Flame-Synthesis of Monolayer Graphene Using Inverse-Diffusion Burners
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Solution Overview
Problem
Current methods for synthesizing carbon-based nanostructures, such as graphene, using flame synthesis face challenges in achieving large-scale production and controlling the growth of high-quality, large-area nanomaterials on substrates.
Innovation Solution
The use of a modified multi-element inverse-diffusion flames (m-IDFs) burner, which comprises an array of stabilized flames forming a uniform flat-flame front, allows for the synthesis of monolayer and nano-defective graphene on metal substrates. This method involves reacting an oxidizer and a fuel in non-premixed, multiple, inverse-diffusion flame burners, with the pyrolysis species directed onto substrates to form coatings or films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CVD methods are used to synthesize graphene, then high-quality graphene can be obtained, but the production scale is limited and processing time is long
Solution Approach 1:
The patent changes the fundamental synthesis parameters by transitioning from conventional CVD to flame synthesis methodology. This involves using flame temperatures (typically 800-1200°C) instead of controlled CVD temperatures, and using flame chemistry for carbon deposition instead of standard CVD gas-phase reactions. These parameter changes enable faster processing times and larger production scales while maintaining graphene quality.
Solution Approach 2:
The patent replaces the conventional CVD mechanical and chemical vapor deposition system with a flame-based synthesis system. Instead of using standard CVD equipment with controlled gas flows and heated chambers, the invention employs flame synthesis apparatus where carbonaceous materials are synthesized directly in a flame environment, fundamentally substituting the synthesis mechanism to achieve improved productivity.
2Ease of manufacture
If flame synthesis is used to produce carbon-based nanostructures, then scalability and cost are improved, but control over growth of high-quality nanomaterials on substrates is challenging
Solution Approach 1:
The patent segments the flame synthesis process into distinct zones and stages: a reaction zone where carbonaceous materials decompose in the flame, a transition zone where carbon species form, and a deposition zone where graphene grows on substrates. This segmentation allows independent optimization of each zone for both scalability and precision control, enabling flame synthesis to produce high-quality graphene with controlled growth characteristics.
Solution Approach 2:
The patent applies local quality by creating specific microenvironments within the flame synthesis system. Different regions of the flame are engineered to have specific temperature profiles, oxygen concentrations, and residence times that are optimized for different stages of graphene formation. This local optimization enables precise control over graphene quality while maintaining the overall scalability of the flame synthesis approach.
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 approach enables the controlled growth of high-quality graphene structures, including monolayer and nano-defective graphene, with tunable defects, suitable for applications in ultrafiltration, gas sensors, and optoelectronics. The method allows for large-area deposition and is scalable, with advantages in cost and processing time compared to conventional CVD methods.
Implementation Method 1
reacting an oxidizer (e.g., air or O2) and a fuel (e.g., hydrogen and/or hydrogen precursors) in one or more non-premixed, multiple, inverse-diffusion flame burner(s)
Implementation Method 2
the pyrolysis species exiting the multiple, inverse-diffusion flame burner are directed onto substrates (e.g., metal substrates such as copper) to form coatings
Implementation Method 3
pyrolysis species exiting the multiple, inverse-diffusion flame burner are directed onto substrates to form coatings, preforms, flakes, films, sheets, plates, discs
Data Source
AI summary
Methods for the production of carbon-based and other nanostructures are provided.