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Sketch of the side view of rGO (20, 100, 200 nm) coated aluminum film (100 nm) on a glass substrate (500 μm).
Optoacoustic signals from each transmitter (Al-only, 20 nm rGO coated Al, 100 nm rGO coated Al, and 200 nm rGO coated Al) at 56 mJ/cm2 positioned 2.85 mm from the hydrophone.
Maximum pressure of optoacoustic wave from 100 nm rGO coated Al according to the distance between the transmitter and detector for varying laser fluences.
Maximum pressure of optoacoustic wave from 20 nm, 100 nm, 200 nm rGO coated Al and Al only for varying fluences as measured 2.85 mm from the sample.
Visualization images of propagating optoacoustic (left running) wave from 4 different transmitters (Al-only, 20 nm rGO coated Al, 100 nm rGO coated Al, 100 nm rGO only) positioned on the right for 3 laser fluences (17.8 mJ/cm2, 30.56 mJ/cm2, and 43.28 mJ/cm2) taken at 4 μs after the laser shot directed from the left.
Frequency spectra for the optoacoustic waves from 20 nm, 100 nm rGO coated Al and Al only) for 56 mJ/cm2 measured at 2.85 mm away from the sample.
Coefficient of thermal expansion for different materials.
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