Graphene Oxide Membrane Ionizer for VOC Detection
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Solution Overview
Problem
Current methods for analyzing volatile organic compounds (VOCs) and trace gases in breath analysis and environmental monitoring are limited in their ability to efficiently ionize and detect these compounds, particularly in gas mixtures containing water molecules.
Innovation Solution
An apparatus and method utilizing a graphene oxide membrane to generate hydronium ions from water, which are then used to ionize molecules in a gas mixture, followed by detection using an ion detector, allowing for the separation of ions based on their mobility without the need for a separate drift region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional ionization methods are used for VOC detection, then ionization capability is achieved, but device complexity and size increase due to required drift regions and multiple components
Solution Approach 1:
The patent combines the ionization function and drift region function into a single membrane component. The membrane simultaneously generates ions from water molecules and provides the drift region for ion separation, eliminating the need for separate drift region chambers and reducing overall device complexity while maintaining reliable ionization capability for VOC detection
Solution Approach 2:
The membrane is designed to perform multiple functions: it acts as both the ionization medium (generating ions from water) and the drift region (enabling ion separation based on mobility). This multi-functional design reduces the number of components needed while ensuring reliable detection of volatile organic compounds
2Measurement precision
If traditional mass spectrometry systems are used, then measurement precision is achieved, but device portability and cost-effectiveness deteriorate
Solution Approach 1:
The patent extracts and eliminates unnecessary components from traditional mass spectrometry systems, retaining only the essential functions (ionization and detection) implemented through the membrane structure. This extraction of core functionality enables portable and cost-effective VOC detection while maintaining measurement precision through the membrane's inherent ion generation and separation capabilities
Solution Approach 2:
The membrane-based ionizer represents a simplified, potentially disposable or easily replaceable component that replaces complex, expensive traditional ionization systems. This approach enables portable devices with lower manufacturing costs while maintaining sufficient measurement precision for breath analysis and environmental monitoring applications
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 enables efficient ionization and detection of VOCs in gas mixtures, including those with water, providing a compact, cost-effective, and portable solution for analyzing VOCs in breath and environmental samples.
Implementation Method 1
an ionizer for supplying hydronium ions to the received gas mixture to generate ions, wherein the ionizer comprises a membrane for receiving the gas mixture, wherein the membrane is capable of generating hydronium ions from water
Implementation Method 2
contacting a gas mixture with the hydronium ions for generating ions of molecules comprised in the gas mixture
Data Source
AI summary
Apparatus comprising an inlet region for receiving a gas mixture; an ionizer for supplying hydronium ions to the received gas mixture to generate ions, wherein the ionizer comprises a membrane for receiving the gas mixture, and wherein the membrane, preferably made of graphene oxide, is capable of generating hydronium ions from water; and an ion detector for detecting ions generated from the gas mixture.