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Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors.
ACS Appl Mater Interfaces. 2020 Jan 29; 12(4):4944-4953.AA

Abstract

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-3), 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-1) 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.

Authors+Show Affiliations

School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China. School of Materials Science and Engineering , East China Jiaotong University , Nanchang 330013 , China. Key Laboratory of Systems Bioengineering (Ministry of Education) , Tianjin University , Tianjin 300350 , China.School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , China. Key Laboratory of Systems Bioengineering (Ministry of Education) , Tianjin University , Tianjin 300350 , China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31912722

Citation

Qin, Zhihui, et al. "Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors." ACS Applied Materials & Interfaces, vol. 12, no. 4, 2020, pp. 4944-4953.
Qin Z, Sun X, Yu Q, et al. Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors. ACS Appl Mater Interfaces. 2020;12(4):4944-4953.
Qin, Z., Sun, X., Yu, Q., Zhang, H., Wu, X., Yao, M., Liu, W., Yao, F., & Li, J. (2020). Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors. ACS Applied Materials & Interfaces, 12(4), 4944-4953. https://doi.org/10.1021/acsami.9b21659
Qin Z, et al. Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors. ACS Appl Mater Interfaces. 2020 Jan 29;12(4):4944-4953. PubMed PMID: 31912722.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Carbon Nanotubes/Hydrophobically Associated Hydrogels as Ultrastretchable, Highly Sensitive, Stable Strain, and Pressure Sensors. AU - Qin,Zhihui, AU - Sun,Xia, AU - Yu,Qingyu, AU - Zhang,Haitao, AU - Wu,Xiaojun, AU - Yao,Mengmeng, AU - Liu,Wenwen, AU - Yao,Fanglian, AU - Li,Junjie, Y1 - 2020/01/17/ PY - 2020/1/9/pubmed PY - 2020/6/11/medline PY - 2020/1/9/entrez KW - carbon nanotubes KW - high strength KW - hydrophobic association KW - nanocomposite hydrogel KW - skin-like sensor SP - 4944 EP - 4953 JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces VL - 12 IS - 4 N2 - 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-3), 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-1) 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. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/31912722/Carbon_Nanotubes/Hydrophobically_Associated_Hydrogels_as_Ultrastretchable_Highly_Sensitive_Stable_Strain_and_Pressure_Sensors_ DB - PRIME DP - Unbound Medicine ER -