CNT Yarn Field Emitter Manufacturing via Segmented Burning
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Solution Overview
Problem
The production of CNT yarns with consistent field emission properties is challenging due to varying end shapes and uncontrollable lengths, making it difficult to manufacture multiple CNT yarns with similar emission properties.
Innovation Solution
A method involving dividing a CNT yarn into segments, attaching them to a heat conductor, and burning the segments to create field emitters, ensuring consistent length and shape, thereby achieving uniform field emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CNT yarns are manufactured using conventional methods, then production can proceed, but the field emission properties vary significantly due to different end shapes and uncontrollable lengths
Solution Approach 1:
The CNT yarn is divided into multiple segments with controlled lengths, and each segment is processed individually through attachment to heat conductors and selective burning. This segmentation allows precise control over the final field emitter dimensions and shape, ensuring consistent field emission properties across multiple emitters.
Solution Approach 2:
The method performs preliminary actions by first attaching CNT yarn segments to heat conductors before burning. This preliminary attachment ensures proper positioning and shape control during the subsequent burning process, which is critical for achieving uniform field emission properties. The heat conductor serves as a template that guides the formation of the desired emitter geometry.
2Manufacturing precision
If CNT yarn length is left uncontrolled, then manufacturing is simpler, but the field emission properties become inconsistent
Solution Approach 1:
The CNT yarn is cut into multiple segments of predetermined lengths. This segmentation allows each segment to be processed independently with precise length control, ensuring that all resulting field emitters have consistent dimensions and uniform field emission properties.
Solution Approach 2:
The method controls the length parameter of CNT yarn segments through deliberate cutting and selection. By changing the length parameter from uncontrolled to precisely defined values, the invention ensures consistent field emission characteristics while accepting the additional process step of length control.
3Manufacturing precision
If different CNT yarn end shapes are accepted, then production variety increases, but field emission uniformity decreases
Solution Approach 1:
The heat conductor is attached to the CNT yarn segment before burning in a preliminary step. This preliminary attachment establishes a template that guides the burning process to create uniform end shapes. The heat conductor's geometry determines the final shape of the field emitter, ensuring consistency across all emitters regardless of the original yarn shape variations.
Solution Approach 2:
The heat conductor acts as an intermediary object between the CNT yarn and the burning process. It mediates the shape formation by providing a physical template that the CNT yarn conforms to during burning. This intermediary ensures that all field emitters achieve the desired uniform shape while allowing flexibility in the original yarn characteristics.
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 enables the production of field emitters with consistent field emission properties, as demonstrated by SEM images and field emission curves showing similar properties across multiple emitters.
Implementation Method 1
attaching the CNT yarn segment to a heat conductor; and burning the CNT yarn segment
Data Source
AI summary
A method for manufacturing a field emitter, includes the steps of: providing a CNT yarn segment; attaching the CNT yarn segment to a heat conductor; and burning the CNT yarn segment thereby yielding a remaining portion of the CNT yarn segment for use as a field emitter. It is proper to manufacture a plurality of field emitters with essentially even field emission properties using the present method.