Fig. 4: Ex situ SEM.
From: In situ observation of oscillatory redox dynamics of copper
a SEM image recorded after rapid quenching of the redox dynamics. The darker structures correspond to the oxide islands that are embedded in copper metal. A red rectangular indicates the approximate position from where a TEM lamella was abstracted. b SEM image of the prepared lamella showing the deposited protective layer for FIB cutting and underneath, the cross-section of oxide islands on the copper. Please note that the oxide island already started to get reduced in the central part at the moment when the in situ SEM experiment was quenched. Red and green arrows indicate the propagation of the oxidation and reduction fronts. c Development of 110 facets is confirmed based on the structural model that is oriented according to the crystallographic orientations abstracted from lattice fringe images of the TEM lamella (see Fig. 5).
