Researchers from Seoul's National University developed a transparent and lightweight speaker made from Graphene. This may enable speakers embedded in windows or displays. It may be especially suited to develop noise-cancelling devices.

The graphene speaker was made by depositing graphene-oxide onto poly vinylidene fluoride (or PVDF) and then reducing it to create a graphene film (this is actually a new method to develop graphene films). So basically this speaker is made from PVDF sandwiched between two graphene electrodes. When an electrical current (from the sound source) is applied, the converse piezoelectric effect causes the PDVF film to distort - and thus sound waves are created.