CMOS Biochip Silane Functionalization for Spatial Probe Immobilization
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Solution Overview
Problem
Existing methods for surface functionalization of CMOS biochips require highly reactive chemical species, unfavorable reaction conditions, and are difficult to control spatially, making them inefficient for immobilizing molecular probes.
Innovation Solution
Utilizing azide-alkyne cycloaddition, specifically strain-promoted alkyne-azide cycloaddition (SPAAC), to covalently immobilize nucleic acid constructs on CMOS substrates through complementary chemical groups, allowing for rapid, quantitative bonding at neutral pH and room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If highly reactive chemical species are used for surface functionalization, then the reaction efficiency is improved, but the reaction control and spatial precision deteriorate
Solution Approach 1:
The patent introduces an intermediary silane layer as a mediator between the CMOS substrate and the nucleic acid probes. This silane layer contains reactive groups that can be spatially controlled to react with the probes, thereby maintaining both high reaction efficiency and precise spatial control. The intermediary layer acts as a buffer that enables controlled functionalization without requiring highly reactive species直接接触 the substrate.
2Strength
If highly reactive chemical species are used for surface functionalization, then the bonding strength is improved, but the reaction conditions become more extreme
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using silane-based chemistry with specific reactive groups (such as azide, alkyne, or other functional groups) that can form strong covalent bonds under mild conditions. This allows the reaction to proceed at room temperature or moderate temperatures rather than requiring extreme heat, while still achieving strong bonding between the probes and substrate.
3Device complexity
If conventional surface functionalization methods are used, then the process simplicity is maintained, but the spatial control capability deteriorates
Solution Approach 1:
The patent segments the surface functionalization process into distinct steps: first forming the silane layer on the substrate, then introducing the nucleic acid probes with complementary reactive groups. This segmentation allows each step to be optimized independently, maintaining overall process simplicity while enabling precise spatial control through the selective placement and reaction of the silane functional groups.
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
Enables efficient, spatially controlled immobilization of molecular probes on CMOS substrates without the need for extreme conditions, ensuring high stability and minimal reactivity with other functional groups.
Implementation Method 1
the first chemical group reacts with the second chemical group via an azide-alkyne cycloaddition, thereby immobilizing the nucleic acid construct on the substrate
Implementation Method 2
the azide-alkyne cycloaddition is a strain-promoted alkyne-azide cycloaddition (SPAAC)
Implementation Method 3
the depositing comprises a vapor deposition
Implementation Method 4
the depositing comprises a liquid deposition
Data Source
AI summary
The present disclosure provides methods and compositions for surface functionalization of solid substrates. The compositions include functionalized silanes and nucleic acid constructs which may react to immobilize the nucleic acid constructs on the surface on the solid substrate. The disclosure also provides methods for immobilization of silanes and nucleic acid constructs on the surface of the substrate.