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Flexible semi-clarity strain sensor and preparation method thereof

A strain sensor, flexible polymer technology, applied in the field of sensors, to achieve the effect of simple method, fast response sensitivity, and high durability

Inactive Publication Date: 2012-02-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it remains a great challenge to fabricate strain sensors that are transparent and capable of ultrahigh strains.

Method used

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  • Flexible semi-clarity strain sensor and preparation method thereof
  • Flexible semi-clarity strain sensor and preparation method thereof
  • Flexible semi-clarity strain sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The steps of the preparation method provided by the invention are as follows:

[0023] 1. Dissolve the nanofibers in an organic solvent and stir until the solution is clear. The resulting solution was transferred to a needle for electrospinning on a substrate.

[0024] When the nanofiber is polystyrene (PS), the organic solvent is: dimethylformamide (DMF) and toluene, and each gram of PS particles needs 1-2mL DMF and 1-2mL toluene;

[0025] When the nanofiber is polyvinylpyrrolidone (PVP), the organic solvent is: ethanol, and every gram of PVP powder needs 8~12mL ethanol;

[0026] When the nanofiber is polyvinylidene fluoride (PVDF), the organic solvent is: dimethylformamide (DMF) solution and acetone, and each gram of PVDF powder needs 2-4mL DMF and 5-9mL acetone;

[0027] The production process of the substrate: mix PDMS and curing agent according to the ratio of 2:1 to 20:1 by volume, and place it in a constant temperature oven at 40-120°C for 0.5-2 hours to cure. ...

example 1

[0033] 1. Mix 10mL PDMS and 1mL curing agent, and place in a constant temperature oven at 60°C for 1 hour to cure. After curing, cut the PDMS into 1.5cm*0.5cm size for later use.

[0034] 2. Dissolve 0.7 g of PS particles in 3 mL of a mixed solution of dimethylformamide (DMF) and toluene (volume ratio 1:1), and stir for 3 hours until the solution is clear. The resulting solution was transferred to a needle tube and the PS was evenly spun onto the PDMS using a propulsion speed of 0.003 mm / s.

[0035] 3. Prepare 125mL of 0.03mol / L zinc acetate methanol solution and 65mL of 0.01mol / L potassium hydroxide methanol solution. The resulting solution needs to be stirred at 60°C; The solution was added dropwise and stirred for 2 hours; after the nanoparticle solution was prepared, the flexible polymer substrate was soaked in the solution so that the ZnO nanoparticles were attached to the nanofibers.

[0036] 4. Prepare 50 mL of 32 mol / L zinc nitrate aqueous solution and 50 mL of 32 mo...

example 2～10

[0045] Examples 2-10 According to the same process as Example 1, the strain sensor provided by the present invention can be prepared by using the process parameters and materials shown in the following table.

[0046]

[0047] *Concentration units in the table are mol / L.

[0048] From the above analysis, it can be concluded that the present invention applies a flexible strain sensor prepared by synthesizing ZnO nanowire / nanofiber hybrid structure on a flexible polymer substrate, which has translucency, high durability, fast response and high sensitivity , can be used for precision mechanical detection, human motion monitoring and medical monitoring, and will have application prospects in future outdoor self-driving sensor systems. Any polymer that can be synthesized by electrospinning and any metal or metal oxide that can be grown by hydrothermal method can be used to fabricate flexible mechanical sensors.

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Abstract

The invention discloses a flexible semi-clarity strain sensor and a preparation method thereof. The sensor is characterized in that: a functional layer is provided on a flexible polymer substrate, the functional layer is a latticed structure which is formed by ZnO and nanofiber, and two sides of the functional layer are titanium and silver electrodes. The invention provides a method for preparinga super-high strain resistance semi-clarity stretching type mechanics sensor based on a zinc oxide nano wire / polystyrene nanofiber hybrid structure on a polydimethylsiloxane substrate. Transmissivities of the sensor before and after zinc oxide growth are represented. The sensor can detect force as high as 50% and has high endurance, rapid response and high sensitivity. A device can be applied to a human body rapid motion test simultaneously. In addition, through driving of a solar energy cell, the device becomes potential application of an outdoor self driven sensor system. The method in the invention has the characteristics of simplicity and a low price, and the sensor has the characteristics of semi-clarity, high strain resistance, high sensitivity, rapid response and the like.

Description

technical field [0001] The invention belongs to sensor technology, in particular to a flexible translucent strain sensor and a preparation method thereof. Background technique [0002] In recent years, research on transparent and stretchable electronic devices has become a research hotspot due to the increasing demand for portable commercial electronic products in the current society. Stretchable electronic devices have the ability to replace stretchable and arbitrarily deformable objects. By using stretchable and flexible materials instead of rigid substrates, stretchable electronic devices have been fabricated in optoelectronics, electromechanics and other fields. In the future, stretchable electronic devices have the potential to achieve important applications in many fields, such as foldable sensors, bendable displays, real-time monitoring and medical diagnosis. [0003] Buildings, bridges and other infrastructure are often subjected to natural disasters such as hurric...

Claims

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Application Information

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IPC IPC(8): G01B7/16B81C1/00
Inventor 周军肖旭袁龙炎钟俊文王中林
Owner HUAZHONG UNIV OF SCI & TECH
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