PEDOT: PSS/EG/LiTFSI conductive ink, super-flexible electrode and electrophysiological signal monitoring method

A conductive ink, ultra-flexible technology, applied in diagnostic recording/measurement, ink, medical science, etc., can solve the problems of low conductivity and stretchability, achieve improved conductivity and stretchability, and good printing effect Effect

Pending Publication Date: 2022-06-03
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent "core-shell" microstructure of PEDOT:PSS in the intrinsic state (wherein the hydrophobic PEDOT tends to form a curly "core", and the hydrophilic PSS wraps outside the PEDOT to form a "shell"), the electrical conductivity and The stretchability is low, which limits its application to a large extent

Method used

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  • PEDOT: PSS/EG/LiTFSI conductive ink, super-flexible electrode and electrophysiological signal monitoring method
  • PEDOT: PSS/EG/LiTFSI conductive ink, super-flexible electrode and electrophysiological signal monitoring method
  • PEDOT: PSS/EG/LiTFSI conductive ink, super-flexible electrode and electrophysiological signal monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The present embodiment provides a method for modifying PEDOT:PSS with ethylene glycol and lithium bistrifluoromethanesulfonimide to obtain a PEDOT:PSS / EG / LiTFSI solution, which comprises the following steps:

[0070] 1) Prepare PEDOT:PSS / 5wt%EG / 10wt%LiTFSI solution

[0071] On the basis of the PEDOT:PSS / 5wt%EG solution prepared in Comparative Example 1, LiTFSI was added to make it account for 10wt% of the solid content of PEDOT:PSS, and the stirring was carried out. The stirring speed was 900r / min, and the stirring time was 15min. The PEDOT:PSS / 5wt%EG / 10wt%LiTFSI solution can be obtained.

[0072] 2) Viscosity test

[0073] The viscosity of the PEDOT:PSS / 5wt%EG / 10wt%LiTFSI solution was tested with a digital viscometer, and the viscosity was 23.8cP.

[0074] 3) Surface tension test

[0075] The surface tension of the PEDOT:PSS / 5wt%EG / 10wt%LiTFSI solution was tested with a surface tensiometer, and the surface tension was 36.7 mN / m.

[0076] 4) Preparation of flexible ...

Embodiment 2

[0082] The present embodiment provides a method for modifying PEDOT:PSS with ethylene glycol and lithium bistrifluoromethanesulfonimide to obtain a PEDOT:PSS / EG / LiTFSI solution, which comprises the following steps:

[0083] 1) Preparation of PEDOT:PSS / 5wt%EG / 20wt%LiTFSI solution

[0084] The addition amount of LiTFSI was changed to account for 20wt% of the total system, and other steps were the same as in Comparative Example 1.

[0085] 2) Viscosity test

[0086] The viscosity of the PEDOT:PSS / 5wt%EG / 20wt%LiTFSI solution was tested with a digital viscometer, and the viscosity was 20.2cP.

[0087] 3) Surface tension test

[0088] The surface tension of the PEDOT:PSS / 5wt%EG / 20wt%LiTFSI solution was tested with a surface tensiometer, and the surface tension was 35.5 mN / m.

[0089] 4) Preparation of flexible self-supporting PEDOT:PSS / 5wt%EG / 20wt%LiTFSI films

[0090] The preparation process is the same as in Example 1.

[0091] 5) Conductivity test

[0092] The conductivity ...

Embodiment 3

[0094] The present embodiment provides a method for modifying PEDOT:PSS with ethylene glycol and lithium bistrifluoromethanesulfonimide to obtain a PEDOT:PSS / EG / LiTFSI solution, which comprises the following steps:

[0095] 1) Prepare PEDOT:PSS / 5wt%EG / 30wt%LiTFSI solution

[0096] The addition amount of LiTFSI was changed to account for 30wt% of the total system, and other steps were the same as those in Example 1.

[0097] 2) Viscosity test

[0098] The viscosity of the PEDOT:PSS / 5wt%EG / 30wt%LiTFSI solution was measured by a digital viscometer, and the viscosity was 18.7cP.

[0099] 3) Surface tension test

[0100] The surface tension of the PEDOT:PSS / 5wt%EG / 30wt%LiTFSI solution was tested with a surface tensiometer, and the surface tension was 34.2 mN / m.

[0101] 4) Preparation of flexible self-supporting PEDOT:PSS / 5wt%EG / 30wt%LiTFSI films

[0102] The preparation process is the same as in Example 1.

[0103] 5) Conductivity test

[0104] The conductivity of PEDOT:PSS / 5w...

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Abstract

The invention provides PEDOT: PSS/EG/LiTFSI (poly (3, 4-ethylenedioxythiophene): PSS/EG/LiTFSI) conductive ink, an ultra-flexible electrode and a monitoring method of an electrophysiological signal. The PEDOT: PSS/EG/LiTFSI conductive ink is obtained by modifying a PEDOT: PSS solution with ethylene glycol and LiTFSI, the viscosity of the PEDOT: PSS/EG/LiTFSI conductive ink is 1-1000 cP, the surface tension of the PEDOT: PSS/EG/LiTFSI conductive ink is 30-40 mN/m, and the properties of the PEDOT: PSS/EG/LiTFSI conductive ink are not obviously changed after the PEDOT: PSS/EG/LiTFSI conductive ink is placed at room temperature for a long time for 60 days. The total thickness of the super-flexible electrode is as low as 600 nanometers, and the super-flexible electrode is prepared from the conductive ink through an aerosol jet printing technology. The ultrathin flexible electrode with high conductivity and high stretchability can be prepared by controlling the proportion of PEDOT: PSS, EG and LiTFSI, and the resistance of the ultrathin flexible electrode presents a negative growth trend within a 30% strain range.

Description

technical field [0001] The invention relates to a PEDOT:PSS / EG / LiTFSI conductive ink, an ultra-flexible electrode and a monitoring method for electrophysiological signals, belonging to the technical field of conductive polymer materials. Background technique [0002] The human body will generate health-related electrophysiological signals (ECG, EMG, EEG, EMG, etc.) during physiological activities. Accurate, real-time, and continuous acquisition of these signals has important application value in the field of human health monitoring. Wearable electrodes are important devices for real-time monitoring of electrophysiological signals. At present, Ag / AgCl gel electrodes are commonly used in clinical practice, but long-term wearing is prone to problems such as signal attenuation, skin irritation and poor stability. Flexible dry electrodes can be in close contact with the skin and exhibit comparable performance to gel electrodes, which has become a current research hotspot. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/52C09D11/03C09D11/106C09D11/102A61B5/25A61B5/268
CPCC09D11/52C09D11/03C09D11/106C09D11/102A61B5/25A61B5/268
Inventor 徐晓敏魏斌斌成会明
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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