Conductive Nanostructure with Interfacial Compound for Field Emitter
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Solution Overview
Problem
Current methods for manufacturing field emission tips with nanostructures, such as CNTs, face challenges in controlling aspect ratio, adhesion to substrates, and achieving high electron emission efficiency, particularly in atomic force electron microscopes, where mechanical strength and chemical resistance are crucial.
Innovation Solution
A method involving electrical discharge machining in an air environment is used to form conductive nanostructures on substrates, specifically tungsten oxide and CNTs, with a conductive interfacial compound like tungsten carbide, allowing precise control of nanostructure length and aspect ratio, enhancing adhesion and reducing contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (adhesion or CVD) are used to form CNT on metal tip, then nanostructure can be formed, but aspect ratio control and adhesion reliability are insufficient
Solution Approach 1:
The patent applies electrical discharge machining parameters (voltage, current, pulse duration) to precisely control the length and aspect ratio of conductive nanostructures. By adjusting discharge parameters, the aspect ratio can be accurately controlled while maintaining adhesion through the formation of conductive interfacial compounds at the interface between substrate and nanostructure
Solution Approach 2:
The patent creates a composite structure consisting of conductive substrate, conductive nanostructure (CNT), and conductive interfacial compound. This composite approach ensures excellent adhesion between components while maintaining high electron emission efficiency and mechanical strength
2Measurement precision
If high aspect ratio structure is used to achieve high resolution, then measurement resolution improves, but mechanical strength decreases and structure becomes more fragile
Solution Approach 1:
The patent forms a composite structure where CNT nanostructures are grown on metal substrate with conductive interfacial compounds. This composite design provides both high aspect ratio for resolution and enhanced mechanical strength through the reinforcing effect of CNT and the bonding effect of interfacial compounds
Solution Approach 2:
The patent performs preliminary electrical discharge machining to form conductive interfacial compounds and pre-structure the substrate before final nanostructure formation. This preliminary action ensures strong adhesion and mechanical support for the high aspect ratio nanostructure, preventing breakage during operation
3Productivity
If electrical discharge machining is performed in air environment, then processing is simplified and productivity increases, but oxidation of conductive materials may occur
Solution Approach 1:
The patent controls electrical discharge parameters (short pulse duration, appropriate voltage) to minimize exposure time to air environment during machining. By optimizing discharge parameters, productivity is maximized while oxidation is limited to controlled formation of conductive interfacial compounds rather than harmful bulk oxidation
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 fabrication of field emitters with improved mechanical stability, reduced contact resistance, and enhanced electron emission efficiency, with a threshold field range of 0.64 V/μm to 0.74 V/μm and stable discharge properties under 2.0 V/μm, effectively addressing the limitations of existing techniques.
Implementation Method 1
an apex cross-section of the conductive nanostructure has a surface step under 1 μm by an electrical discharge machining
Data Source
AI summary
The present invention relates to a conductive nanostructure, a method for molding the same, and a method for manufacturing a field emitter using the same. More particularly, the present invention relates to a field-emitting nanostructure comprising a conductive substrate, a conductive nanostructure arranged on the conductive substrate, and a conductive interfacial compound disposed in the interface between the conductive substrate and the conductive nanostructure, as well as to a method for molding the same, and a method for manufacturing a field emitter using the same.