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Transient electronic device taking silk fibroin film as flexible substrate and preparation method of transient electronic device

A transient electronic device, silk fibroin technology, applied in electrical components, printed circuit manufacturing, printed circuit components, etc., to achieve the effects of excellent mechanical properties, low cost, and simple steps

Active Publication Date: 2020-09-04
白硕
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some challenges in fabricating flexible transient electronics based on silk fibroin films, that is, how to make silk film-based electronic devices stable in normal environment, but able to withstand given trigger conditions such as temperature, light, enzymes and solvents. It is of great significance to reduce electronic waste, promote information security and the development of wearable devices

Method used

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  • Transient electronic device taking silk fibroin film as flexible substrate and preparation method of transient electronic device
  • Transient electronic device taking silk fibroin film as flexible substrate and preparation method of transient electronic device
  • Transient electronic device taking silk fibroin film as flexible substrate and preparation method of transient electronic device

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Effect test

Embodiment 1

[0045] The preparation of embodiment 1 regenerated silk fibroin

[0046] Silk with 0.02M Na 2 CO 3 Cut into pieces after pretreatment to obtain degummed silk fibers; dissolve the degummed silk fibers in a ternary solvent system of calcium chloride / ethanol / water (molar ratio 1:2:8), the dissolution temperature is 75°C, and the dissolution time is 4h , after dissolution, use a dialysis bag with a molecular cut-off of MWCO 3500 for dialysis for 3 days to desalt; centrifuge the desalted silk fibroin solution twice at 9000rpm for 20min each time to remove silk aggregates and other impurities; that is, regenerated silk fibroin is prepared Protein solution, the solution was dried to 4% (w / v) in a fume hood for use.

Embodiment 2

[0047] The preparation of embodiment 2 silver nanowires

[0048] Silver nanowires were synthesized by a one-pot method, which specifically included the following steps:

[0049] Dissolve 0.2g of PVP in 25mL of EG at room temperature, then add 0.25g of silver nitrate to the PVP solution, avoid light. Subsequently, 3.5g FeCl 3 Saline solution (0.6 mM, solvent EG) was mixed with clear PVP solution and stirred for 1 min. The mixture was heated at 130° C. for 5 h, washed and concentrated, and the residue was removed with acetone and ethanol to obtain silver nanowires. Finally, the silver nanowire dispersion was prepared by dispersing the silver nanowires in ethanol (mass fraction: 5%).

Embodiment 3

[0050] Embodiment 3 Preparation of Interdigital Capacitance Sensor

[0051] Design and prepare a patterned template in advance, make the concave part of the template form an interdigitated shape, and make the width and spacing of the conductive strips 2 mm. The interdigitated conductive circuit can provide coupling across the gap between the drive electrode and the receive electrode.

[0052] Cast the silver nanowire dispersion prepared in Example 2 on the pre-designed patterned template, and prepare a functional conductive circuit on the polypropylene substrate; after the ethanol solution is completely evaporated, the prepared in Example 1 The regenerated silk fibroin solution is cast on the same patterned template, so that the silver nanoparticle circuit is transferred to the regenerated silk fibroin film, and after drying, a conductive pattern is formed on the regenerated silk fibroin film, and an interdigital capacitive sensor is prepared.

[0053] Scanning electron micro...

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Abstract

The invention relates to a transient electronic device taking a silk fibroin film as a flexible substrate and a preparation method of the transient electronic device. The transient electronic device comprises a flexible substrate and a conductive circuit, the flexible substrate comprises a water-soluble regenerated silk fibroin film, the conductive circuit comprises a silver nanowire, and the silver nanowire is transferred to the flexible substrate by casting a regenerated silk fibroin solution on a silver nanowire pattern. The transient electronic device has high light transmittance, excellent mechanical properties and excellent insulating properties, and can be dissolved in water within one minute after a task is completed. The invention further provides a corresponding preparation method, a two-time solution casting method is adopted, the steps are simple and easy to implement, the cost is low, the application prospect is good, and development and application of transient electronics in the field of information safety and wearable equipment are expected to be promoted.

Description

technical field [0001] The invention relates to the technical field of transient electronic devices, in particular to a transient electronic device with a silk fibroin film as a flexible substrate and a preparation method thereof. Background technique [0002] A transient device means that it can work stably within a set period of time after preparation, and when triggered by a specific condition, the device partially or completely disappears, thereby achieving irreversible structural and functional damage. With its self-destruction and disappearance characteristics, transient devices have important application value in the fields of implantable devices without taking out, degradable environmental protection devices, and information security to prevent sensitive information from leaking. [0003] Compared with traditional electronic devices, flexible transient electronic devices can adapt to uneven working surfaces and have transient degradation characteristics, which is ben...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L89/00C08K7/06H05K1/03H05K3/20
CPCC08J5/18H05K1/0313H05K3/20C08J2389/00C08K7/06C08K2201/011
Inventor 白硕王安河陈炀麻宇琦韩青权
Owner 白硕
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