Nanotube Fabric Rafting Control via Ionic Concentration

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Solution Overview

Problem

Current methods for controlling density and porosity in nanotube fabric layers and films are inadequate for achieving uniform dispersion and minimizing porosity, especially in devices with small circuit sizes, leading to inefficiencies in electronic structures and devices.

Innovation Solution

A method involving the preparation of a nanotube application solution with adjustable concentrations of nanotube elements and ionic particles to control rafting, allowing for the formation of nanotube fabrics with controlled density and porosity, including high-density, low-porosity or high-porosity configurations, by adjusting the concentration levels of nanotubes and ionic species in the solution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional methods are used to form nanotube fabric layers, then the fabrication process is simple, but the porosity and density are not uniformly controlled

Engineering Contradiction:

Improveuniformity of dispersion and porosity controlVSAvoidcomplexity of solution preparation and processing

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by systematically varying the concentration of ionic species in the nanotube application solution to control the degree of rafting and achieve desired porosity levels. By adjusting ionic concentration as a key parameter, the method enables precise control over nanotube fabric density and uniformity without fundamentally changing the fabrication process

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses ionic species as an intermediary substance in the application solution to mediate the interaction between nanotubes during deposition. These ionic species control the rafting behavior of nanotubes, enabling uniform dispersion and porosity control without requiring direct mechanical or chemical modification of the nanotubes themselves

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If porosity is reduced to meet small circuit size requirements, then device performance improves, but manufacturing precision becomes more difficult to achieve

Engineering Contradiction:

Improvedevice performance for small circuit sizesVSAvoiduniformity of nanotube dispersion

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent implements feedback control by characterizing the relationship between ionic species concentration and resulting fabric porosity/rafting degree. This characterization creates a feedback loop where desired porosity levels can be achieved by selecting appropriate ionic concentrations, enabling precise control even at low porosity levels required for small circuit devices

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by pre-characterizing nanotube formulations with different ionic species concentrations to determine their rafting behavior and resulting porosity. This preliminary characterization allows selection of the optimal formulation before actual device fabrication, ensuring uniform dispersion and desired porosity from the outset

Inventive Principle:

Principle #10Preliminary action

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 approach enables the creation of nanotube fabrics with precise control over density and porosity, ensuring uniform dispersion and minimizing porosity to meet the requirements of small circuit sizes, enhancing the performance and yield of electronic devices.

Implementation Method 1

adjusting the concentration levels of nanotubes and ionic species in the solution

Methodology Applied

Scientific EffectElectrostatic interaction: Electrostatics

Data Source

PatentUS11136239B2Methods for forming nanotube fabrics with controlled surface roughness and degree of rafting

Publication Date: 2021.10.05 ZEON CORP

AI summary

Methods for forming a nanotube fabric with a controlled surface roughness (or smoothness) and a selected degree of rafting are disclosed by adjusting the concentration levels of a selected ionic species within a nanotube formulation used to form the nanotube fabric. In one aspect, the present disclosure provides a nanotube formulation roughness curve (and methods for generating such a curve) that can be used to select a utilizable range of ionic species concentration levels that will provide a nanotube fabric with a desired surface roughness (or smoothness) and degree of rafting. In some aspects of the present disclosure, such a nanotube formulation roughness curve can be used adjust nanotube formulation prior to a nanotube formulation deposition process to provide nanotube fabrics that are relatively smooth with a low degree of rafting.