Multilayer Structures with Reentrant Spaces for Biosensor Protection
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Solution Overview
Problem
Current biosensing technologies face challenges in protecting molecules from their surroundings and efficiently capturing peroxide, leading to reduced signal quality and limited sensitivity due to high impedance and substrate concentration limitations.
Innovation Solution
The development of multilayer structures comprising alternating materials with differential etching rates, forming reentrant spaces that increase surface area and enable selective molecule binding and protection, while promoting peroxide capture and oxygen recycling through controlled nanoscale geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If molecules are exposed to their surroundings for biosensing, then molecule capture is enabled, but molecules are unprotected from degradation and signal quality deteriorates
Solution Approach 1:
The patent implements nested protective layers around molecules, with inner layers providing primary protection and outer layers providing additional protection. Multiple reentrant spaces are nested within the multilayer structure, creating a hierarchical protection system that shields molecules from harmful environmental factors while maintaining biosensing functionality.
Solution Approach 2:
The patent uses thin film multilayer structures with reentrant spaces that create flexible protective environments for molecules. The alternating materials with different etching rates form delicate thin film structures that provide molecular protection while maintaining the necessary flexibility and porosity for biosensing operations.
2Measurement precision
If traditional flat sensor surfaces are used, then device simplicity is maintained, but surface area is limited and sensitivity is reduced
Solution Approach 1:
The patent transitions from flat two-dimensional surfaces to three-dimensional multilayer structures with reentrant spaces. This dimensional transformation creates vertical cavities and multiple exposure surfaces, dramatically increasing the effective surface area available for molecule capture while maintaining a compact footprint on the substrate.
Solution Approach 2:
The patent divides the sensor surface into multiple segmented layers with alternating materials. Each layer contributes to the overall surface area, and the reentrant spaces created by selective etching segment the structure into multiple cavities that collectively provide extensive surface area for enhanced sensitivity.
3Area of stationary object
If multilayer structures with reentrant spaces are created, then surface area and molecule protection are improved, but manufacturing complexity increases
Solution Approach 1:
The patent controls the complexity of multilayer structures by systematically varying parameters such as layer thickness, number of layers, and etching conditions. By adjusting these parameters, the reentrant spaces and surface area can be optimized without proportionally increasing manufacturing complexity, as the same deposition and etching processes are reused iteratively.
Solution Approach 2:
The patent applies local quality by creating reentrant spaces only in specific regions where molecule capture is needed, rather than uniformly complicating the entire structure. The alternating materials are selectively etched to produce localized cavities with enhanced surface area, maintaining simplicity in regions where protection and capture are less critical.
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 enhances biosensor performance by increasing surface area, improving signal-to-noise statistics, and extending the linear range of enzyme-based sensors without compromising sensitivity, effectively protecting molecules and enhancing peroxide capture and oxygen recycling.
Implementation Method 1
a second plurality of layers of a second material different than the first material, wherein the first plurality of layers and the second plurality of layers alternate to form a multilayer vertical structure protruding vertically on top of the substrate and having reentrant spaces
Implementation Method 2
depositing on the substrate a first layer of a first material; depositing on the first layer a second layer of a second material different than the first material
Data Source
AI summary
A multilayer structure can selectively bind certain molecules, due to reentrant spaces having an appropriate size. The multilayers can be fabricated by alternating layers of two different materials having different etching rate. The layers of the material having a higher etching rate form reentrant spaces which can protect molecules from further chemical interactions.