CNT Emitter Paste Manufacturing with Nano-Metal Particles
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Solution Overview
Problem
Conventional methods for manufacturing carbon nano-tube (CNT) emitters for field emission devices face challenges such as non-uniform adhesion, increased contact resistance, and reduced lifespan due to the use of frit glass fillers, which hinder high-resolution pixel formation and uniform electron emission.
Innovation Solution
A CNT paste is formulated with a nano-sized metal particle that melts at a low temperature, along with an organic binder, photosensitive material, and monomer, allowing for fine-patterning and surface activation to improve adhesion and electron emission uniformity, while maintaining CNT integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If frit glass filler is used in CNT paste, then the paste can be manufactured with conventional materials, but the CNT distribution becomes non-uniform and adhesion deteriorates
Solution Approach 1:
The patent changes the key parameter of filler material from conventional frit glass (micrometer scale) to nano-sized metal particles. This parameter change enables uniform CNT distribution and strong adhesion while maintaining conventional paste manufacturing processes. The nano-scale dimension and metallic properties fundamentally improve the paste characteristics without requiring new manufacturing equipment or methods.
2Device complexity
If frit glass filler is used in CNT paste, then the paste structure is simple, but contact resistance increases and reliability decreases
Solution Approach 1:
The patent creates a composite material system combining CNTs with nano-sized metal particles. This composite structure leverages the electrical conductivity and adhesion properties of metal nanoparticles to reduce contact resistance and improve reliability, while maintaining a relatively simple paste formulation that can be integrated into existing manufacturing workflows.
3Ease of manufacture
If conventional CNT paste is used, then the manufacturing process is simple, but fine-patterning capability is insufficient for high-resolution displays
Solution Approach 1:
The patent introduces photosensitive materials and monomers into the paste composition, fundamentally changing the material's response to light exposure. This enables fine-patterning through photolithography processes, allowing precise pixel formation for high-resolution displays while maintaining compatibility with standard semiconductor manufacturing techniques.
4Device complexity
If CNT emitter is formed without strong adhesion, then the manufacturing process is less complex, but the emitter detaches under intense electric field
Solution Approach 1:
The patent changes the adhesion mechanism by introducing nano-sized metal particles that create strong metallic bonds with both the substrate and CNTs. This parameter change in the bonding mechanism provides robust adhesion that withstands intense electric fields during operation, preventing emitter detachment and ensuring long-term reliability.
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
The method enhances the reliability and electron emission characteristics of CNT emitters by ensuring uniform adhesion, reducing contact resistance, and extending the emitter's lifespan, making it suitable for high-resolution applications.
Implementation Method 1
a nano-sized metal particle which is melted at a low temperature at which a CNT does not deteriorate
Implementation Method 2
a photosensitive material and a monomer, allowing for fine-patterning
Data Source
AI summary
A method of manufacturing a carbon nano-tube (CNT) emitter includes the steps of: (a) dispersing a CNT powder, an organic binder, a photosensitive material, a monomer, and a nano-sized metal particle in a solvent to manufacture a CNT paste; (b) coating the CNT paste onto an electrode formed over a substrate; (c) exposing the CNT paste coated on the electrode to thereby perform fine-patterning; (d) plasticizing the finely patterned CNT paste; and (e) processing a surface of the CNT paste such that the surface of the plasticized CNT paste is activated, wherein step (d) includes a first plasticizing step performed in an air atmosphere; and a second plasticizing step performed in a vacuum or inactive gas atmosphere. Improved uniformity of electron emissions in a field emission device is achieved and a plurality of CNT emitter regions are formed within a single pixel.