3D BAW Sensor Surface Structure for Faster Analyte Binding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional biochemical sensing devices face limitations in consistent analyte distribution and low analyte binding rates due to laminar flow in microfluidic channels, which slows down the measurement process.
Innovation Solution
A micro-electrical-mechanical system (MEMS) resonator device with a piezoelectric material and a patterned enhanced surface area element is used, increasing the sensor surface area and reducing analyte diffusion distance, and promoting passive mixing of analyte-containing fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional planar sensor surfaces are used, then device complexity is low, but sensor surface area is limited and analyte binding rate is low
Solution Approach 1:
The patent transforms the planar two-dimensional sensor surface into a three-dimensional structured surface by adding vertical elements (posts, pillars, or recesses) to the electrode. This dimensional transition increases the available surface area for analyte binding without significantly complicating the fabrication process, as the three-dimensional features are integrated into the existing electrode structure during standard MEMS manufacturing steps.
2Productivity
If laminar flow is used in microfluidic channels, then flow control is simple, but analyte distribution consistency is poor and binding rate is slow
Solution Approach 1:
The patent segments the continuous planar electrode surface into multiple discrete three-dimensional elements (such as arrays of posts or pillars). This segmentation creates multiple localized binding sites that can simultaneously capture analytes from different parts of the flowing sample, increasing the overall binding rate and improving the consistency of analyte distribution across the sensor surface during laminar flow conditions.
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 configuration enhances the capture of analytes, improving sensor performance by increasing the binding rate and reducing measurement time.
Implementation Method 1
a piezoelectric material arranged between a top side electrode and a bottom side electrode
Implementation Method 2
at least one patterned enhanced surface area element arranged between a lower surface of the top side electrode and the functionalization material. The at least one patterned enhanced surface area element is configured to increase non-planarity of the functionalization material, thereby providing a three-dimensional structure configured to increase sensor surface area
Implementation Method 3
reducing analyte diffusion distance to improve sensor performance by enabling capture of an increased amount of analyte
Data Source
AI summary
A bulk acoustic wave MEMS resonator device includes at least one functionalization (e.g., specific binding or non-specific binding) material arranged over a top side electrode, with at least one patterned enhanced surface area element arranged between a lower surface of the top side electrode and the functionalization material. The at least one patterned enhanced surface area element increases non-planarity of the at least one functionalization material, thereby providing a three-dimensional structure configured to increase sensor surface area and reduce analyte diffusion distance, and may also promote fluid mixing. Methods for biological and chemical sensing, and methods for forming MEMS resonator devices and fluidic devices are further disclosed.