engleski

Digital holography of graphene paper acoustic membranes and comparison to other paper – like materials

Paper – like materials are becoming an important component of 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 paper – like materials has favorable properties for all those applications, but also for novel applications in acoustics. Graphene paper is superior to other acoustic materials because it is lightweight, stiff, and has a large tensile strength. The aim of our project is to investigate the real – world potential of graphene – based acoustic membranes. Here we report acoustic membranes made of graphene paper. We use time – averaged digital holography to study the vibrational modes of the membranes. Graphene paper shows a rich modal behaviour in the audible part of the spectrum with multiple interesting and complex modes at frequencies between 40 Hz and 4 kHz. Numerical calculations confirm our experimental data, indicating a low pre – tension force (12.5 – 75 Nm-1). For comparison, we performed the same holographic measurements on membranes made of Mylar polyester film, paraffin film, aluminium foil and different kinds of filter paper. We have found resonant modes for each tested membrane, with graphene paper showing the richest behaviour. Our calculations indicate that more tightly pulled graphene paper membranes could be useful for applications in acoustics.

digital holography, graphene, membrane

nije evidentirano