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High-strength flexible self-supporting electromagnetic shielding thin film and preparation method thereof

An electromagnetic shielding and self-supporting technology, applied in the direction of magnetic/electric field shielding, shielding materials, electrical components, etc., can solve the problems of reduced electrical conductivity, etc., and achieve the effect of enhancing mechanical strength, wide practical application prospects, and enhancing electronic transmission

Active Publication Date: 2019-02-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gogotsi et al. from Drexel University in the United States used polyvinyl alcohol to enhance Ti 3 C 2 MXene, the tensile strength at break increased from 22MPa to 91MPa, but the electrical conductivity decreased by 10 times

Method used

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  • High-strength flexible self-supporting electromagnetic shielding thin film and preparation method thereof
  • High-strength flexible self-supporting electromagnetic shielding thin film and preparation method thereof
  • High-strength flexible self-supporting electromagnetic shielding thin film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In this example, see figure 1 , a high-strength flexible self-supporting electromagnetic shielding film, using the adhesion of polydopamine PDA to load silver nanowires AgNWs on nanocellulose NFC to obtain polydopamine-modified conductive fibers in the form of AgNWs@PDA-NFC; and Through the synergistic intercalation of conductive fibers, the bulk Ti 3 C 2 The lamella in the layer is peeled off, increasing the Ti 3 C 2 The intercalation rate and interlayer spacing can be used to obtain Ti with a single layer and a few layers of 2-10 layers 3 C 2 MXene nanosheets; finally, through the electrostatic interaction of positive and negative charges and hydrogen bonding, the one-dimensional AgNWs@PDA-NFC conductive cellulose and the two-dimensional Ti 3 C 2 MXene nanosheets are constructed to form a three-dimensional conductive network with a "brick-mud" structure, which is assembled in one step through the filter press method to form a flexible electromagnetic shielding f...

Embodiment 2

[0031] This embodiment is basically the same as Embodiment 1, especially in that:

[0032] In this example, a high-strength flexible self-supporting electromagnetic shielding film uses the adhesion of polydopamine PDA to load silver nanowires AgNWs on nanocellulose NFC to obtain polydopamine-modified polydopamine in the form of AgNWs@PDA-NFC conductive fibers; and through the synergistic intercalation of conductive fibers, the bulk Ti 3 C 2 The lamella in the layer is peeled off, increasing the Ti 3 C 2 The intercalation rate and interlayer spacing can be used to obtain Ti with a single layer and a few layers of 2-10 layers 3 C 2 MXene nanosheets; finally, through the electrostatic interaction of positive and negative charges and hydrogen bonding, the one-dimensional AgNWs@PDA-NFC conductive cellulose and the two-dimensional Ti 3 C 2 MXene nanosheets are constructed to form a three-dimensional conductive network with a "brick-mud" structure, which is assembled in one ste...

Embodiment 3

[0041] This embodiment is basically the same as the previous embodiment, and the special features are:

[0042] In this example, a high-strength flexible self-supporting electromagnetic shielding film uses the adhesion of polydopamine PDA to load silver nanowires AgNWs on nanocellulose NFC to obtain polydopamine-modified polydopamine in the form of AgNWs@PDA-NFC conductive fibers; and through the synergistic intercalation of conductive fibers, the bulk Ti 3 C 2 The lamella in the layer is peeled off, increasing the Ti 3 C 2 The intercalation rate and interlayer spacing can be used to obtain Ti with a single layer and a few layers of 2-10 layers 3 C 2 MXene nanosheets; finally, through the electrostatic interaction of positive and negative charges and hydrogen bonding, the one-dimensional AgNWs@PDA-NFC conductive cellulose and the two-dimensional Ti 3 C 2 MXene nanosheets are constructed to form a three-dimensional conductive network with a "brick-mud" structure, which is...

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Abstract

The invention discloses a high-strength flexible self-supporting electromagnetic shielding thin film and a preparation method thereof. Silver nanowires are loaded on nanocellulose through an adhesionaction of polydopamine to obtain high-conductivity polydopamine modified nanocellulose conductive fibers; the sheet layer of two-dimensional Ti3C2 is stripped for the first time through the effect ofan auxiliary intercalation layer of the conductive fibers, so that the intercalation rate and the interlayer spacing are improved, and a single layer or a few layers of 2-10 layers of Ti3C2MXene nanosheets can be obtained; meanwhile, one-dimensional conductive fibers and the two-dimensional nanosheets are self-assembled into a three-dimensional "brick-mud"-structured conductive network through anelectrostatic effect of positive and negative charges and a hydrogen bond effect; and finally, the flexible electromagnetic shielding thin film is synthesized in one step through a high-pressure pressing and filtering method. The flexible self-supporting thin film prepared by the method has the characteristics of being remarkable in electromagnetic wave shielding effect, high in mechanical strength, high in bending flexibility and simple in synthetic process, and can meet the specific requirements of the flexible electronics in actual application.

Description

technical field [0001] The invention relates to an electromagnetic shielding film and a preparation method thereof, in particular to a flexible electromagnetic shielding film and a preparation method thereof, which are applied in the technical field of electromagnetic shielding materials. Background technique [0002] Electromagnetic interference and electromagnetic radiation cause serious harm to portable electronics, aerospace and national defense safety and human health. Traditional electromagnetic shielding materials represented by metals are difficult to meet the needs of the development of lightweight and portable electronic products due to their shortcomings such as high density, poor flexibility, and easy corrosion. In recent years, MXene, as a new type of two-dimensional layered transition metal carbon / nitride, has excellent metal conductivity (conductivity up to 65000 S / m) and ferromagnetism, and has become an ideal electromagnetic shielding material. The shortcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081H05K9/009
Inventor 苗苗刘瑞婷施利毅冯欣曹绍梅
Owner SHANGHAI UNIV
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