Noble Metal Nanoparticle Gas Sensor for Multi-Gas Selectivity
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Solution Overview
Problem
Existing semiconductor-based resistive gas sensors face challenges in selectively detecting multiple gases due to cross-sensitivity issues, limiting them to dual-function gas selectivity, and current methods for achieving multi-gas selectivity involve large, complex devices with high energy consumption and safety hazards.
Innovation Solution
A noble metal nanoparticle modification layer is formed on the surface of a semiconductor gas-sensitive material layer to enhance gas selectivity, allowing a single probe to detect at least three gases within a 0-400°C temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple gas sensor elements with different sensitive characteristics are integrated into an array to detect more than two gases, then gas selectivity is improved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple gas sensing functions into a single probe by integrating a semiconductor gas-sensitive material layer with a noble metal nanoparticle modification layer. This merging approach enables one probe to selectively detect multiple gases (at least three types) through the synergistic interaction between the semiconductor layer and noble metal nanoparticles, eliminating the need for multiple separate sensor elements and complex data analysis systems.
Solution Approach 2:
The patent employs composite material structure consisting of semiconductor gas-sensitive material (such as metal oxide semiconductors) combined with noble metal nanoparticles (such as gold, silver, platinum, or palladium). This composite structure creates new sensing properties that enable selective detection of multiple gases within a broad temperature range (0-400°C), achieving enhanced gas selectivity without increasing device complexity.
2Adaptability or versatility
If temperature regulation range is increased to achieve dual-function gas selectivity, then gas selectivity is improved, but energy consumption and safety hazards increase
Solution Approach 1:
The patent utilizes parameter changes by controlling the operating temperature within a broad range (0-400°C) to achieve selective detection of different gases. The noble metal nanoparticle modification layer enables the sensor to exhibit different sensing characteristics at different temperatures, allowing selective response to various gases without requiring extreme temperature changes or high energy input.
Solution Approach 2:
The patent applies local quality by creating a noble metal nanoparticle modification layer on the surface of the semiconductor gas-sensitive material layer. This localized modification introduces specific catalytic and sensing properties at the surface level, enabling the material to selectively interact with different gas molecules at different temperatures within the 0-400°C range, thereby achieving multi-gas selectivity with reduced energy consumption.
3Device complexity
If a single probe is used to detect multiple gases through temperature regulation, then device complexity is reduced, but gas selectivity is limited to at most two gases
Solution Approach 1:
The patent employs composite material structure consisting of semiconductor gas-sensitive material (such as metal oxide semiconductors) combined with noble metal nanoparticles (such as gold, silver, platinum, or palladium). This composite structure creates new sensing properties that enable selective detection of multiple gases within a broad temperature range (0-400°C), achieving enhanced gas selectivity without increasing device complexity.
Solution Approach 2:
The patent utilizes parameter changes by controlling the operating temperature within a broad range (0-400°C) to achieve selective detection of different gases. The noble metal nanoparticle modification layer enables the sensor to exhibit different sensing characteristics at different temperatures, allowing selective response to various gases without requiring extreme temperature changes or high energy input.
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
The method improves gas selectivity and expands the types of gases detectable, enabling selective detection of at least three gases with a single probe, reducing energy consumption and safety risks.
Implementation Method 1
forming a noble metal nanoparticle modification layer on the surface of a semiconductor gas-sensitive material layer... enabling selectively detection of at least three gases
Implementation Method 2
The principle of semiconductor-based resistive gas sensor for detecting gases is that the gases are adsorbed and reacted on their surfaces and caused their resistance change
Data Source
AI summary
Disclosed in the present application are a method for increasing gas selection functions of a multifunctional gas sensor, and a gas sensor. The method for increasing gas selection functions of a multifunctional gas sensor of the present application comprises: forming a noble metal nanoparticle modification layer on a surface of a semiconductor gas-sensitive material layer of a probe of a gas sensor, such that a single probe of the gas sensor can implement the selective detection and selective regulation of at least three gases in an operating temperature range of 0-400° C.