Biosensor Electrode Area Control via Slit Geometry
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Solution Overview
Problem
Existing methods for manufacturing analysis tools, such as biosensors, are complex and costly due to the need for precise control of electrode areas using photolithography, which can lead to deviations in sensitivity and measurement accuracy.
Innovation Solution
A method involving the formation of slits in electrodes with main and subsidiary lines, where spacers are attached to expose the main lines, allowing for accurate control of the effective electron transfer area without relying on insulating films, simplifying the manufacturing process and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is used to control the area of the reactive electrode, then the area can be precisely controlled, but the manufacturing process becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent extracts the insulating film from the electrode structure, eliminating the need for photolithography processes. The reactive electrode area is controlled directly by the electrode geometry itself rather than by opening patterns in an insulating film, thereby simplifying the manufacturing process while maintaining area control precision
Solution Approach 2:
Instead of using an insulating film with openings to define the reactive electrode area (conventional approach), the patent inverts the approach by making the electrode itself the defining structure. The reactive electrode area is controlled by the electrode's own geometric configuration without requiring additional insulating layers or photolithography steps
2Manufacturing precision
If photolithography is used to control the area of the reactive electrode, then the area can be controlled, but deviations in the opening dimension cause deviations in sensitivity
Solution Approach 1:
The insulating film and its opening patterns are completely removed from the electrode structure. The reactive electrode area is now defined solely by the electrode geometry, eliminating the source of deviation that occurred with opening dimension variations in photolithography processes
Solution Approach 2:
The patent applies different geometric configurations to different parts of the electrode structure. By designing the electrode with specific geometric features that inherently control the reactive area, local quality variations are minimized and sensitivity consistency is improved across multiple devices
3Ease of manufacture
If covers are used to control the reactive electrode area without insulating films, then manufacturing is simplified, but accurate control of the electrode area becomes difficult
Solution Approach 1:
The patent removes both insulating films and covers from the electrode structure, leaving only the electrode geometry to control the reactive area. This eliminates the need for positioning and shaping covers while maintaining accurate area control through inherent geometric design
Solution Approach 2:
The patent controls the reactive electrode area by changing the geometric parameters of the electrode itself (such as width, length, and shape) rather than using external covering elements. This direct geometric control achieves both manufacturing simplicity and area control accuracy
Data Source
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AI summary
This aims to provide an analyzing tool including a substrate (10), a first electrode (14) formed on the substrate (10) and having an action pole (14A), a second electrode (15) formed on the substrate (10) and having an opposed pole (15A), and a first regulating element (11) for regulating such a contact area in the action pole (14A) as to contact a specimen. The analyzing tool further comprises second regulating elements (18 and 19) for regulating the effective area for electron transfers in at least one of the action pole (14A) and the opposed pole (15A).