Seoul National University of Korea developed a graphene film speaker

Researchers at Seoul National University in South Korea used inkjet printing and vapor deposition techniques to deposit graphene oxides on polyvinylidene fluoride to produce graphene films. This not only provides a new method for the production of controllable graphene films, but also opens up a new application for graphene materials: the production of slim, transparent loudspeakers.

The speaker is a PVDF film sandwiched between two graphene electrodes. The inverse piezoelectric effect caused by the current from the sound source will distort the PDVF film and create sound waves. Seoul National University researchers said that the installation of such a system is very simple, can also be applied to all places that need to play, or can be used as a noise removal device by generating anti-noise wave.

It is understood that similar loudspeakers using PEDOT:PSS electrodes are already available, but the technical advantages developed by the research team of Seoul National University are cost and power consumption. "Graphene is cheaper than other electrode materials, such as metals or conductive polymers;" the researchers said, "In addition, the graphene acoustic actuators do not have to be matched with expensive high-voltage amplifiers, so power consumption is also high. Lower."