In-Liquid Plasma Diamond Synthesis via Microwave Irradiation
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Solution Overview
Problem
Existing methods for diamond production, such as high-pressure synthesis and gas-phase synthesis, face challenges like high costs, slow formation rates, and limited scalability, while in-liquid plasma methods require improvements for higher efficiency and broader applicability.
Innovation Solution
Irradiating a liquid solution with a specific ratio of carbon, hydrogen, and oxygen using electromagnetic waves to generate plasma for diamond production, utilizing a simple apparatus with a microwave source and a substrate heating system, allowing for high-rate diamond film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If gas-phase synthesis is used to form diamond, then diamond can be formed on a wide area, but the formation rate is very slow (1 μm during 20 hours)
Solution Approach 1:
The invention changes the phase parameter of the synthesis medium from gas to liquid, using liquid plasma instead of gas phase. This parameter change enables simultaneous achievement of high formation rate (20 μm per hour) and wide forming area, resolving the contradiction between formation rate and forming area that plagues gas-phase synthesis
Solution Approach 2:
The invention uses plasma generated in liquid medium that can dynamically expand to cover large substrate areas while maintaining high reactivity. The liquid plasma state allows the reactive species to distribute uniformly across the substrate surface, achieving both high deposition rate and wide area coverage
2Quantity of substance
If high-pressure synthesis apparatus is used, then diamond can be produced, but the apparatus is large scale and manufacturing cost is high
Solution Approach 1:
The invention replaces the mechanical high-pressure system with an electromagnetic field-based plasma generation system. Instead of using large-scale pressure vessels and mechanical compression devices, the invention uses electromagnetic waves to generate plasma in liquid medium, achieving diamond synthesis at atmospheric or near-atmospheric pressure, thereby dramatically simplifying the apparatus
Solution Approach 2:
The invention introduces liquid medium as an intermediary between the electromagnetic field and the carbon source. The liquid serves as both the plasma generation medium and the reaction environment, enabling energy transfer from electromagnetic waves to chemical reactions without requiring direct mechanical pressure application
3Productivity
If in-liquid plasma method is used, then high formation rate can be achieved, but the method requires optimization for broader applicability
Solution Approach 1:
The invention uses liquid medium that can serve multiple functions: plasma generation medium, heat transfer medium, and reaction environment. This multi-functionality makes the method adaptable to various substrate types and geometries, enhancing versatility while maintaining high formation rates
Solution Approach 2:
The invention optimizes the composition parameters of the liquid medium (specific ratios of carbon, hydrogen, and oxygen atoms) to achieve consistent high formation rates across different application scenarios. By controlling the atomic ratios within specific ranges, the method becomes universally applicable while maintaining high productivity
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 achieves a high diamond formation rate of up to 20 μm per hour with a simple apparatus, producing diamond films that exhibit high elasticity and hardness, surpassing conventional gas-phase synthesis rates and scalability limitations.
Implementation Method 1
electromagnetic wave is irradiated to a liquid containing carbon, hydrogen and oxygen in which the ratio of hydrogen atoms to the sum of carbon atoms and hydrogen atoms is from 0.75 to 0.82 and the ratio of carbon atoms to the sum of carbon atoms and oxygen atoms is from 0.47 to 0.58 so as to generate plasma in the liquid whereby diamond is produced
Data Source
AI summary
This invention is to provide a method for the production of diamond at a high rate and in a high efficiency using in-liquid plasma. The present invention is a method for the production of diamond using electromagnetic waves irradiated to a liquid containing carbon, hydrogen and oxygen in which the ratio of hydrogen atoms to the sum of carbon atoms and hydrogen atoms is from 0.75 to 0.82 and the ratio of carbon atoms to the sum of carbon atoms and oxygen atoms is from 0.47 to 0.58 so as to generate plasma in the liquid.