Nearly 32X more sensitive than microphones of standard nickel-based construction, University of Belgrade researchers created a vibrating membrane – the part of a condenser microphone which converts the sound to a current, from graphene, with up to 15 dB higher sensitivity compared to a commercial microphone, at frequencies up to 11 kHz.
“We wanted to show that graphene, although a relatively new material, has potential for real world applications” explains Marko Spasenovic. “Given its light weight, high mechanical strength and flexibility, graphene just begs to be used as an acoustic membrane material.”
The graphene membrane, approximately 60 layers thick, was grown on a nickel foil using chemical vapour deposition, to ensure consistent quality across all the samples...
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