MEMS Acoustic Resonator Functionalization for Low-Concentration Biosensing
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Solution Overview
Problem
MEMS resonator-based biosensors face challenges in achieving high sensitivity for detecting analytes at low concentrations due to non-uniform sensitivity over the sensor surface and excess functionalization material leading to undesirable analyte binding, especially when analyte-containing fluids flow parallel to the sensor surface.
Innovation Solution
A MEMS resonator device with functionalization material applied only over the central portion of the top side electrode, optimizing its dimensions and configuration to enhance sensitivity, and directing the analyte flow to interact primarily with the most sensitive regions, thereby reducing binding in less sensitive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If functionalization material is applied over the entire top side electrode, then the sensor coverage is maximized, but the sensitivity is reduced due to non-uniform sensitivity distribution and binding in less sensitive peripheral areas
Solution Approach 1:
The patent applies functionalization material selectively only to the central portion of the top side electrode where the acoustic wave exhibits maximum sensitivity, rather than uniformly across the entire electrode surface. This creates a non-uniform distribution of functionalization material that matches the non-uniform sensitivity profile of the acoustic wave, thereby maximizing detection sensitivity while minimizing binding in less sensitive peripheral areas.
2Quantity of substance
If functionalization material is applied over the entire electrode surface, then the binding capacity is increased, but false positives increase due to binding in regions of low sensitivity
Solution Approach 1:
The patent concentrates functionalization material in the central high-sensitivity region, creating a localized binding zone that generates a stronger, more reliable signal. By eliminating functionalization material from peripheral low-sensitivity areas, the patent prevents weak, unreliable binding events that would contribute to false positives, thereby improving signal accuracy and reliability.
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 increases the signal change from smaller mass adsorption, improving the detection sensitivity and reducing false positives by focusing analyte binding on the most sensitive areas of the sensor, especially when dealing with low-concentration analytes.
Implementation Method 1
A bulk acoustic wave resonator structure arranged over at least a portion of the substrate and including a piezoelectric material
Implementation Method 2
any changes to the characteristics of the propagation path affect the velocity and/or amplitude of the wave
Data Source
AI summary
A micro-electrical-mechanical system (MEMS) resonator device includes at least one functionalization material arranged over at least a central portion, but less than an entirety, of a top side electrode. For an active region exhibiting greatest sensitivity at a center point and reduced sensitivity along its periphery, omitting functionalization material over at least one peripheral portion of a resonator active region prevents analyte binding in regions of lowest sensitivity. The at least one functionalization material extends a maximum length in a range of from about 20% to about 95% of an active area length and extends a maximum width in a range of from about 50% to 100% of an active area width. Methods for fabricating MEMS resonator devices are also provided.