An ultra-soft conductive elastomer for multifunctional tactile sensors with high range and sensitivity

被引：9

作者：

Yin, Ao ^{[1
,2
]}

Chen, Ruiguang ^{[1
,2
]}

Yin, Rui ^{[1
,2
]}

Zhou, Shiqiang ^{[1
,2
]}

Ye, Yang ^{[1
,2
]}

Wang, Yuxin ^{[1
,2
]}

Wang, Peike ^{[1
,2
]}

Qi, Xue ^{[1
,2
]}

Liu, Haipeng ^{[1
,2
]}

Liu, Jiang ^{[1
,2
]}

Yu, Suzhu ^{[1
,2
]}

Wei, Jun ^{[1
,2
,3
]}

机构：

[1] Harbin Inst Technol Shenzhen, Shenzhen Key Lab Flexible Printed Elect Technol, Shenzhen 518055, Peoples R China

[2] Harbin Inst Technol Shenzhen, Sch Mat Sci & Engn, Shenzhen 518055, Peoples R China

[3] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China

来源：

MATERIALS HORIZONS | 2024年 / 11卷 / 08期

基金：

中国国家自然科学基金;

关键词：

FLEXIBLE PRESSURE SENSORS; ELECTRICAL DOUBLE-LAYER;

D O I：

10.1039/d3mh02074f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Flexible tactile sensors have become important as essential tools for facilitating human and object interactions. However, the materials utilized for the electrodes of capacitive tactile sensors often cannot simultaneously exhibit high conductivity, low modulus, and strong adhesiveness. This limitation restricts their application on flexible interfaces and results in device failure due to mechanical mismatch. Herein, we report an ultra-low modulus, highly conductive, and adhesive elastomer and utilize it to fabricate a microstructure-coupled multifunctional flexible tactile sensor. We prepare a supramolecular conductive composite film (SCCF) as the electrode of the tactile sensor using a supramolecular deep eutectic solvent, polyvinyl alcohol (PVA) solution, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), and MXene suspension. We employ a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) film containing 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM:TFSI) as the dielectric layer to fabricate capacitive sensors with an electrical double layer structure. Furthermore, we enhance the performance of the device by incorporating coupled pyramid and dome microstructures, which endow the sensor with multi-directional force detection. Our SCCF exhibits extremely high conductivity (reaching 710 S cm(-1)), ultra-low modulus (0.8 MPa), and excellent interface adhesion strength (>120 J m(-2)). Additionally, due to the outstanding conductivity and unique structure of the SCCF, it possesses remarkable electromagnetic shielding ability (>50 dB). Moreover, our device demonstrates a high sensitivity of up to 1756 kPa(-1) and a wide working range reaching 400 kPa, combining these attributes with the requirements of an ultra-soft human-machine interface to ensure optimal contact between the sensor and interface materials. This innovative and flexible tactile sensor holds great promise and potential for addressing various and complex demands of human-machine interaction.

引用

页码：1975 / 1988

页数：14