Silane-Modified Microchip Surfaces for Biosensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Silicon or glass substrates used in electrochemical biosensing devices are prone to biomolecule adsorption and surface contamination, leading to variable surface wetting and undesirable effects during electrochemical sensing, due to their porosity and isoelectric points mismatch with sensing solutions.
Innovation Solution
A process involving the application of an insulating layer of silicon dioxide or silicon nitride, followed by oxidation and reaction with functionalized silanes to create a self-assembled monolayer, which modifies the surface hydrophobicity and reduces biomolecule binding, thereby stabilizing the surface for nanostructured microelectrode deposition and electrochemical detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon dioxide or silicon nitride insulating layers are applied to substrates, then electrical insulation is improved, but surface porosity increases leading to biomolecule adsorption and trapping
Solution Approach 1:
The patent applies different surface treatments to different regions of the substrate. The insulating layers maintain their electrical insulation function while the exposed substrate surfaces receive silane modification to create hydrophobic regions that prevent biomolecule adsorption. This local differentiation allows each region to optimize its specific function.
Solution Approach 2:
The patent creates a composite surface structure combining the insulating silicon dioxide or silicon nitride layers with organosilane-coated regions. This composite approach integrates the electrical insulation properties of the inorganic insulating layer with the anti-adsorption properties of the organic silane coating, achieving both functions simultaneously.
2Manufacturing precision
If standard lithographic substrates are used, then manufacturing precision is improved, but surface wetting becomes variable due to surface contaminants and residues
Solution Approach 1:
The patent changes the surface energy parameters of the substrate by applying silane coatings. This modification alters the contact angle and wetting properties of the surface, creating consistent hydrophobic regions that prevent variable wetting behavior. The silane treatment standardizes surface properties across different manufacturing batches.
Solution Approach 2:
The patent performs silane modification as a preliminary surface treatment step before probe deposition and assay procedures. This preliminary action prepares the surface in advance to ensure consistent wetting behavior and prevent contamination during subsequent steps, eliminating the need for repeated surface conditioning.
3Ease of operation
If electrolyte solution penetrates to underlying substrate layers, then electrochemical sensing is enabled, but undesirable effects occur during sensing
Solution Approach 1:
The patent introduces silane-modified surface regions as an intermediary layer between the electrolyte solution and the underlying substrate. This intermediary layer allows controlled electrolyte access for electrochemical sensing while preventing direct penetration to underlying layers, thereby mediating the interaction to eliminate harmful effects.
4Adaptability or versatility
If multiple probe-containing droplets are deposited on a single chip, then functionalization of individual NMEs is achieved, but wicking effects and solution spreading occur due to inconsistent hydrophobicity
Solution Approach 1:
The patent creates distinct hydrophobic regions on the chip surface through selective silane modification. These localized hydrophobic zones act as defined deposition areas that confine droplet placement and prevent spreading to adjacent regions, enabling precise functionalization of individual nanostructured microelectrodes with unique probes.
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 modified surface provides a consistent hydrophobic environment, preventing solution spreading and contamination, enhancing the precision and reliability of probe deposition and assay performance in biosensing devices.
Implementation Method 1
allowing one or more of the oxidized silicon dioxide or silicon nitride to react with a functionalized silane
Implementation Method 2
allowing one or more of the oxidized silicon dioxide or silicon nitride to react with a functionalized silane
Implementation Method 3
etching the surface to clean and/or oxidize the surface
Data Source
AI summary
Disclosed herein are processes and devices for use in the electrochemical detection of a target in a sample. For example, silicon or glass surfaces are treated with silanes functionalized with various side chains to tune the surface wetting characteristics.