Researchers at Seoul National University have developed a new production method for controlled graphene film, which also makes thin transparent speakers.
The team used inkjet printing and vapour deposition to deposit graphene oxide onto polyvinylidene fluoride (PDVF), which is then reduced to create the film. The speaker uses a PDVF film sandwiched between two graphene electrodes, which cause a converse piezoelectric effect when current is applied, making the film distort and creating sound waves. Being based on a thin-film, such a product can be installed anywhere sound is required, states a report by EE Times India.
While thin PEDOT based speakers are available commercially, the graphene used in this new version requires less power, and can be produced more cost effectively.
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EE Times India report
Graphene films aid thin, transparent speaker design
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