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Application of graphene in energy conversion of moving droplets and methods for energy harvesting and motion sensing

A technology of energy conversion and energy collection, which is used in measuring devices, fluid velocity measurement, indicating/recording actions, etc., to achieve the effect of simple preparation method and reliable operation

Active Publication Date: 2017-02-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to use the excellent properties of graphene to realize energy conversion devices and sensor devices remains to be studied.

Method used

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  • Application of graphene in energy conversion of moving droplets and methods for energy harvesting and motion sensing
  • Application of graphene in energy conversion of moving droplets and methods for energy harvesting and motion sensing
  • Application of graphene in energy conversion of moving droplets and methods for energy harvesting and motion sensing

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preparation example Construction

[0052] The above-mentioned method for preparing the electrode can be direct coating of conductive glue, or standard screen printing process, or vacuum coating process such as ion sputtering, electron beam evaporation, thermal evaporation, or magnetron sputtering.

[0053] The aforementioned hydrophobic materials are paraffin, silica gel, grease, polytetrafluoroethylene and the like.

[0054] The droplets mentioned above can be any liquid containing ions such as salt solution, acid solution, alkali solution, etc. The droplet volume is not limited.

Embodiment 1

[0057] 1. Prepare the polyethylene substrate, ultrasonically clean the substrate with acetone, ethanol, and deionized water for 10 minutes, and then dry.

[0058] 2. Vapor chemical deposition of graphene: Take 25 micron thick copper foil as the base, maintain the growth temperature of 1000 ℃, and pass in methane and hydrogen. The gas flow is 25 sccm of methane and 10 sccm of hydrogen. After 15 minutes of growth, turn off the methane and keep the hydrogen flow at 10 sccm. It is quickly cooled to room temperature under protection, and a graphene material with 1-2 layers is obtained on the copper.

[0059] 3. The graphene is transferred to the polyethylene substrate: the surface of the copper sheet covered with graphene is suspended-coated with PMMA solution. After the solvent evaporates, the copper sheet is soaked in a 0.6M ammonium persulfate solution. After 2 hours, the copper is completely dissolved to obtain The graphene-PMMA layer floating on the solution is transferred to the p...

Embodiment 2

[0064] According to the method of implementation example 1, but the difference from implementation example 1 is

[0065] 1. Prepare the quartz substrate, ultrasonically clean the substrate with acetone, ethanol, and deionized water for 10 minutes, and then dry.

[0066] 2. Vapor chemical deposition of graphene: Take 25 micron thick copper foil as the base, maintain the growth temperature of 1000 ℃, and feed in methane and hydrogen. The gas flow is 40 sccm of methane and 10 sccm of hydrogen. After 15 minutes of growth, turn off the methane and keep the flow of hydrogen at 10 sccm. It is quickly cooled to room temperature under protection, and a graphene material with 1-3 layers is obtained on the copper.

[0067] 3. The graphene is transferred to the polyethylene substrate: the surface of the copper sheet covered with graphene is suspended-coated with PMMA solution. After the solvent evaporates, the copper sheet is soaked in a 0.6M ammonium persulfate solution. After 2 hours, the copp...

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Abstract

The invention provides an application of graphene in energy conversion and sensing of moving droplets and an energy collection and motion sensing method. When the droplet on the graphene surface moves, due to the charge and discharge of the double electric layer formed by the ions in the droplet on the surface of the graphene at the front and rear ends of the droplet movement, energy will be generated at both ends of the graphene along the direction of the droplet movement. a voltage. This voltage is linearly related to the speed of droplet movement, and its polarity depends on the direction of droplet movement. Energy harvesting and sensing of the speed, direction and time of the droplet movement are achieved through the voltage generated by the moving droplets across the graphene.

Description

Technical field [0001] The invention relates to the field of energy collection and conversion, in particular to an application of graphene in energy conversion of moving liquid droplets and an energy collection and motion sensing method. Background technique [0002] Energy conversion devices and flow sensors that can collect electricity from flowing water play an important role in many fields, such as collecting energy, characterizing the electrochemical properties of materials, and real-time medical diagnosis. The working mechanism of these devices mostly relies on the flowing potential, that is, when the electrolyte passes through a narrow hole or gap, an electrokinetic phenomenon is generated at both ends of the solution with a potential difference. But these applications are limited to some specific situations. Since 2001, the theory predicted that when carbon nanotubes are placed in a flowing liquid, an electric current will be generated inside them. Many experiments have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/00H01L35/00H01L39/00H10N10/00H10N60/00
CPCH02N11/002G01P5/08G01P13/02
Inventor 郭万林殷俊李雪梅
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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