Journal
SENSORS
Volume 14, Issue 1, Pages 868-876Publisher
MDPI
DOI: 10.3390/s140100868
Keywords
piezoresistive sensor; soft wearable sensors; electro-mechanical properties; film composite; stretchable device; carbon nanotubes; health monitoring
Funding
- National Research University Project under Thailand's Office of the Commission on Higher Education (CHE)
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Conventional metallic strain sensors are flexible, but they can sustain maximum strains of only similar to 5%, so there is a need for sensors that can bear high strains for multifunctional applications. In this study, we report stretchable and flexible high-strain sensors that consist of entangled and randomly distributed multiwall carbon nanotubes or graphite flakes on a natural rubber substrate. Carbon nanotubes/graphite flakes were sandwiched in natural rubber to produce these high-strain sensors. Using field emission scanning electron microscopy, the morphology of the films for both the carbon nanotube and graphite sensors were assessed under different strain conditions (0% and 400% strain). As the strain was increased, the films fractured, resulting in an increase in the electrical resistance of the sensor; this change was reversible. Strains of up to 246% (graphite sensor) and 620% (carbon nanotube sensor) were measured; these values are respectively similar to 50 and similar to 120 times greater than those of conventional metallic strain sensors.
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