Halogen-Free MXene Synthesis via Base Etching
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Solution Overview
Problem
Conventional MXene synthesis using strong acids like hydrofluoric acid and hydrochloric acid results in materials with halogen elements on their surface, leading to high reactivity, low oxidation stability, and potential cytotoxicity and contamination in electronic devices.
Innovation Solution
A halogen-free MXene is manufactured by performing an etching process on a MAX phase material using a halogen-free etchant, followed by an impurity removal treatment with a halogen-free post-treatment agent, resulting in a material without halogen elements on its surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If strong acid etchants (hydrofluoric acid or hydrochloric acid) are used to synthesize MXene, then the etching process is effective and MXene is produced, but halogen elements are introduced on the MXene surface causing high reactivity and low oxidation stability
Solution Approach 1:
The patent changes the chemical composition parameter of the etchant from halogen-containing strong acids to halogen-free alternatives (such as lithium hydroxide, sodium hydroxide, potassium hydroxide, or their aqueous solutions). This parameter change eliminates halogen element introduction while maintaining effective etching capability, thereby resolving the contradiction between etching effectiveness and oxidation stability.
Solution Approach 2:
The patent employs readily available halogen-free base etchants that can be easily disposed of without special handling requirements for halogen waste. This approach replaces the expensive and hazardous halogen-containing acids with simpler, safer alternatives that achieve the same etching function without long-term stability issues.
2Ease of manufacture
If halogen-containing etchants are used, then MXene synthesis is achieved, but halogen ions are released causing contamination and malfunction of electronic devices
Solution Approach 1:
The patent extracts and removes the harmful halogen component from the etching system by completely eliminating halogen-containing substances from the process. The halogen-free etchants produce no halogen ions, thereby preventing contamination and malfunction of electronic devices while maintaining MXene synthesis capability.
3Productivity
If hydrofluoric acid or hydrochloric acid is used for MXene synthesis, then etching is performed effectively, but worker health is harmed and chemical waste disposal cost increases
Solution Approach 1:
The patent converts the harmful halogen-containing acid system into a beneficial halogen-free base system. The halogen-free etchants provide the same etching efficiency while eliminating health hazards and reducing waste disposal costs, effectively turning a harmful process into a safe and beneficial one.
4Ease of manufacture
If MXene with halogen elements is produced, then synthesis is successful, but the material decomposes into metal oxide and amorphous carbon over time making long-term storage impossible
Solution Approach 1:
The patent changes the surface functional group composition parameter by using halogen-free etchants, which prevents the formation of halogen-containing surface groups that cause decomposition. This parameter change enables long-term storage stability while maintaining successful synthesis, extending the storage duration from impossible to viable.
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 halogen-free MXene exhibits excellent chemical and oxidation stability, allowing for long-term storage without decomposition, and prevents contamination or malfunction in electronic devices, while also ensuring biocompatibility for applications in biosensors and other biological devices.
Implementation Method 1
performing an etching process to generate MXene from a MAX phase material
Implementation Method 2
performing an impurity removal treatment process of etching and removing impurities using a halogen-free etchant and a halogen-free post-treatment agent
Data Source
AI summary
The present invention provides a halogen-free MXene represented by the following formula (1), that has no halogen in its surface functional group by performing an etching process to generate MXene from a MAX Phase material, and after the etching process, performing an impurity removal treatment process of etching and removing impurities using a halogen-free etchant and a halogen-free post-treatment agent, respectively.Mn+1XnTx [Formula 1]wherein, M is a transition metal element selected from the group consisting of Sc, Ti, V, Cr, Mn, Y, Zr, Nb, Mo, Hf, and Ta, X is at least one of carbon and nitrogen, and n is an integer from 1 to 4, and Tx is a functional group selected from the group consisting of oxygen, alkoxide of 1 to 5 carbon atoms, alkyl, carboxylate, hydroxide, hydride, oxide, sub-oxide, nitride, sub-nitride, sulfide, sulfonate, thiol, and epoxide.