WO3 Sensor Array with Independent Temperature Control for Gas Selectivity
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Solution Overview
Problem
Existing gas detection methods using chemical sensors, such as those employing Ferroelectric WO3 nanoparticles, require improvements in accuracy for diagnostic applications, particularly for distinguishing between different gas components in bodily excretions.
Innovation Solution
A sensor array using WO3 doped with VPO, thermally coupled to a matrix of resistive heater elements, allows for independent temperature control of each heater element, enabling the selective detection of various gas components by adjusting the operating temperature of individual sensor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single chemical sensor is used for gas detection, then the device complexity is low, but the measurement precision and selectivity for different gas components deteriorates
Solution Approach 1:
The patent divides a single sensor into multiple sensor elements arranged in an array, where each element can independently detect different gas components. This segmentation allows simultaneous detection of multiple gases (improving measurement precision) while keeping each individual sensor element relatively simple in structure
Solution Approach 2:
The patent introduces temperature as an additional dimension for gas detection by heating different sensor elements to different temperatures. This thermal dimensionality enables selective detection of various gas components based on their temperature-dependent reactions, enhancing measurement precision without requiring complex multi-sensor systems
2Measurement precision
If multiple sensor elements are used to detect different gas components, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent uses identical or similar sensor element structures that can detect multiple gas components by varying the operating temperature. This multi-functionality allows the same sensor design to serve multiple detection purposes, improving gas component discrimination while avoiding the complexity of designing and integrating multiple different sensor types
Solution Approach 2:
The patent changes the temperature parameter of sensor elements to achieve selective gas detection. By controlling each sensor element at a specific temperature, the system can selectively detect different gas components, improving measurement precision while maintaining a relatively simple and uniform sensor array structure
3Measurement precision
If sensor elements are heated to different temperatures for selective detection, then the selectivity for different gas components improves, but the energy consumption increases
Solution Approach 1:
The patent employs periodic or sequential heating of sensor elements rather than continuous simultaneous heating of all elements. By cycling through different temperature zones and detecting gases in sequence or using duty-cycled heating, the system maintains high gas component selectivity while significantly reducing overall energy consumption compared to continuous multi-temperature operation
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 the quantitative measurement of gas concentrations in exhaled breath and other bodily fluids, facilitating the diagnosis of medical conditions by enhancing the selectivity and accuracy of gas detection, particularly for biomarkers like ethane and acetone.
Implementation Method 1
a matrix of resistive heater elements, allows for independent temperature control of each heater element
Implementation Method 2
WO 3 doped with VPO can be used as a sensor or sensor array
Implementation Method 3
Based on the selective oxidation catalysis of hydrocarbons, discrimination between biomarkers such as ethane and isoprene may be readily achieved
Implementation Method 4
the dipole moment of a polar molecule can interact with the electric polarization of some ferroelectric domains on the surface. This interaction increases the strength of molecular adsorption on the material surface
Implementation Method 5
The sensor array can be thermally coupled to a heater array such as a one or two dimensional (2D) matrix of resistive heater elements
Data Source
Figure 1
AI summary
The present invention relates to gas sensors using doped ferroelectric materials. The sensors can be fabricated as an array where different portions of the array can operate at different independently controlled temperatures to detect different gas phase components of a gas sample. Preferred embodiments can be used for the diagnosis of conditions, such as, diabetes.