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Adv Mater. 2018 Oct;30(43):e1803388. doi: 10.1002/adma.201803388. Epub 2018 Sep 14.

Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity.

Author information

1
Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 37673, Korea.
2
Nano Carbon Materials Research Group, Creative and Fundamental Research Division, Korea Electrotechnology Research Institute, Changwon, 642-120, Korea.
3
Department of Creative IT Engineering, Pohang University of Science and Technology, Pohang, 37673, Korea.

Abstract

Human skin imperfectly discriminates between pressure and temperature stimuli under mixed stimulation, and exhibits nonlinear sensitivity to each stimulus. Despite great advances in the field of electronic skin (E-skin), the limitations of human skin have not previously been overcome. For the first time, the development of a stimulus-discriminating and linearly sensitive bimodal E-skin that can simultaneously detect and discriminate pressure and temperature stimuli in real time is reported. By introducing a novel device design and using a temperature-independent material, near-perfect stimulus discriminability is realized. In addition, the hierarchical contact behavior of the surface-wrinkled microstructure and the optimally reduced graphene oxide in the E-skin contribute to linear sensitivity to applied pressure/temperature stimuli over wide intensity range. The E-skin exhibits a linear and high pressure sensitivity of 0.7 kPa-1 up to 25 kPa. Its operation is also robust and exhibits fast response to pressure stimulus within 50 ms. In the case of temperature stimulus, the E-skin shows a linear and reproducible temperature coefficient of resistance of 0.83% K-1 in the temperature range 22-70 °C and fast response to temperature change within 100 ms. In addition, two types of stimuli are simultaneously detected and discriminated in real time by only impedance measurements.

KEYWORDS:

bimodal electronic skin; linear sensitivity; stimulus discriminability; wearable sensor

PMID:
30216564
DOI:
10.1002/adma.201803388
[Indexed for MEDLINE]

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