Transparent and skin-friendly speakers
Transparent and skin-friendly speakers
An innovative wearable technology that will turn our skin into a speaker has been publicly presented.
This advance is the work of the international team of Hyunhyub Ko in the School of Energy and Chemical Engineering of the National Institute of Science and Technology of Ulsán (UNIST), in South Korea.
Created in part to help people with hearing and speech problems, the new technology could also be adapted for other applications, such as wearable sensors (within the framework of the Internet of Things) or health care devices .
The soul of these unique speakers is an ultra-thin, transparent and conductive hybrid nanomembrane. With a thickness that is measured in nanometers, membranes of this type consist of a special structure of silver nanowires incorporated in a polymeric matrix.
The speaker manufactured from this type of nanomembrane can be attached to almost anything to produce sounds. Researchers have also built a device with similar characteristics but acting as a microphone with this technology. Microphones of this kind can be connected to smartphones and computers to unlock voice-activated security systems.
The new type of ultra-thin, transparent and conductive hybrid nanomembrane is the basis for virtually invisible skin-compatible speakers and microphones. (Image: UNIST)
Nanomembranes are ultra-thin separation layers, with a thickness that is measured in nanometers. For some time, the scientific community has been very interested in polymer nanomembranes due to its amazing advantages, such as its extreme flexibility, its ultra-light weight, and excellent adhesion that allows it to stick directly to almost any surface.
However, they tear easily and do not exhibit electrical conductivity.
The Hyunhyub Ko team has solved such problems by incorporating a network of metal nanowires within an essentially polymeric nanomembrane. This has made it possible to manufacture and test the unique loudspeakers and microphones, easily adhered to the skin and so thin that they are virtually imperceptible to the human eye.
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