Table 2 Sound velocities and densities used for the viscoelastic simulation.

From: Viscoelastic properties and efficient acoustic damping in confined polymer nano-layers at GHz frequencies

Material

Sound velocity vl (ms−1)

Density ρ (kg m−3)

Gold

324025

1920025

Silicon

843017

234017

SiO2

585026

217026

APTES

—

1000

  1. The frequency dependent sound velocity of the APTES layer is given by the viscoelastic simulation (Fig. 4(b)).
    Figure 4
    figure 4

    Frequency dependence of (a) the storage modulus and loss modulus, (b) the sound velocity in the APTES layer, and (c) the acoustic absorption coefficient in the APTES layer.

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