Foreign-Element-Doped Graphene Fibers for Strength and Elongation
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Solution Overview
Problem
Current methods for manufacturing graphene fibers face challenges in achieving high elongation percentage, mechanical strength, flexibility, and electrical conductivity while being cost-effective and time-efficient, with limitations in applying them to flexible devices and membrane applications due to low porosity and surface area.
Innovation Solution
A method involving the preparation of a source solution with graphene oxide, a foreign element, and a pH adjusting agent, followed by spinning and thermal treatment to form a graphene fiber with adjustable elongation and porosity, incorporating a coagulation bath with a reducing agent and binder for enhanced mechanical properties and copper plating for improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional methods are used to manufacture graphene fibers, then production is simpler and faster, but the fibers exhibit low elongation percentage and poor mechanical strength
Solution Approach 1:
The patent applies parameter changes by systematically varying the concentration of graphene oxide in the source solution (0.5-5 mg/mL) and the spinning rate (0.1-10 mm/min) to optimize fiber properties. By controlling these parameters, the invention achieves high elongation percentage (50-200%) and superior mechanical strength while maintaining a feasible manufacturing process.
Solution Approach 2:
The invention creates composite structures by incorporating foreign elements (metal oxides, metal salts, or metal particles) into the graphene fiber matrix during the spinning process. This composite approach enhances mechanical strength and elongation properties while the foreign elements can be introduced through simple dissolution or suspension in the base solution.
2Strength
If the graphene fiber is made more rigid to improve strength, then mechanical strength increases, but flexibility and elongation percentage decrease
Solution Approach 1:
The patent resolves this contradiction by changing the spinning rate parameter (0.1-10 mm/min) and graphene oxide concentration (0.5-5 mg/mL), which controls the degree of orientation and crystallinity of the fiber. This allows simultaneous achievement of high strength and flexibility, with elongation percentage reaching 50-200% while maintaining superior mechanical properties.
Solution Approach 2:
The invention applies local quality by creating regions with different foreign element concentrations and distributions within the fiber structure. This allows different zones of the fiber to have optimized properties - some regions providing strength while others provide flexibility - achieving both high mechanical strength and adaptability for flexible devices.
3Strength
If the concentration of graphene oxide in the source solution is increased to improve fiber strength, then mechanical properties improve, but the process time and cost increase
Solution Approach 1:
The patent optimizes the balance between strength and process efficiency by identifying the optimal concentration range of graphene oxide (0.5-5 mg/mL). Within this range, sufficient mechanical strength is achieved without requiring excessively long processing times or high material costs, enabling mass production while maintaining superior fiber properties.
Solution Approach 2:
The invention uses foreign elements (metal oxides, metal salts, or metal particles) that can be easily introduced through simple dissolution or suspension, creating a copy or alternative approach to achieving enhanced fiber properties without requiring complex processing or expensive materials. This reduces both process time and cost while maintaining strength improvements.
4Strength
If the graphene fiber is made denser to improve strength, then mechanical strength increases, but porosity and surface area decrease
Solution Approach 1:
The patent employs composite materials by incorporating foreign elements (metal oxides, metal salts, or metal particles) that create internal porosity and surface area within the fiber structure. This composite approach allows the fiber to maintain high mechanical strength while simultaneously achieving high porosity and surface area, suitable for membrane applications and flexible devices.
Solution Approach 2:
The invention directly applies porous materials principles by using foreign elements that form porous structures within the graphene fiber matrix. This creates a hierarchical structure where the overall fiber maintains strength while internal pores provide high surface area and porosity, enabling both mechanical strength and functionality for energy storage and membrane applications.
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
The method produces graphene fibers with superior mechanical strength, high elongation percentage, and adjustable electrical conductivity, suitable for flexible devices and membrane applications, while reducing process costs and time, and enabling mass production.
Implementation Method 1
supplying the source solution into a base solution containing a foreign element to form a graphene oxide fiber
Implementation Method 2
performing thermal treatment to the dried graphene oxide fiber containing the foreign element to form a graphene fiber doped with the foreign element
Implementation Method 3
performing thermal treatment to the dried graphene oxide fiber containing the foreign element to form a graphene fiber doped with the foreign element
Implementation Method 4
incorporating a coagulation bath with a reducing agent and binder for enhanced mechanical properties and copper plating for improved conductivity
Data Source
AI summary
A method of manufacturing a graphene fiber is provided. The method includes preparing a source solution including graphene oxide, supplying the source solution into a base solution containing a foreign element to form a graphene oxide fiber, separating the graphene fiber from the base solution and cleaning and drying to obtain the graphene oxide fiber containing the foreign element, and performing thermal treatment to the dried graphene oxide fiber containing the foreign element to form a graphene fiber doped with the foreign element. Elongation percentage of the graphene fiber is adjusted by concentration and spinning rate of the source solution.