In-situ observation of self-assembly of quasi-two-dimensional Au nano-submicron particles on β-SiC substrates via nanosecond-pulsed laser irradiation-induced dewetting of thin Au films

• Dewetting of Au thin film during laser irradiation was observed by in-situ HVEM.
• The initial stages of Au-NPs array arrangements on β-SiC substrate were observed.
• Long-range quasi-two-dimensional Au-NPs arrangements were found.
• Our results provide direct evidence for the Rayleigh instability mechanism.
• After laser irradiation, the broad photo absorption spectra was observed.

Herein is reported the dots alignment of Au nano-submicron particles (Au-NPs) on a chemical vapor-deposited β-SiC substrate through nanosecond-pulsed laser irradiation-induced dewetting of an Au thin film, which was successfully observed by in-situ high-voltage electron microscopy. The initial stages of the Au-NPs array arrangement were also successfully observed, and long-range quasi-two-dimensional Au-NPs arrangements were found after laser irradiation. Moreover, the effect of Rayleigh instability to form multiple Au-NPs in each line of the network structure after the hole growth in the Au thin film was confirmed.