عنوان مقاله [English]
In this paper the thermos-acoustic properties of graphene oxide thin film samples synthesized using the vacuum filtration method on the porous Polyvinylidene fluoride membranes have been investigated experimentally. To this end the electric impedance of the samples measured after mounting proper electrodes. In spite of minor fluctuation, the measured impedances are constant and pure resistive. In the following by applying AC voltage in the frequency range 150Hz-20kHz, the radiated sound pressure level of the samples have been measured using the sound level meter. The results indicate that the frequency of the radiated sound waves is twice the frequency of the exciting voltage, as expected in the thermos-acoustic effects. In addition it is found that the radiated sound pressure level of the samples increase monotonically by frequency and the exciting electric voltage and decreases by the resistance of the samples. Investigation of the sound pressure as function of the frequency represents an additional peak in the frequency of applied voltage.