Nanotube Sorting and Electrochemical Alignment
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Solution Overview
Problem
Existing methods for depositing nanotubes onto workpieces often result in random configurations and the deposition of undesired types of nanotubes, making it difficult to achieve the desired arrangement and type of nanotubes for specific applications such as transistors, interconnects, and memory devices.
Innovation Solution
A method and apparatus that utilize a deposition fluid containing different types of nanotubes, with a sorting unit to separate and isolate desired nanotubes based on characteristics, and an electrical field to electrochemically deposit them onto a workpiece in a controlled, desired configuration, such as parallel alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nanotubes are deposited using suspension immersion or CVD processes, then nanotubes can be deposited onto the workpiece surface, but the nanotubes are deposited in a random configuration rather than a desired arrangement
Solution Approach 1:
The patent applies preliminary action by pre-aligning nanotubes in the suspension before deposition. Nanotubes are oriented in a desired configuration using external fields (electric, magnetic, or optical) prior to the deposition process, so that when they are deposited onto the workpiece, they already possess the desired arrangement. This resolves the contradiction by preparing the nanotubes in advance with the correct orientation, achieving precise manufacturing without complicating the overall deposition process.
Solution Approach 2:
The patent replaces mechanical deposition methods (such as physical immersion or CVD) with a field-based approach. External electric, magnetic, or optical fields are used to control nanotube orientation and deposition, substituting complex mechanical positioning systems with simpler field-based control mechanisms. This enables precise nanotube arrangement while maintaining ease of manufacture through the use of well-established field interaction principles.
2Manufacturing precision
If all types of nanotubes are deposited onto the workpiece surface, then complete coverage is achieved, but undesired nanotube types are deposited along with desired nanotubes
Solution Approach 1:
The patent applies local quality by creating different local conditions in the deposition environment to selectively deposit specific nanotube types. Different regions of the workpiece or different zones in the deposition chamber are treated differently using selective fields (e.g., electric fields of specific orientations, magnetic field gradients) that attract only the desired nanotube types to specific locations. This enables precise control over which nanotube types are deposited where, achieving high selectivity while maintaining adequate deposition quantities.
Solution Approach 2:
The patent utilizes parameter changes by varying field parameters (electric field strength, magnetic field orientation, optical field frequency) to control nanotube deposition selectivity. By adjusting these parameters, the system can selectively deposit different nanotube types based on their unique properties. This resolves the contradiction by using parameter modulation to achieve both high nanotube type selectivity and sufficient deposition quantity.
3Shape
If electroplating is used to arrange nanotubes in a desired configuration, then nanotubes can be aligned parallel to each other, but different types of nanotubes in the plating solution are generally plated onto the workpiece
Solution Approach 1:
The patent applies segmentation by separating the deposition process into distinct stages: first sorting/selecting the desired nanotube types from the suspension, then depositing them in the desired configuration. This segmentation allows independent optimization of nanotube type selection and alignment, resolving the contradiction by addressing each function in a separate, controlled step rather than attempting to achieve both simultaneously in a single electroplating process.
Solution Approach 2:
The patent introduces intermediary elements (such as field generators or sorting mechanisms) between the nanotube suspension and the workpiece. These intermediaries selectively interact with the nanotubes to sort and align them before deposition, acting as a mediator that enables both type purity and proper alignment without requiring the workpiece itself to perform both functions simultaneously.
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 precise deposition of selected nanotubes in desired arrangements, improving the fabrication of components like transistors, interconnects, and emitters by ensuring the correct type and orientation of nanotubes are deposited, enhancing the performance and functionality of electronic and mechanical devices.
Implementation Method 1
establishing an electrical field between the surface of the workpiece and a counter-electrode in the deposition fluid. The electrical field electrochemically deposits at least one of the first portion of the nanotubes and/or the second portion of the nanotubes onto the workpiece
Implementation Method 2
separating a first portion of the nanotubes from a second portion of the nanotubes in the deposition fluid
Data Source
AI summary
Methods and apparatus for forming devices using nanotubes. In one embodiment, an apparatus for depositing nanotubes onto a workpiece comprises a vessel configured to contain a deposition fluid having a plurality of nanotubes including first nanotubes having a first characteristic and second nanotubes having a second characteristic. The apparatus further includes a sorting unit in the vessel configured to selectively isolate or otherwise sort the first nanotubes from the second nanotubes, and a field unit in the vessel configured to attach the first nanotubes to the workpiece. For example, the field unit can attach the first nanotubes to the workpiece such that the first nanotubes are at least generally parallel to each other and in a desired orientation relative to the workpiece.