Carbon Micro-Wire Biosensor Manufacturing via Pyrolysis
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Solution Overview
Problem
Current biosensors face limitations in size and sensitivity, with optical sensors being bulky and complex, and electrochemical sensors having low sensitivity and slow response times, which restricts their application and increases manufacturing costs.
Innovation Solution
A method for manufacturing a biosensor using carbon micro/nanostructures, involving the formation of insulating layers, photoresist coating, exposing processes, and pyrolysis to create carbon electrodes and wires with controlled geometry, enabling improved sensitivity and reduced size, allowing for efficient oxidation and reduction reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensors are used for biomaterial detection, then sensitivity and response speed are improved, but device size and structural complexity increase
Solution Approach 1:
The patent replaces the optical sensing mechanism with an electrochemical sensing mechanism. Instead of using optical components (light sources, detectors, lenses) to detect biomaterials, the invention uses electrochemical cells with electrodes that measure electrical current changes resulting from oxidation-reduction reactions of the target analytes. This substitution of the sensing principle fundamentally reduces structural complexity while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from optical properties (light absorption, fluorescence) to electrochemical properties (current, voltage). By measuring electrochemical currents generated during oxidation-reduction reactions of analytes, the system achieves sensitive detection without requiring complex optical systems. This parameter change enables simpler device architecture while preserving measurement precision
2Device complexity
If electrochemical sensors are used for biomaterial detection, then device size and manufacturing cost are reduced, but sensitivity and response time decrease
Solution Approach 1:
The patent employs porous carbon materials as electrode structures. The porous structure provides dramatically increased surface area for electrochemical reactions, allowing more active sites for analyte detection. This enhanced surface area directly improves sensitivity and response time, addressing the main limitation of conventional electrochemical sensors while maintaining their structural simplicity and cost advantages
Solution Approach 2:
The patent uses composite carbon materials combining different carbon forms (carbon nanotubes, graphene, porous carbon) to create electrodes with optimized electrochemical properties. These composite structures provide enhanced electron transfer capability, increased surface area, and improved catalytic activity, all of which boost detection sensitivity and response speed while keeping the device compact and manufacturable
3Measurement precision
If electrodes are sufficiently separated to prevent electrochemical interference, then measurement accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The porous carbon electrode structure enables close spacing of electrodes while preventing interference. The porous matrix acts as a physical barrier that restricts the diffusion of electrochemical products between adjacent electrodes, allowing them to be positioned closer together without compromising measurement accuracy. This dramatically simplifies manufacturing compared to requiring large separations between electrodes
Solution Approach 2:
The porous carbon material serves as an intermediary structure between adjacent electrodes. It provides a controlled environment that allows electrodes to be in close proximity while the porous structure itself prevents direct interaction of electrochemical species between electrodes. This intermediary approach enables both high measurement accuracy and manufacturing simplicity
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 biosensor achieves enhanced sensitivity and reduced size, enabling efficient biomaterial detection with improved reaction efficiency and cost-effective mass production, utilizing carbon wires in various shapes and sizes formed through pyrolysis, without the need for expensive nano-fabrication equipment.
Implementation Method 1
performing the first exposing process on the first electrode region through the first photomask; performing the second exposing process to form the second electrode regions through the second photomask; performing the third exposing process on the top portion of the second photoresist layer through a photomask with open areas in the shape of micro-sized wires
Implementation Method 2
pyrolyzing the first and second electrode regions and the wires to form carbon electrodes and carbon wires
Implementation Method 3
The electrochemical sensors measure electrochemical currents flowing through external circuits that are generated in oxidation and reduction reactions of analytes
Data Source
AI summary
Disclosed is a method for manufacturing a biosensor comprising (a) forming an insulating layer in an electrode region; (b) coating the first photoresist layer on the insulating layer; (c) performing the first exposing process on the first electrode region through the first photomask; (d) removing unexposed area of the first photoresist layer except for the first electrode region using development; (e) coating the second photoresist layer on the first electrode region and the insulating layer after the step (d); (f) performing the second exposing process on the second electrode regions through the second photomask; (g) performing the third exposing process on the top portion of the second photoresist layer through a photomask with open areas in the shape of micro-sized wires connecting the second electrode regions; (h) removing the second photoresist layer except for the portions exposed in the steps (c), (f) and (g) using development.