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. Author manuscript; available in PMC: 2023 Nov 29.
Published in final edited form as: ACS Appl Nano Mater. 2021 Nov 11;4(11):12073–12082. doi: 10.1021/acsanm.1c02623

Figure 1.

Figure 1.

(a) The photoacoustic response of gold nanorods at low laser fluence is produced by the heating of the nanorods and surrounding fluid. If the physical properties of the particle and fluid are not temperature dependent, then a linear relationship between fluence and photoacoustic response is expected. (b) In surface modified silica coated nanorods, vaporization of the liquid surrounding the nanorods leads to bubble formation and a highly nonlinear photoacoustic response. Schematics are not drawn to scale.