3D Nanoprinting via SPM Tip Delivery of Charged Polyelectrolytes
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Solution Overview
Problem
Current 3D nanoprinting techniques face challenges in achieving nanometer precision and accommodating a wide range of functional materials due to limitations in material delivery and spatial resolution, such as those using micro-syringes and laser-induced polymerization, which struggle with precise delivery and material constraints.
Innovation Solution
A system utilizing a scanning probe microscope (SPM) tip to deliver a formulation of positively and negatively charged polyelectrolytes layer-by-layer, with controlled precision and curing, allowing for the formation of 3D nanostructures with nanometer accuracy and versatility in material use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If micro-syringe direct deposition is used, then submicron resolution can be achieved, but precise delivery of minute amounts of materials becomes difficult
Solution Approach 1:
The patent replaces the mechanical micro-syringe delivery system with an SPM-based tip delivery system. The SPM tip, positioned with nanometer precision, delivers materials through controlled contact with the substrate, eliminating the mechanical complexity of micro-syringe pumping and valve control while achieving both submicron resolution and precise material delivery.
Solution Approach 2:
The patent changes the delivery mechanism from bulk fluid injection to tip-based localized deposition. By controlling the SPM tip position, contact force, and deposition parameters (such as scanning speed and contact duration), the system achieves precise control over material placement at the nanoscale, resolving the contradiction between resolution and delivery precision.
2Manufacturing precision
If laser-induced photopolymerization is used, then 3D nanoprinting can be achieved, but spatial resolution is limited by the diffraction limit of laser light
Solution Approach 1:
The patent replaces the optical laser-based polymerization system with a mechanical SPM-based delivery system. Instead of using laser light to induce polymerization, the SPM tip delivers pre-formed polymer materials or precursors directly to the substrate, achieving nanometer-scale resolution that is not limited by optical diffraction.
Solution Approach 2:
The SPM tip acts as an intermediary between the material source and the substrate. It picks up materials and delivers them with nanometer precision, serving as a bridge that eliminates the need for complex optical focusing systems while achieving superior spatial resolution.
3Manufacturing precision
If sub-diffraction optical beam lithography is used, then 9 nm features can be fabricated, but only a limited set of photopolymerizable materials can be used
Solution Approach 1:
The SPM-based delivery system is universally applicable to multiple material types. The tip can deliver polymers, proteins, DNA, and other materials that cannot be used in photopolymerization, making the system versatile while maintaining nanometer-scale fabrication capability.
Solution Approach 2:
The patent changes the material delivery approach from optical activation to direct mechanical deposition. This allows the use of materials that are not photopolymerizable, expanding the material selection range while maintaining the ability to fabricate 9 nm features through precise tip positioning and controlled deposition.
4Manufacturing precision
If existing 3D nanoprinting techniques are used, then nanometer precision can be achieved, but high-throughput fabrication is limited
Solution Approach 1:
The SPM tip performs continuous scanning and deposition operations without interruption. The tip continuously delivers materials layer by layer, building 3D structures in a continuous process that maintains nanometer precision while increasing throughput compared to discrete deposition methods.
Solution Approach 2:
The system performs preliminary layer preparation and material deposition in advance, building structures layer by layer in a systematic sequence. This preliminary layer-by-layer construction enables efficient high-throughput fabrication while maintaining precision through controlled tip scanning and deposition parameters.
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
Enables the creation of 3D nanostructures with genuine nanometer precision and custom design, accommodating a wide range of functional materials, and high-throughput fabrication, overcoming previous limitations in material delivery and spatial resolution.
Implementation Method 1
uses a scanning probe microscope (SPM) tip to deliver an ink to form the 3D nanostructure, wherein the ink includes both a positively charged polyelectrolyte (PE) and a negatively charged PE
Implementation Method 2
curing the 3D nanostructure to remove excess positive or negative charges from the 3D nanostructure
Data Source
AI summary
The disclosed embodiments provide a system that forms a three-dimensional (3D) nanostructure through 3D printing. During operation, the system performs a 3D printing operation that uses multiple passes of a scanning probe microscope (SPM) tip to deliver an ink to form the 3D nanostructure, wherein the ink includes both a positively charged polyelectrolyte (PE) and a negatively charged PE. While delivering the ink, the SPM tip is loaded with the ink and moved to a target location to deposit the ink. Finally, after the multiple passes are complete, the system cures the 3D nanostructure to remove excess positive or negative charges from the 3D nanostructure.