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. Author manuscript; available in PMC: 2022 Dec 9.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2021 Nov 24;125(48):26718–26730. doi: 10.1021/acs.jpcc.1c06684

Figure 1. Fragmentation threshold fluences for gold nanosphere (AuNP) by laser irradiation.

Figure 1.

(A) Experimental and analysis procedure for fragmentation of AuNPs. (B-C) Extinction analysis and TEM images for fragmentation of AuNPs (diameter = 15 nm) by picosecond laser (B, Full width half maximum, FWHM = 28 ps) and nanosecond laser (C, FWHM = 6 ns). For picosecond laser, the normalized ratio at 500/525 nm shows increases when fluence is large than 1 mJ/cm2. For nanosecond laser, the ratio (450/500 nm) increase occurs when laser fluence is higher than 300 mJ/cm2 as the fragmentation threshold. TEM images support extinction analysis for fragmentation. (D-E) Extinction analysis for different particle sizes under picosecond laser (D) and nanosecond laser (E). (F) Threshold fluences of fragmentation under picosecond and nanosecond laser for different particle sizes. Note that the reported laser fluences are the peak fluence of the Gaussian energy distributions at the surface of irradiated sample wells.