CMOS Biochip Surface Functionalization via Silane Click Chemistry
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Solution Overview
Problem
Existing methods for surface functionalization of CMOS biosensor arrays require highly reactive chemicals, extreme conditions, and are difficult to control spatially, limiting the efficient immobilization of molecular probes.
Innovation Solution
The use of functionalized silanes and nucleic acid constructs with complementary chemical groups, such as azide-alkyne cycloaddition, for covalent immobilization on CMOS substrates, allowing for orthogonal reactions that are rapid, quantitative, and do not require extreme pH or long incubation times.
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 conditions become unfavorable (high temperature or pH)
Solution Approach 1:
The patent changes the chemical parameters by using azide-alkyne cycloaddition chemistry instead of traditional highly reactive chemical species. This allows the reaction to proceed efficiently under milder temperature and pH conditions while maintaining high reaction efficiency through the specific chemical reactivity of the azide and alkyne groups
Solution Approach 2:
The patent introduces silane molecules as intermediaries that first bind to the CMOS substrate surface, then present azide or alkyne groups for subsequent reaction with complementary nucleic acid constructs. This intermediary approach enables controlled functionalization under favorable conditions
2Reliability
If traditional surface functionalization methods are used, then covalent bonding is achieved, but spatial control is difficult
Solution Approach 1:
The patent applies different functional groups (azide vs. alkyne) to specific locations on the substrate surface through controlled silane deposition. This allows spatially selective functionalization where different regions can have different chemical properties, enabling precise control over where nucleic acid constructs will bind
Solution Approach 2:
The patent performs preliminary silane modification of the substrate surface before introducing nucleic acid constructs. By pre-establishing the spatial distribution of reactive groups on the surface, the method enables controlled immobilization patterns while ensuring reliable covalent bonding through the subsequent click chemistry reaction
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 method enables efficient and controlled immobilization of nucleic acid constructs on CMOS substrates, providing a stable and efficient surface for molecular detection applications while avoiding interference with oligonucleotide 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
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.