Notice of retraction
Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Published in advance: November 5, 2020

Robust Fluidic Biocompatible Strain Sensor Based on PEDOT:PSS/CNT Composite for Human-wearable and High-end Robotic Applications [PDF]

Faiza Jabbar, Afaque Manzoor Soomro, Jae-wook Lee, Muhsin Ali, Young Su Kim, Sang-ho Lee, and Kyung Hyun Choi

(Received September 9, 2020; Accepted October 23, 2020)

Keywords: fluidic strain sensor, robotics, wearable electronics, biocompatibility

A robust fluidic strain sensor based on a biocompatible conductive poly(3,4-ethylenedioxythiophene) polystyrene sulfonate multiwall carbon nanotube (PEDOT:PSS/MWCNT) liquid is proposed. A simple fabrication process is followed by the 3D printing of a 2.5 cycle sinusoidal channel, and the infiltration liquid is infilled using custom-made automated pumping syringes. The sensor showed a highly linear response (R2 = 0.9935), a minimal hysteresis (1.56%), a gauge factor (GF) of 89.4, and a two-order change in resistance up to 150% strain. The device was tested for 1000 cycles at 30% strain and showed the ability to follow the applied strain up to a maximum frequency of 10 Hz. Moreover, the device showed a significantly stable response under the full humidity range (0–100% RH) and at temperatures from 20 to 40 ℃. As a proof-of-concept demonstration, the fabricated sensor was used with a robotic leg as a high-end feedback sensor. Furthermore, the biocompatibility of the device was confirmed before its applications in wearable electronics by the cell viability assessment of human epidermal keratinocytes (HEKp) and human umbilical cord vascular endothelial cells (HUVEC). The simple fabrication process and ultrahigh sensitivity of the device make it a robust candidate for wearable and robotic applications.

Corresponding author: Kyung Hyun Choi

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