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Controlling the ultrasound frequency via modifying the diffusion layer. a) The ultrasound signals in time domain from FOEs fabricated with diffusion layers (ZnO/Epoxy) of 36−100 μm and absorption/thermal expansion layer (CNTs/PDMS) of 109 ± 24 μm. b) The frequency domain within 0–1.0 MHz of the ultrasound. c) Zoomed-out figure with frequency ranging from 0 to 5.0 MHz. d) Ultrasound peak frequency plotted as a function of the diffusion layer thickness: y = 0.51086-0.00431x, R2 = 0.93992.
