Electrode Functionalization via Potential Bias Control
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Solution Overview
Problem
Current methods for biomolecule functionalization of electrodes, such as dip-coating and top-down approaches, struggle to selectively decorate nearby electrodes with different biomolecules for multi-analyte sensing, often requiring specialized equipment and facing challenges with spatial resolution and alignment as feature sizes decrease.
Innovation Solution
The method involves using electrochemical deposition to control the potential bias on electrodes, allowing only biased electrodes to be decorated with molecules, eliminating cross-talk and enabling simple, fast, and tunable functionalization of multiple electrodes without specialized equipment, applicable to various shapes and 3D orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dip-coating or drop-coating methods are used for biomolecule functionalization, then the process is simple and fast, but selective decoration of nearby electrodes with different biomolecules cannot be achieved
Solution Approach 1:
The patent applies local quality by making each electrode's surface properties unique through individual potential control. Each electrode can be biased at different potentials to create distinct local environments that selectively attract specific biomolecules, enabling spatially resolved functionalization without complex equipment
Solution Approach 2:
The patent changes the electrical potential parameter of each electrode independently to control biomolecule deposition. By adjusting the potential bias of individual electrodes, the system achieves selective functionalization - electrodes at certain potentials attract positively charged biomolecules while repelling negatively charged ones, enabling precise spatial control
2Manufacturing precision
If top-down approaches such as dip pen lithography are used, then spatial patterning can be achieved, but highly specialized equipment and alignment challenges are required
Solution Approach 1:
The patent applies self-service by using the electrodes themselves to direct the functionalization process. The electrodes' own electrical properties are exploited to attract and position biomolecules, eliminating the need for external alignment equipment or master templates. The system uses the substrate's inherent characteristics to guide the deposition process
Solution Approach 2:
The patent replaces mechanical alignment systems with electrical field control. Instead of using physical masks, pens, or alignment equipment, the system uses electrical potential gradients to guide biomolecule deposition, substituting complex mechanical positioning with simpler electrical control
3Manufacturing precision
If bottom up approaches relying on chemical selectivity are used, then spatially controlled deposition can be achieved, but the number of unique sensors that can be created in a small space is limited
Solution Approach 1:
The patent applies dynamics by making the electrode surfaces dynamically controllable through real-time potential adjustment. Each electrode's charge state can be changed on demand, allowing the same physical surface to selectively bind different biomolecules at different times, greatly increasing the variety of sensors that can be created from a fixed array of electrodes
Solution Approach 2:
The patent makes each electrode universal by enabling it to perform multiple functions through potential control. The same electrode can attract different types of biomolecules depending on its applied potential, allowing a single electrode array to serve as multiple different sensors for detecting various analytes
4Reliability
If chemical coupling methods are used for biomolecule immobilization, then specific coupling chemistry can be achieved, but the method is limited to specific electrode materials and biomolecule types
Solution Approach 1:
The patent changes the electrical potential parameter to control biomolecule deposition, replacing chemistry-specific coupling methods with a universal electrical control mechanism. This allows the same approach to work with different electrode materials and biomolecule types, as long as they respond to electrical fields
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 allows for controlled and selective immobilization of biomolecules on nearby electrodes, achieving high sensitivity and selectivity for multi-analyte sensing with no cross-talk between electrodes, enabling efficient detection of analytes and concentration gradient mapping in 3D space.
Implementation Method 1
The methods of the invention involve controlling the potential bias on proximate electrodes. A plurality of electrode tips are exposed to a medium containing a molecule (e.g., a biomolecule), and only the electrode that is biased during exposure to the medium is decorated with the molecule.
Implementation Method 2
cyclic voltammetry using a three electrode setup. The application of voltage to the first electrode initiates a polymerization reaction at only the first electrode that results in production of a layer of the electrically conductive material including the first molecule on only the first electrode.
Data Source
AI summary
The invention generally relates to sensors, methods of manufacture thereof, methods of use thereof for sensing analytes, such as small molecules and biomolecules, and methods of immobilization. In certain embodiments, the invention provides a multi-analyte sensor. The multi-analyte sensor includes a plurality of sensing electrodes. Each sensing electrode is functionalized with a different molecule (e.g., biomolecule), at least two of the sensing electrodes are spaced apart prior to and after functionalization by 100 μm or less, and there is no cross-talk between the plurality of sensing electrodes.