Issue 36, 2024

A polyacrylamide/gelatin/tannic acid-modified carbon nanotube double network hydrogel with skin temperature-triggered adhesion and high sensitivity for wearable sensors

Abstract

Flexible wearable devices based on conductive hydrogels have received widespread attention. However, the poor mechanical properties, weak adhesion and low sensitivity of traditional hydrogels greatly limit their practical applications. In this study, a polyacrylamide/gelatin/tannic acid-modified carbon nanotube (PAM/gelatin/TA-CNT) double network conductive hydrogel with skin temperature-triggered adhesion and low-temperature-triggered detachment was constructed via a simple one-pot method using polyacrylamide (PAM) and gelatin as the main components, and tannic acid (TA)-modified carbon nanotubes (CNTs) as the conductive filler. The resulting hydrogel has various functions such as excellent mechanical properties, high sensitivity (GF value was 5.50), wide strain detection range and excellent fatigue resistance. Flexible strain sensors based on this hydrogel can provide real-time and stable monitoring of human physiological activities over a wide strain range. In addition, its assembly into a pressure sensor can also realize information encryption and transmission.

Graphical abstract: A polyacrylamide/gelatin/tannic acid-modified carbon nanotube double network hydrogel with skin temperature-triggered adhesion and high sensitivity for wearable sensors

Supplementary files

Article information

Article type
Paper
Submitted
09 Upu 2024
Accepted
31 Upu 2024
First published
01 Pha 2024

J. Mater. Chem. C, 2024,12, 14330-14342

A polyacrylamide/gelatin/tannic acid-modified carbon nanotube double network hydrogel with skin temperature-triggered adhesion and high sensitivity for wearable sensors

W. Liu, K. Wang, Z. Zhao, J. Yan, C. Zhang, S. Ma, J. Wang, W. Guo and J. Wang, J. Mater. Chem. C, 2024, 12, 14330 DOI: 10.1039/D4TC02900C

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