Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 23, Pages 19955-19962Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02988
Keywords
sensor; spider inspired; single-walled carbon nanotubes; Au film; human health monitoring
Funding
- National Nature Science Foundation of China [11174227, 11504276, 11547310]
- Specialized Research Fund for the Doctoral Program [20130141120079]
- Ministry of Science and Technology of the People's Republic of China [2014GB109004]
- National Science Foundation of Hubei Province, China [ZRY2014000988]
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Sensitivity, durability, and multifunction are the essential requirements for a high-performance wearable sensor. Here, we report a novel multifunctional sensor with high sensitivity and durability by using a buckled spider silk-like single-walled carbon nanotubes (SSL-SWNTs) film as the conducting network and a crack-shaped Au film as the sensitive transducer. Its high sensitivity is inspired by the crack-shaped structure of the spiders slit organs, while the high durability is inspired by the mechanical robustness of the spider silk. Similar to the spiders slit organs that can detect slight vibrations, our sensor also exhibits a high sensitivity especially to tiny strain. The proposed quantum tunneling model is consistent with experimental data. In addition, this sensor also responds sensitively to temperature with the sensitivity of 1.2%/degrees C. Because of the hierarchical structure like spider silk, this sensor possesses combined superiority of fast response (<60 ms) and high durability (>10 000 cycles). We also fabricate a wearable device for monitoring various human physiological signals. It is expect that this high-performance sensor will have wide potential applications in intelligent devices, fatigue detection, body monitoring, and humanmachine interfacing.
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