Figure 3 | Scientific Reports

Figure 3

From: Self-adhesive epidermal carbon nanotube electronics for tether-free long-term continuous recording of biosignals

Figure 3

Electrical properties of CNT/aPDMS.

(a) Schematic diagram of the impedance from the heart to the preamplifier, which is composed of the impedance from the heart to the epidermis (ZHE), the contact impedance between CNT/aPDMS and the epidermis (ZCE), the intrinsic impedance of CNT/aPDMS (ZC) and the contact impedance between CNT/aPDMS and the metal-patterned layer (ZCM). (b) The conductivity of ZC increases as the concentration of CNTs increases. (c) ZCM is also resistive and its impedance decreases with the concentration of CNTs. (d) ZCE is much higher than the other impedances between the heart and the amplifier. The impedance of the dry electrode is the highest and that of the Ag/AgCl electrode is the lowest.

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