Graphene Coating on Uneven Surfaces via Graphene Oxide Deposition
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Solution Overview
Problem
Existing methods struggle to form graphene on complex curved surfaces or uneven objects, limiting its application in electric devices requiring high capacity and durability.
Innovation Solution
A method involving immersion in a graphene oxide solution followed by heat treatment is used to form a graphene layer on uneven surfaces, utilizing electrophoresis for uniform deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CVD method or coating method is used to form graphene, then graphene can be formed on flat surfaces with good conductivity and mechanical strength, but it is difficult to form graphene on complex curved surfaces or uneven objects
Solution Approach 1:
The patent changes the chemical state of carbon material from graphite to graphene oxide through oxidation, enabling it to be dispersed in solutions. This parameter change allows the carbon material to conform to complex surfaces while maintaining controllable deposition through solution processing, resolving the contradiction between surface adaptability and layer uniformity
Solution Approach 2:
The patent uses graphene oxide as an intermediary substance that can be dispersed in solutions and deposited on complex surfaces. The graphene oxide serves as a mediator between the solution and the final graphene product, enabling uniform coverage on uneven surfaces through solution penetration and subsequent reduction, thus achieving both surface adaptability and deposition uniformity
2Quantity of substance
If graphene is formed on uneven objects to increase surface area for power storage, then capacity increases, but the structural integrity and durability may deteriorate
Solution Approach 1:
The patent employs thin film graphene layers formed on uneven objects as flexible coatings that conform to the substrate geometry. These thin film structures provide high surface area for power storage while maintaining structural flexibility and integrity, preventing material deterioration during repeated charging and discharging cycles
Solution Approach 2:
The patent creates composite structures by forming graphene layers on uneven substrate objects. The combination of the substrate's mechanical support and graphene's high surface area creates a composite material system that achieves both high power storage capacity and structural durability, as the substrate provides mechanical integrity while graphene provides electrochemical activity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the formation of graphene with a practically uniform thickness on complex surfaces, enhancing the flexibility and durability of electric devices, particularly in power storage applications.
Implementation Method 1
a graphene oxide layer can be formed by an electrophoresis method using the object as an anode
Implementation Method 2
performing heat treatment to reduce the graphene oxide to form a graphene layer on the surface of the object
Data Source
AI summary
Graphene is formed with a practically uniform thickness on an uneven object. The object is immersed in a graphene oxide solution, and then taken out of the solution and dried; alternatively, the object and an electrode are immersed therein and voltage is applied between the electrode and the object used as an anode. Graphene oxide is negatively charged, and thus is drawn to and deposited on a surface of the object, with a practically uniform thickness. After that, the object is heated in vacuum or a reducing atmosphere, so that the graphene oxide is reduced to be graphene. In this manner, a graphene layer with a practically uniform thickness can be formed even on a surface of the uneven object.