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Sensors/MEMS  

Graphene film process enables thin, transparent speakers

Posted: 01 Aug 2011  Print Version  Bookmark and Share

Keywords:graphene  controlled graphene  loudspeaker 

Jyongsik Jang has developed and new way of making controlled graphene films and in the process was able to use the material to create a thin, transparent loudspeaker.

Jang, together with his co-workers from Seoul National University, used inkjet printing and vapor deposition to deposit graphene oxide onto poly(vinylidene fluoride) (PVDF). The mixture is then reduced to create a graphene film. The procedure demonstrated a new method of making controlled graphene films. Not only that, it also showed a new use for the material—for making a thin, transparent loudspeaker.

The speaker system consists of a PVDF thin film 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, creating sound waves.

This type of system would be easy to install and usable anywhere where sound is needed, Jang explains. They could even eventually be used as noise cancelling devices by creating anti-noise waves (same amplitude but with inverted phase to the original sound).

Although similar speakers are already available commercially, using PEDOT:PSS electrodes, Jang's new system demonstrates advantages over this existing technology in terms of cost and power consumption. "Graphene is cheaper than other electrodes, such as metals and conducting polymers," he said, "and the graphene-based acoustic actuator does not need expensive high power voltage amplifiers due to low power consumption."

- Julien Happich
  EE Times





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