10.1021/acsami.9b21659.s001
Zhihui Qin
Zhihui
Qin
Xia Sun
Xia
Sun
Qingyu Yu
Qingyu
Yu
Haitao Zhang
Haitao
Zhang
Xiaojun Wu
Xiaojun
Wu
Mengmeng Yao
Mengmeng
Yao
Wenwen Liu
Wenwen
Liu
Fanglian Yao
Fanglian
Yao
Junjie Li
Junjie
Li
Carbon
Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable,
Highly Sensitive, Stable Strain, and Pressure Sensors
American Chemical Society
2020
conductive hydrogel
fatigue resistance
hydrogel network
anti-fatigue conductive nanocomposite hydrogel
pressure sensors
strain sensitivity
hydrogel-based sensors
carbon nanotubes
MJ
anti-fatigue property
Pressure Sensors Conductive hydrogels
amphiphilic sodium dodecyl sulfate
gauge factor
large-pressure region
skin-like sensors
uniform dispersion
wearable strain
CNT surface
hydrogel matrix
Stable Strain
strain ranges
2020-01-17 16:40:07
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Carbon_Nanotubes_Hydrophobically_Associated_Hydrogels_as_Ultrastretchable_Highly_Sensitive_Stable_Strain_and_Pressure_Sensors/11638239
Conductive hydrogels
have become one of the most promising materials for skin-like sensors
because of their excellent biocompatibility and mechanical flexibility.
However, the limited stretchability, low toughness, and fatigue resistance
lead to a narrow sensing region and insufficient durability of the
hydrogel-based sensors. In this work, an extremely stretchable, highly
tough, and anti-fatigue conductive nanocomposite hydrogel is prepared
by integrating hydrophobic carbon nanotubes (CNTs) into hydrophobically
associated polyacrylamide (HAPAAm) hydrogel. In this conductive hydrogel,
amphiphilic sodium dodecyl sulfate was used to ensure uniform dispersion
of CNTs in the hydrogel network, and hydrophobic interactions between
the hydrogel matrix and the CNT surface formed, greatly improving
the mechanical properties of the hydrogel. The obtained CNTs/HAPAAm
hydrogel showed excellent stretchability (ca. 3000%), toughness (3.42
MJ m<sup>–3</sup>), and great anti-fatigue property. Moreover,
it exhibits both high tensile strain sensitivity in the wide strain
ranges (gauge factor = 4.32, up to 1000%) and high linear sensitivity
(0.127 kPa<sup>–1</sup>) in a large-pressure region within
0–50 kPa. The CNTs/HAPAAm hydrogel-based sensors can sensitively
and stably detect full-range human activities (e.g., elbow rotation,
finger bending, swallowing motion, and pronouncing) and handwriting,
demonstrating the CNTs/HAPAAm hydrogel’s potential as the wearable
strain and pressure sensors for flexible devices.