Acoustic resonator devices and methods providing patterned functionalization areas
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Solution Overview
Problem
Existing acoustic resonator devices face challenges in operating effectively in liquid environments due to issues like corrosion of reactive metal electrodes, excess functionalization material impairing sensor response, and difficulties in achieving precise placement and alignment of functionalization materials, which complicates biosensing and biochemical sensing applications.
Innovation Solution
A micro-electromechanical system (MEMS) resonator device is developed with a piezoelectric material layer, an interface layer, and a self-assembled monolayer (SAM) for functionalization, where less than the entirety of the piezoelectric material is overlaid with interface layer material to receive a SAM, and a patterned blocking layer is used to control the placement of functionalization materials, enhancing dimensional tolerance and avoiding unwanted binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If functionalization material is applied to enhance sensor sensitivity, then detection capability is improved, but excess functionalization material impairs sensor response and causes unwanted binding
Solution Approach 1:
The patent applies local quality by creating distinct regions on the piezoelectric material surface: an active region with interface layer and SAM for functionalization material binding, and a non-active region without interface layer. This spatial differentiation ensures functionalization material is deposited only where needed, preventing excess material from impairing sensor response while maintaining high detection capability in the active region.
2Measurement precision
If blocking techniques are used to prevent unwanted binding, then specific binding is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent implements preliminary action by pre-forming the interface layer and self-assembled monolayer (SAM) on the piezoelectric material surface during fabrication, before the device is put into service. This preliminary structuring creates inherent spatial selectivity that guides functionalization material to the correct location, eliminating the need for complex blocking techniques during operation and simplifying both device complexity and manufacturing.
3Reliability
If reactive metal electrodes are used in liquid environments, then electrical conductivity is improved, but corrosion occurs reducing reliability
Solution Approach 1:
The patent introduces an interface layer as an intermediary between the reactive metal electrodes and the liquid environment. This interface layer, combined with the self-assembled monolayer (SAM), acts as a protective barrier that prevents direct contact between the reactive metal electrodes and corrosive liquids, thereby maintaining electrical conductivity while preventing corrosion and improving reliability in liquid environments.
4Manufacturing precision
If functionalization material placement precision is improved, then sensor response is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent replaces mechanical placement methods (such as manual spotting or complex alignment systems) with a chemical self-assembly approach. The interface layer and self-assembled monolayer (SAM) provide a chemically active surface that automatically binds functionalization material in the correct location through chemical affinity, achieving high manufacturing precision without increasing manufacturing complexity.
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 solution enables stable operation of acoustic resonator devices in liquid environments, improves sensor response by precise placement of functionalization materials, and simplifies manufacturing by reducing the need for cumbersome blocking techniques, thereby enhancing the reliability and efficiency of biosensing and biochemical sensing applications.
Implementation Method 1
A micro-electromechanical system (MEMS) resonator device is developed with a piezoelectric material layer
Implementation Method 2
a self-assembled monolayer (SAM) for functionalization
Data Source
AI summary
A micro-electrical-mechanical system (MEMS) resonator device includes a top side electrode overlaid with an interface layer including a material having a surface (e.g., gold or other noble metal, or a hydroxylated oxide) that may be functionalized with a functionalization (e.g., specific binding or non-specific binding) material. The interface layer and/or an overlying blocking material layer are precisely patterned to control locations of the interface layer available to receive a self-assembled monolayer (SAM), thereby addressing issues of misalignment and oversizing of a functionalization zone that would arise by relying solely on microarray spotting. Atomic layer deposition may be used for deposition of the interface layer and/or an optional hermeticity layer. Sensors and microfluidic devices incorporating MEMS resonator devices are also provided.