Tech Briefs Magazine - November 2021 - 10
5
Who
The wearable device turns the touch of a finger into a source of power for small electronics and sensors. It can be
used in any daily activity involving touch; for example, things a person would normally do while at work, at home,
while watching TV, or eating.
What
A thin, flexible strip can be worn on a
fingertip to generate small amounts of
electricity when a person's finger sweats
or presses on it. It generates power even
while the wearer is asleep or sitting still,
requiring no exercise or physical input.
The wearable energy harvester generates
extra power from light finger presses
- activities such as typing, texting,
or playing the piano become sources of
energy. A padding of carbon foam electrodes
absorbs sweat and converts it
into electrical energy. The electrodes
are equipped with enzymes that trigger
chemical reactions between lactate and
oxygen molecules in sweat to generate
electricity. Underneath the electrodes is
a chip made of piezoelectric material
that generates additional electrical energy when pressed. As the wearer sweats or presses on the strip, the electrical
energy gets stored in a small capacitor and is discharged to other devices when needed.
Where
University of California, San Diego
Why
The wrap could serve as a power source anytime, anywhere, without the limitations of solar cells, which only work
under sunlight, or thermoelectric generators, which only work when there's a large temperature difference between
the device and the surroundings. From 10 hours of sleep, the device collected almost 400 millijoules of energy -
enough to power an electronic wristwatch for 24 hours. Putting the wraps on all ten fingertips would generate 10
times more energy.
When
The team is making further improvements to the device so that it is more efficient and durable. Future studies will
include combining it with other types of energy harvesters to create a new generation of self-powered wearable systems.
Contact: Liezel Labios at llabios@ucsd.edu; 858-246-1124. Watch a demo of the finger wrap on Tech Briefs TV at
www.techbriefs.com/tv/finger-wrap
10
Cov
www.techbriefs.com
ToC
Tech Briefs, November 2021
Powering Finger Wrap
Ws of the Electronics
http://www.techbriefs.com/tv/finger-wrap
http://www.techbriefs.com
http://info.hotims.com/79419-902
Tech Briefs Magazine - November 2021
Table of Contents for the Digital Edition of Tech Briefs Magazine - November 2021
Tech Briefs Magazine - November 2021 - Intro
Tech Briefs Magazine - November 2021 - Sponsor
Tech Briefs Magazine - November 2021 - Cov1
Tech Briefs Magazine - November 2021 - Cov2
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