In situ ESTEM-HAADF observations of sintering dynamics at the single atom level in 3 Pa H2at 250 C from the same local area of particles 17 and 18. Images are recorded at time intervals of (A)t= 10 min, (B)t= 40 min, and (C)t= 70 min. A decrease in the single atom density is observed in (B), with an increased disorder of particles 17 and 18. The dynamic observations reveal that as the particles are extinguished the local single atom density increases, as shown in (C). Experimental brightness and contrast conditions were kept the same over the experiments as far as possible. Reproduced with permission.[39]Copyright 2020, The Royal Society.
