GFET Sensor Array with Organic Probes for ppb Gas Detection
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Solution Overview
Problem
Current gas detection methods struggle to accurately and rapidly detect extremely low concentrations of gas components, such as those in the ppb to ppt range, due to limitations in sensitivity and portability, and are often hindered by interference from impurities and the need for large, expensive equipment.
Innovation Solution
A molecular detection apparatus featuring a collection unit, a detector with multiple detection cells equipped with graphene field effect transistors (GFETs) and organic probes of varying reactivity, and a discriminator that utilizes pattern recognition to differentiate signal intensities and improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large equipment such as gas chromatography or mass spectrometer is used to detect extremely low concentration gas components, then detection sensitivity is improved, but device weight and volume increase
Solution Approach 1:
The patent divides the detection system into multiple independent detection cells, each equipped with GFET sensors and specific organic probes. This segmentation allows the system to achieve high detection sensitivity through parallel processing of multiple gas components while maintaining a compact overall structure that is much smaller than traditional gas chromatography or mass spectrometer systems.
2Ease of operation
If simple measurement method using biological reaction mechanism is used for direct measurement on the go, then portability is improved, but detection accuracy and reliability deteriorate
Solution Approach 1:
The patent replaces biological reaction mechanisms with a physical-chemical detection system based on GFET sensors and organic probes. This substitution eliminates the problems associated with biological systems (storage life, temperature management) while maintaining portability and achieving high detection accuracy through the electronic measurement of electrical conductivity changes when target gases adhere to the sensor surfaces.
3Device complexity
If detection element with single type of organic substance modification is used, then device complexity is reduced, but detection accuracy deteriorates due to interference from impurities
Solution Approach 1:
The patent applies different types of organic probes to different detection cells, creating local specialization. Each detection cell is equipped with organic probes that have specific affinity for particular gas components. This local quality differentiation allows the system to accurately detect target gases even in the presence of impurities, as each cell responds selectively to its target analyte.
Solution Approach 2:
The patent uses a composite detection system combining GFET sensors with various organic probe materials (such as porphyrin derivatives, crown ethers, and other functional organic compounds). This composite approach leverages the unique properties of different organic materials to achieve broad-spectrum detection capability with high selectivity for different gas components.
4Measurement precision
If multiple types of organic probes with different reactivity are used in detection cells, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection system into multiple independent detection cells, where each cell contains GFET sensors modified with specific organic probes. This segmentation allows for parallel detection of multiple gas components without requiring complex signal processing, as each cell independently measures its target gas. The overall system achieves high detection accuracy through this modular architecture while maintaining manageable 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
Enables selective and highly sensitive detection of gas molecules at extremely low concentrations, reducing interference from impurities and miniaturizing the detection apparatus for improved portability and reliability.
Implementation Method 1
an element has been known that has a conductive layer in which a surface of a carbon nanostructure is surface modified with an organic substance or the like that selectively reacts with or adsorbs a specific substance
Implementation Method 2
measures a potential difference or the like that changes depending on the gas component that has adhered to the surface of the carbon nanostructure
Data Source
AI summary
A molecular detection apparatus according to an embodiment includes: a collection unit collecting detection target gas containing molecules to be detected; a detector including a plurality of detection cells each having an organic probe disposed at a sensor unit, the organic probe capturing the molecules collected in the collection unit; and a discriminator discriminating the molecules by a signal pattern based on an intensity difference of detection signals generated by the molecules being captured by the organic probes in a plurality of the detection cells. In the molecular detection apparatus according to the embodiment, at least one of the detection cells has a plurality of different types of the organic probes disposed at the sensor unit.