Carbon material-polymer strain sensitive film and its preparation method

Patent metadata

Field	Value
Publication number	US-10550240-B2
Application number	US-201715825109-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Feb 13, 2017
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A carbon material-polymer strain sensitive film and its preparation method are disclosed. The carbon material-polymer strain sensitive film includes multiple layers of carbon sensitive films and multiple layers of polymer films, wherein the multiple layers of carbon sensitive films and the multiple layers of polymer films form a multi-layer composite film in sequence through a layer-by-layer assembly process. The preparation method includes steps of: cleaning, processing a hydrophilic treatment and processing a hydrophobic treatment on a rigid substrate in sequence; preparing a carbon material in dispersion solution and a polymer dispersion solution; through a layer-by-layer self-assembly process, growing the polymer and the carbon material in a form of layer-by-layer on the rigid substrate; transferring the composite film from the rigid substrate to a flexible substrate; and pasting two electrodes at two ends of the composite film and encapsulating with a flexible film.

First claim

What is claimed is:

1. A carbon material-polymer strain sensitive film comprising: multiple layers of carbon films and multiple layers of polymer films, wherein: the multiple layers of carbon films and multiple layers of polymer films form a multi-layer composite film in sequence through a layer-by-layer assembly process;
the polymer films are made from a material which is soluble in water or alcohol; and
the polymer films are made from polyethyleneimine (PEI), polyacrylamide (PAAM), or polyvinylpyrrolidone (PVP).

2. A preparation method of a carbon material-polymer strain sensitive film comprising steps of:
(1) cleaning, processing a hydrophilic treatment and processing a hydrophobic treatment on a surface of a rigid substrate in sequence;
(2) preparing a carbon material dispersion solution with uniform dispersion and preparing a polymer dispersion solution with uniform dispersion;
(3) after the step (1), sequentially and repeatedly immersing the rigid substrate into the polymer dispersion solution and the carbon material dispersion solution, and preparing a multi-layer composite film on the rigid substrate through a layer-by-layer assembly process;
(4) transferring the multi-layer composite film obtained by the step (3) from the rigid substrate to a flexible substrate; and
(5) pasting two electrodes at two ends of the multi-layer composite film and encapsulating with a flexible film.

3. The preparation method of the carbon material-polymer strain sensitive film, as recited in claim 2 , wherein:
in the step (1), the step of cleaning the surface of the rigid substrate comprises: sequentially ultrasonically cleaning the rigid substrate in acetone, ethanol and deionized water solution for 10-30 min, and then drying under nitrogen;
the step of processing the hydrophilic treatment on the rigid substrate comprises: sequentially putting the cleaned rigid substrate into concentrated sulfuric acid and hydrogen peroxide and respectively ultrasonically cleaning for 15-30 min and then drying under the nitrogen;
the step of processing the hydrophobic treatment on the rigid substrate comprises: after processing the hydrophilic treatment, putting the rigid substrate into a beaker, dropping TMCS (trimethylchlorosilane) solution into the beaker and sealing an opening of the beaker, and then putting the beaker into a constant temperature water tank, and then water-bathing at 60-80° C. for 40-60 min, and then drying under the nitrogen.

4. The preparation method of the carbon material-polymer strain sensitive film, as recited in claim 2 , wherein: the step (2) further comprises performing ultrasonic dispersion for 20-40 min, and magnetic stirring treatment for 10-20 min.

5. The preparation method of the carbon material-polymer strain sensitive film, as recited in claim 2 , wherein: in the step (3), the layer-by-layer assembly process comprises: (A) growing for 2-5 min after immersing the rigid substrate, which is performed the hydrophobic treatment, into the polymer dispersion solution, and then taking out the rigid substrate, and then drying through the nitrogen after cleaning through the deionized water solution, and then growing a layer of polymer film on the surface of the rigid substrate, (B) growing for 2-5 min after immersing the rigid substrate into the carbon material dispersion solution, and then taking out, and then drying through the nitrogen after cleaning through the deionized water solution, and then growing a layer of carbon sensitive film on the layer of polymer film, and (C) repeating above steps for several times, and finally forming the multi-layer composite film on the rigid substrate.

6. The preparation method of the carbon material-polymer strain sensitive film, as recited in claim 2 , wherein: in the step (4), the multi-layer composite film is transferred to the flexible substrate through a polymer colloidal material with good adhesion and high melting point.

7. The preparation method of the carbon material-polymer strain sensitive film, as recited in claim 2 , wherein: in the step (5), the electrodes are made from copper, gold, silver, carbon nanotube or graphene, and are drawn through pasting or printing, and the flexible film is made from PDMS (polydimethylsiloxane), polyethylene or polyimide.

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Tai Huiling
• Ye Xueliang
• Yuan Zhen
• Guo Rui
• Jiang Yadong
• Li Weizhi
• Du Xiaosong

Classifications

• C08L2203/16

  used for films · CPC title

• G01Q60/24

  AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes · CPC title

• C08J2379/02

  Polyamines · CPC title

• A61B5/024

  Measuring pulse rate or heart rate · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title