engleski

Digital holography of graphene paper acoustic membranes

Paper-like materials became almost unavoidable in industrial technology. Their applications are numerous, starting from protective and adhesive layers, chemical filters to electronic or optoelectronic components. Graphene paper, as one of the youngest foil-like materials is made by reassembly of exfoliated graphite flakes into a thin paper-like material. Its properties are superior compared to other materials when it comes to strength, stiffness and its macroscopic flexibility which make it potentially a good candidate as a new material for vibrating membranes which are primary elements of every condenser microphone, loudspeaker and many other acoustic devices. Here we report vibrating acoustic membranes made of graphene paper. We use digital holography to study the modal structures of the membranes. For comparison, we performed the same holographic measurements on membranes made of similar paper-like materials. We have found resonance frequencies and shapes of the vibrating modes for every tested material. We have also calculated eigenfrequencies for every given material. Graphene paper shows the richest modal behavior of all tested materials with multiple interesting and complex modes at frequencies between 40 Hz and 5 kHz. Our work is supported with numerical calculations which are in agreement with our experimental work.

holography, graphene, membrane

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