Conductive Nanomembrane for Miniaturized MEMS Bio-Sensors
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Solution Overview
Problem
Conventional bio-sensors face challenges in miniaturization, precise fluid flow control, and highly sensitive detection, particularly in bio-mechanical detection methods which are sensitive to temperature and require complex pre-treatment processes and laser-displacement measuring systems.
Innovation Solution
A conductive nanomembrane is formed by stacking a polymer electrolyte film and a carbon nanotube layer, with functionalized carbon nanotubes and an optional upper metal layer, used in a Micro Electro Mechanical System (MEMS) sensor to improve mechanical and electrical properties, enabling direct biomaterial fixation and capacitance-based detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional bio-optical detection method is used, then detection capability is achieved, but the device size becomes large and cost becomes high
Solution Approach 1:
The patent replaces the optical detection system (laser, spectrophotometer, fluorescent microscope) with a mechanical detection system based on MEMS technology. The bio-mechanical detection method directly measures mechanical displacement of a cantilever structure when biomaterials bind, eliminating the need for bulky optical instruments while maintaining detection capability. This substitution enables miniaturization of the entire device.
2Measurement precision
If a bio-mechanical detection method with thin gold film deposition is used, then detection resolution is improved, but the device becomes sensitive to temperature and requires complex pre-treatment
Solution Approach 1:
The patent changes the material parameter of the sensing layer from thin gold film to polymer electrolyte film with carbon nanotubes. This material substitution eliminates the bimetal effect that causes temperature sensitivity in gold film-based cantilevers. Additionally, the polymer electrolyte film inherently provides functional groups for biomaterial immobilization, eliminating the need for complex pre-treatment processes like gold film deposition and surface functionalization.
3Volume of moving object
If miniaturization is achieved through MEMS technology, then device size is reduced, but fluid flow control and detection sensitivity become more difficult
Solution Approach 1:
The patent employs a polymer electrolyte film that possesses porous or networked structure with carbon nanotubes. This structure provides high surface area for biomaterial immobilization while maintaining appropriate fluid flow characteristics. The porous structure allows biomolecules to access the sensing surface effectively even in miniaturized devices, addressing both detection sensitivity and fluid flow control challenges.
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 conductive nanomembrane enhances detection resolution and reliability, allows for miniaturization, and eliminates the need for complex surface treatments, while providing mechanical and electrical stability, suitable for various sensors including bio-sensors.
Implementation Method 1
a conductive nanomembrane which includes a lower polymer electrolyte film and a carbon nanotube layer formed on the polymer electrolyte film
Implementation Method 2
a carbon nanotube layer formed on the polymer electrolyte film
Implementation Method 3
enabling direct biomaterial fixation and capacitance-based detection
Data Source
AI summary
The present invention relates to a conductive nanomembrane and a Micro Electro Mechanical System sensor using the same, and more particularly, a conductive nanomembrane that is formed by stacking a polymer electrolyte film and a carbon nanotube layer, and a MEMS sensor using the same.