MEMS Chemical Multisensor for Real-Time Analyte Detection
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Solution Overview
Problem
Current chemical sensing systems, particularly in environmental monitoring and medical diagnostics, face challenges with sensitivity, selectivity, and cost-effectiveness, as they often rely on laboratory-based GC-MS methods that are expensive, time-consuming, and not real-time, while microelectromechanical systems (MEMS) sensors lack the sensitivity and selectivity of GC-MS but offer in-field usability and real-time data.
Innovation Solution
The development of micromachined chemical multisensors that integrate a MEMS resonator with a sensing film and an electronic circuit, including an impedimetric sensor, to simultaneously measure mass and dielectric property changes, providing real-time signals indicative of analyte concentration, and a wearable housing for portable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory-based GC-MS methods are used, then sensitivity and selectivity are improved, but cost and time consumption increase
Solution Approach 1:
The patent combines multiple sensing functions (mass sensing via MEMS resonator and dielectric sensing via impedimetric sensor) into a single integrated sensor device. This merging allows the system to achieve GC-MS level sensitivity and selectivity without requiring separate complex instruments, thereby reducing cost and time while maintaining measurement precision.
Solution Approach 2:
The sensor device performs multiple functions simultaneously: it detects mass changes through MEMS resonator frequency shifts and dielectric property changes through impedimetric sensing. This multi-functionality enables a single device to replace complex GC-MS systems, reducing overall system complexity and operational costs while maintaining high measurement precision.
2Ease of manufacture
If batch-fabricated MEMS sensors are used, then cost and manufacturing efficiency are improved, but sensitivity and selectivity deteriorate
Solution Approach 1:
By integrating both MEMS resonator and impedimetric sensor into a single device, the patent achieves enhanced sensitivity and selectivity that overcomes the limitations of conventional batch-fabricated MEMS sensors. The combined sensing mechanisms provide complementary information that improves measurement precision while maintaining the cost and manufacturing efficiency benefits of batch fabrication.
Solution Approach 2:
The sensor employs composite sensing structures combining MEMS resonator elements with impedimetric electrode configurations. This composite approach leverages the advantages of both sensing technologies to achieve high sensitivity and selectivity in a batch-fabricated device, resolving the trade-off between manufacturing efficiency and measurement precision.
3Device complexity
If single property sensing is used, then device complexity is reduced, but measurement precision and selectivity deteriorate
Solution Approach 1:
The patent merges mass sensing and dielectric sensing capabilities into a single integrated device, allowing simultaneous measurement of multiple properties. This reduces the need for multiple separate sensors and systems, thereby reducing overall device complexity while improving selectivity through the complementary information provided by dual sensing mechanisms.
Solution Approach 2:
The sensor device is designed with universal functionality to detect both mass changes and dielectric property changes simultaneously. This multi-functionality enables a single device to perform what would traditionally require multiple specialized instruments, reducing system complexity while enhancing measurement precision through integrated sensing.
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 enhances sensitivity and selectivity by simultaneously measuring multiple properties from a single sensing film, reducing system complexity and improving orthogonality, while being cost-effective and capable of real-time data processing, thus addressing the limitations of existing technologies.
Implementation Method 1
a sensing film configured to ab/adsorb the analyte
Implementation Method 2
adsorption of the analyte on the sensing film causes the change in a resonant frequency of the sensor
Implementation Method 3
the impedimetric sensor measuring the impedance change of the sensing film when analyte is ab/adsorbed
Data Source
AI summary
Disclosed herein is a chemical sensing system, comprising: a sensor configured to adsorb an analyte; an electronic circuit to operate the sensor; and a microcontroller in communication with the sensor and the electronic circuit. The microcontroller can also be configured to provide a real-time signal indicative of a concentration of the analyte. The sensor can comprise a microelectromechanical system (MEMS) resonator and a sensing film configured to adsorb the analyte, the sensing film coating at least a portion of the sensor. The MEMS resonator can comprise a second sensor, such as an impedimetric sensor to measure at least a second property of the sensing film. The electronic circuit can process signals stemming from at least two properties of the same sensing film, such as the changes in mass and dielectric constant of the same sensing film due to adsorption of analyte.