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Optoacoustic signal frequency as a function of effective absorption/expansion layer thickness. a) Normalized frequency spectrum for FOEs with a different thermal expansion layer (CNTs/PDMS, 2.5 %, 5.0 %, 7.5 %, 10.0 % by weight). b) Peak frequency plotted as a function of CNTs/PDMS concentration. Each data point in b) is the average value of two identical FOEs for each concentration and error bars are the standard deviation.
