase, the more cubic the respective particle becomes. This process is illustrated in c. For clarity, the error bar in b represents the mean error resulting from the error propagation of the in-plane particle size and the out-of-plane thickness of all tracked particles (for details, see Supplementary Note 3).
