Antifreeze Polyvinyl Alcohol Organohydrogel Sensors Containing Polypyrrole Nanowires Self-Assembled onto Graphene Oxide Nanoplatelets with High Electrical Conductivity and Improved Mechanical Properties

被引：0

作者：

Yang, Pengcheng ^{[1
,2
]}

Bai, Junwei ^{[3
]}

Olivieri, Federico ^{[1
]}

Santillo, Chiara ^{[4
]}

Castaldo, Rachele ^{[1
]}

Gentile, Gennaro ^{[1
]}

Zhang, Junhua ^{[5
]}

Lavorgna, Marino ^{[4
]}

Buonocore, Giovanna G. ^{[4
]}

机构：

[1] Natl Council Res Italy, Inst Polymers Composites & Biomat, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy

[2] Politecn Torino, Dipartimento Sci Applicata & Tecnol DISAT, Corso Duca Abruzzi 24, I-10129 Turin, Italy

[3] China Bluestar Chengrand Chem Co Ltd, Chengdu 610041, Peoples R China

[4] Natl Council Res Italy, Inst Polymers Composites & Biomat, Ple E Fermi 1, I-80155 Portici, NA, Italy

[5] Sichuan Univ, Polymer Res Inst, State Key Lab Polymer Mat Engn, Chengdu 610065, Peoples R China

来源：

ADVANCED MATERIALS TECHNOLOGIES | 2025年 / 10卷 / 02期

关键词：

GO; organohydrogel; polyvinyl alcohol; PPy nanowires; sensor; HYDROGEL; COMPOSITES; STRAIN;

D O I：

10.1002/admt.202400970

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Conductive hydrogels exhibit significant potential for flexible electronics owing to their exceptional flexibility, resistance to deformation, and high conductivity. However, there is a critical need to develop hydrogels that can withstand extremely low temperatures while exhibiting good mechanical properties. In this study, carboxyl-modified polyvinyl alcohol (PVA) as the gel matrix, dimethylsulfoxide and water as a mixed solvent solution, and graphene oxide (GO) assembled polypyrrole (PPy) nanowires are used to prepare a new type of antifreeze conductive organohydrogel (PGOPPy). The PGOPPy organohydrogel demonstrates outstanding antifreeze properties, retaining its flexibility at temperatures as low as -75 degrees C. It exhibits a fracture strength of 0.80 MPa and an elongation at break of 436% at room temperature. Remarkably, after being stored at room temperature for 15 days, the diameter of the PGOPPy organohydrogel changes only by 4%. Moreover, PGOPPy shows high electrical conductivity, up to 1.07 S m-1, and exhibits variable conductivity in response to mechanical deformation, with a stable response over cyclic deformations, allowing its use as a sensor to monitor body movements. Results demonstrate that the developed material is very promising as an effective sensor technology for use in extremely cold environments. Moreover, this work provides a general method for preparing antifreeze organhydrogels using water and dimethylsulfoxide as mixed solvents. New organohydrogels based on polyvinyl alcohol/water/dimethylsulfoxide and containing polypyrrole nanowires-modified graphene oxide show antifreeze properties, retaining their flexibility at temperatures as low as -75 degrees C, and display high electrical conductivity and stable electrical response to cyclic deformation, allowing their application as movement sensors in extremely cold environments. image

引用

页数：10