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Preparation method of layer-by-layer self-assembled semiconductor fiber and transistor sensor

A layer-by-layer self-assembly and semiconductor technology, which is applied in fiber processing, plant fiber, ultrasonic/sonic fiber processing, etc., can solve the problems of poor transistor performance, poor cycle stability, and low transconductance, and achieve convenient and excellent detection Effect of selectivity, sensitivity, and low detection limit

Active Publication Date: 2022-01-07
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that the performance of the transistor prepared by the conductive fiber obtained by this method is not as good as that of the transistor prepared by the present invention, and there are problems such as low transconductance and poor cycle stability.

Method used

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  • Preparation method of layer-by-layer self-assembled semiconductor fiber and transistor sensor
  • Preparation method of layer-by-layer self-assembled semiconductor fiber and transistor sensor
  • Preparation method of layer-by-layer self-assembled semiconductor fiber and transistor sensor

Examples

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preparation example Construction

[0044] A method for preparing a layer-by-layer self-assembled semiconductor fiber provided by the invention comprises the following steps:

[0045] S1. Prepare an aqueous solution comprising polydiallyldimethylammonium chloride as an electropositive solution, and prepare a mixed solution comprising PEDOT:PSS and multi-walled carbon nanotubes as an electronegative solution;

[0046] The concentration of polydiallyl dimethyl ammonium chloride in the electropositive solution is 0.5~0.75wt%; In the electronegative solution, the concentration of PEDOT:PSS is 1.0~1.3wt%, and the concentration of multi-walled carbon nanotubes is 0.3-0.6wt%. The multi-walled carbon nanotubes are preferably hydroxylated multi-walled carbon nanotubes. The research results of the present invention show that the semiconductor fiber obtained by combining positive and negative electrolytic solutions under this condition is used for the preparation of organic electrochemical transistors and has optimal sens...

Embodiment 1

[0061] A method for preparing a layer-by-layer self-assembled fiber bundle-based organic electrochemical transistor biosensor, comprising the following steps:

[0062] a. Take a section of cotton fiber and carry out surface decontamination treatment, and carry out 1200s of oxygen plasma treatment to obtain a modified fiber bundle;

[0063] b. Dissolving the electropositive material PDDA (polydiallyldimethylammonium chloride) in water is prepared into a 0.5wt% electropositive dispersion, PEDOT:PSS (poly(3,4-ethylenedioxy Base thiophene)-poly(styrene sulfonic acid)) concentration is 1wt%, MWCNTs (hydroxylated multi-walled carbon nanotube) concentration is 0.5wt% PEDOT:PSS-MWCNTs composite dispersion liquid as electronegative dispersion liquid, step a The prepared fiber bundles were repeatedly soaked in a certain concentration of electropositive and electronegative dispersions for 10 minutes each, and the composite conductive fiber bundles were obtained by the layer-by-layer self...

Embodiment 2-4

[0083] Compared with Example 1, Examples 2-4 are different in that, in step b, the concentrations of PDDA, PEDOT:PSS, and MWCNTs dispersion are as shown in Table 1, and the others are approximately the same as in Example 1, and are not repeated here. repeat.

[0084] The preparation conditions of table 1 embodiment 2-4

[0085]

[0086] Since PDDA is an electropositive layer and is wrapped by an electronegative layer, its concentration has no significant impact on the performance of fibers and FECT. However, the decrease of the concentration of PEDOT:PSS will reduce the film-forming property, which will affect the conductivity of the composite fiber and the electrochemical performance of FECT. When the concentration of MWCNTs increases, it is more likely to cause the agglomeration of MWCNTs on the surface of the fiber, which affects the conductivity of the composite fiber and the electrochemical performance of FECT.

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Abstract

The invention provides a preparation method of layer-by-layer self-assembled semiconductor fiber and a transistor sensor. According to the layer-by-layer self-assembled semiconductor fiber, a fiber base material subjected to plasma treatment is circularly and alternately adsorbed in a poly(diallyldimethylammonium chloride) aqueous solution and a mixed solution of PEDOT:PSS and multi-walled carbon nanotubes in sequence, so that the n-layer self-assembled semiconductor fiber is prepared. The organic electrochemical transistor biosensor is formed by assembling the semiconductor fiber as a source and drain electrode and conductive fiber impregnated and adsorbed with a substance with a specific recognition effect as a grid electrode, so that the amplification function, sensing stability and sensitivity of a transistor can be improved, and the organic electrochemical transistor biosensor can be applied to various wearable electronic sensing fields.

Description

technical field [0001] The invention relates to the technical field of organic electrochemical transistors, in particular to a method for preparing layer-by-layer self-assembled semiconductor fibers and a transistor sensor. Background technique [0002] Transistors are important building blocks of electronic devices and have been widely used in the development of various sensors including electrical and chemical sensors. Among the different types of transistor-based sensors, electrochemical transistors (ECTs) have been favored due to their simple and inexpensive fabrication, mechanical flexibility, and suitability for miniaturization relative to conventional transistors such as field-effect transistors (FETs), received special attention. Organic materials such as conducting polymers have been used to develop organic electrochemical transistors (OECTs), which facilitates the application of OECTs in the fields of biological and chemical sensing. [0003] The detection mechan...

Claims

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Application Information

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IPC IPC(8): D06M15/356D06M15/37D06M15/233D06M11/74D06M10/02D06M101/06
CPCD06M15/3562D06M15/37D06M15/233D06M11/74D06M10/025D06M2101/06
Inventor 王跃丹王栋朱如枫陶洋李沐芳陈媛丽
Owner WUHAN TEXTILE UNIV
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