Figure 2
Crystallinity of growing Cu2O nanocubes. (a–c) In situ ptychographic reconstructions during the growth of the Cu2O nanocubes overlaid with the spatially resolved nano-diffraction signal. The crystallographic orientation is highlighted by color, whereas the gray scale indicates the phase shift of the object in radian as obtained by ptychography. While most of the single-crystalline nanocubes are oriented in a way not fulfilling the Bragg condition, the particle marked with an arrow diffracts at the (111) plane. (d) Same ptychographic reconstruction as in c, but here the overlay indicates the azimuthal orientation of the (111) crystallographic plane. The highlighted particle exhibits an azimuthal rotation of \(\rm{{\phi}}\approx 8^{\circ}\). (e) Schematic illustration of the single-particle diffraction geometry showing the incident beam \(\overrightarrow{{k}_{i}}\), the diffracted beam \(\overrightarrow{{k}_{f}}\) and the scattering vector \(\overrightarrow{q}\). It allows to estimate the particle orientation from the position of its (111) reflection. The rotation angle around the normal of the crystallographic plane remains undefined. (f) Magnification of the nanocube highlighted in (a–d). In (g), this particle is shown together with a schematic cube representing one possible orientation determined from the diffraction experiment. The orientation of the cubic Cu2O crystal lattice matches that of the cubic particle.
