Presented in this work is a novel and facile approach to fabricate an elastic, attachable, and cost-efficient carbon nanotube (CNT)-based strain gauge which can be efficiently used as bodily motion sensors.
Body sensors, which were once restricted to doctors’ offices, have come a long way. They now allow any wearer to easily track heart rate, steps and sleep cycles around the clock. Soon, they could become even more versatile – with the help of chewing gum. Scientists report a unique sensing device made of gum and carbon nanotubes that can move with your most bendable parts and track your breathing.
Most conventional sensors today are very sensitive and detect the slightest movement, but many are made out of metal ie when twisted or pulled too much, they stop working. But to monitor the full range of a body’s bending and stretching, they need a lot more give. To meet that need, some researchers have tried developing sensors using stretchy plastics and silicones. But what they gained in flexibility, they lost in sensitivity. Malcolm Xing and colleagues found a better solution right under their noses – and in their mouths.
To make their supple sensor, a team member chewed a typical piece of gum for 30 minutes, washed it with ethanol and let it sit overnight. They added a solution of carbon nanotubes, the sensing material. Simple pulling and folding coaxed the tubes to align properly. Human finger-bending and head-turning tests showed the material could keep working with high sensitivity even when strained 530%. The sensor also could detect humidity changes, a feature that could be used to track breathing, which releases water vapor with every exhale.
Video: https://www.youtube.com/watch?v=2HS3-eWpOJY&feature=youtu.be
http://www.acs.org/content/acs/en/pressroom/presspacs/2015/acs-presspac-december-2-2015/gum-sensor.html
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