Suspended 2D Nanomaterial Transfer via Carbon Nanotube Film
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Solution Overview
Problem
Current methods for preparing suspended two-dimensional nanomaterials, such as graphene, face issues with residual polymers from transfer methods and chemical pollution from etching methods, which affect performance characterization and device preparation.
Innovation Solution
A method involving a carbon nanotube film structure is used to support and transfer two-dimensional nanomaterials, where the nanomaterials are grown on a substrate, covered with a carbon nanotube film, and then transferred to a target substrate using a corrosion solution, allowing for precise placement and removal of the carbon nanotube film without leaving residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polymer transfer medium is used to transfer two-dimensional nanomaterials, then the nanomaterials can be transferred to a target substrate, but residual polymer remains on the nanomaterial surface causing pollution and affecting performance characterization
Solution Approach 1:
The patent extracts and removes the transfer medium completely from the final structure by using a dissolvable polymer that can be fully dissolved in water after transfer, eliminating residual pollution on the nanomaterial surface while maintaining the transfer function
Solution Approach 2:
The patent uses a water-soluble polymer as an intermediary transfer medium that facilitates the transfer process but can be completely removed by water dissolution, serving as a temporary mediator that leaves no harmful residues
2Object-affected harmful factors
If an etching method is used to create suspended nanomaterials, then no transfer medium is needed, but chemical pollution from the etching process affects the nanomaterial performance
Solution Approach 1:
The patent converts the potentially harmful etching process into a beneficial selective removal process by using selective area etching through patterned masks, where the etchant only removes sacrificial material in specific regions to create suspended areas without polluting the nanomaterial surface
3Ease of operation
If conventional transfer methods are used, then nanomaterials can be moved to target substrates, but wrinkles and cracks form on the nanomaterial surface reducing quality
Solution Approach 1:
The patent changes the physical and chemical parameters of the transfer medium by using a water-soluble polymer with controlled molecular weight and composition, allowing for gentle transfer processes that minimize mechanical stress and prevent wrinkle and crack formation on the nanomaterial surface
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 high-quality suspended two-dimensional nanomaterials with reduced wrinkles and cracks, no residual organic binders, and precise site-directed transfer, maintaining material integrity and allowing observation through the transparent carbon nanotube film.
Implementation Method 1
obtaining a composite structure comprising the two-dimensional nanomaterial layer and the carbon nanotube film structure by removing the first substrate with a corrosion solution
Data Source
AI summary
The present invention relates to a method for transferring two-dimensional nanomaterials. The method comprises the following steps: (S1) providing a first substrate with a two-dimensional nanomaterial layer on a surface of the first substrate; (S2) covering the two-dimensional nanomaterial layer with a carbon nanotube film structure; (S3) obtaining a composite structure comprising the two-dimensional nanomaterial layer and the carbon nanotube film structure by removing the first substrate with a corrosion solution to; (S4) placing the composite structure on a surface of a cleaning solution; (S5) providing a target substrate comprising at least one through hole, and picking up the composite structure from the cleaning solution with the target substrate by contacting the target substrate with the two-dimensional nanomaterial layer of the composite structure and covering the at least one through hole with two-dimensional nanomaterial layer; and (S6) removing the carbon nanotube film structure from the composite structure.