Carbon Nanotube Yarn Field Emitter Adhesive Fixation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for manufacturing field emission elements using carbon nanotubes are either time-consuming and difficult to operate, or they fail to provide a strong binding force between the carbon nanotubes and the base, leading to instability under electrical-field forces.

Innovation Solution

A field emission element is created by wrapping a carbon nanotube yarn around an elongated body and using an electrically conductive adhesive agent to fix it in place, which is applied and solidified to ensure firm attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical methods are used to fix carbon nanotubes onto a base, then the carbon nanotubes can be positioned, but the process is time consuming and difficult to operate

Engineering Contradiction:

Improvefixation reliabilityVSAvoidease of operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical fixation method (robot arm manipulation) with a chemical bonding method using electrically conductive adhesive agent. This substitution eliminates the complexity of mechanical positioning while achieving reliable fixation through chemical adhesion between the adhesive and both the base and carbon nanotube yarn.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an electrically conductive adhesive agent as an intermediary substance between the base and carbon nanotube yarn. This adhesive mediator provides both mechanical bonding and electrical conductivity, solving the fixation problem without requiring complex mechanical manipulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If in-situ growth method is used to grow carbon nanotubes array on a base, then the carbon nanotubes can be grown directly, but the binding force between the carbon nanotubes array and the base is weak

Engineering Contradiction:

Improveease of manufactureVSAvoidbinding force

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent applies the electrically conductive adhesive agent to the base before placing the carbon nanotube yarn, creating a pre-prepared bonding surface. This preliminary action ensures that when the yarn is wrapped and pressed against the base, strong immediate bonding occurs, preventing the weak binding force problem of in-situ growth.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates a composite structure consisting of the base, electrically conductive adhesive agent, and carbon nanotube yarn. This composite construction combines the advantages of direct growth (electrical conductivity) with strong adhesive bonding, overcoming the weak binding force limitation of pure in-situ growth methods.

Inventive Principle:

Principle #40Composite materials

3Productivity

If in-situ growth method is used to grow carbon nanotubes array on a base, then the carbon nanotubes can be grown directly, but the carbon nanotubes array may easily fall away from the base or be pulled out by electrical-field force

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidstability under electrical-field force

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The electrically conductive adhesive agent serves as a mediator that provides both mechanical anchoring and electrical pathway. This mediator prevents the carbon nanotube yarn from falling away or being pulled out by electrical-field forces while maintaining the manufacturing efficiency of the wrapping process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the bonding mechanism from weak van der Waals forces (in in-situ growth) to strong chemical adhesion bonds through the electrically conductive adhesive agent. This parameter change in bonding strength ensures the carbon nanotube yarn remains stable under electrical-field forces during operation.

Inventive Principle:

Principle #35Parameter changes

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 allows for a simple, efficient, and stable fixation of carbon nanotubes to the elongated body, enhancing the mechanical and field emission performance of the element.

Implementation Method 1

an electrically conductive adhesive agent is applied between the elongated body and the carbon nanotube yarn, and the electrically conductive adhesive agent is configured for fixing the carbon nanotube yarn to the elongated body

Methodology Applied

Scientific EffectAdhesive: Adhesive

Data Source

PatentUS7550907B2Field emission element with carbon nanotube yarn

Publication Date: 2009.06.23 HON HAI PRECISION INDUSTRY CO LTD

AI summary

A field emission element (100) includes an elongated solid body (110), a carbon nanotube yarn (112) and an electrically conductive adhesive agent (114). The carbon nanotube yarn wraps round the elongated solid body. The electrically conductive adhesive agent is applied between the elongated solid body and the carbon nanotube yarn, and the electrically conductive adhesive agent is configured for fixing the carbon nanotube yarn to the elongated solid body. The substantially all of carbon nanotube yarn is entirely adhered on a peripheral surface of the elongated solid body.