Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 9, Pages 10908-10917Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b18069
Keywords
optical strain sensor; stretchable sensor; carbon nanotube; wearable sensor; elastomer composite
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2018R1A2B2004910]
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2015R1A5A1037668]
- National Research Foundation of Korea [2015R1A5A1037668, 2018R1A2B2004910] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A number of flexible and stretchable strain sensors based on piezoresistive and capacitive principles have been recently developed. However, piezoresistive sensors suffer from poor long-term stability and considerable hysteresis of signals. On the other hand, capacitive sensors exhibit limited sensitivity and strong electromagnetic interference from the neighboring environment. In order to resolve these problems, a novel stretchable strain sensor based on the modulation of optical transmittance of carbon nanotube (CNT)-embedded Ecoflex is introduced in this paper. Within the film of multiwalled CNTs embedded in the Ecoflex substrate, the microcracks are propagated under tensile strain, changing the optical transmittance of the film. The proposed sensor exhibits good stretchability (epsilon approximate to 400%), high linearity (R-2 > 0.98) in the strain range of epsilon approximate to 0-100%, excellent stability, high sensitivity (gauge factor approximate to 30), and small hysteresis (similar to 1.8%). The sensor was utilized to detect the bending of the finger and wrist for the control of a robot arm. Furthermore, the applications of this sensor to the real-time posture monitoring of the neck and to the detection of subtle human motions were demonstrated.
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