Plasmonic Gas Sensor Separating Layer Design
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Solution Overview
Problem
Current gas sensors are large, costly, and difficult to scale down, making them inefficient for reliable and robust gas detection, particularly for gases like carbon dioxide.
Innovation Solution
A compact gas sensor design featuring a plasmonic sensor layer with a gas permeable sensing layer and an impermeable separating layer, allowing for localized surface plasmon resonance detection without direct contact, enhancing sensitivity and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laboratory analytical equipment or traditional gas sensors are used, then gas detection capability is achieved, but device size is large and cost is high
Solution Approach 1:
The patent replaces conventional mechanical/optical gas sensing systems with a plasmonic nanoparticle-based system. The localized surface plasmon resonance (LSPR) effect allows direct optical detection of gas molecules at the nanoparticle surface, eliminating the need for large-scale optical components or complex mechanical structures while maintaining high detection sensitivity
Solution Approach 2:
The patent changes the detection parameter from bulk optical properties to surface plasmon resonance characteristics of nanoparticles. By monitoring shifts in LSPR wavelength or intensity caused by gas adsorption at the nanoparticle surface, the system achieves miniaturization while preserving detection capability
2Reliability
If conventional gas sensors are used, then gas detection is achieved, but device complexity and cost are high
Solution Approach 1:
The patent replaces complex conventional sensing mechanisms with the plasmonic LSPR effect, which provides direct optical readout of gas presence. This substitution simplifies the instrumentation by eliminating intermediate conversion steps or complex signal processing requirements
Solution Approach 2:
The plasmonic nanoparticles inherently provide both the sensing function and the optical response mechanism. The LSPR effect automatically generates a detectable optical signal when gas molecules interact with the nanoparticle surface, eliminating the need for external actuators or complex measurement systems
3Measurement precision
If sensing layer is in direct contact with plasmonic sensor, then sensitivity is improved, but sensor stability and reliability deteriorate due to direct exposure
Solution Approach 1:
The patent introduces a porous sensing layer as an intermediary between the gas environment and the plasmonic nanoparticles. This layer allows gas molecules to reach the sensor surface while protecting the nanoparticles from direct exposure to harsh conditions, thus maintaining both sensitivity and stability
Solution Approach 2:
The patent employs a porous sensing layer that provides high surface area for gas interaction while acting as a protective matrix. The porous structure allows gas diffusion to the plasmonic nanoparticle surface for sensitive detection, while the material matrix protects the nanoparticles from degradation
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 solution provides a more reliable, stable, and cost-effective gas sensor with improved sensitivity and selectivity, enabling efficient detection of various gases, including carbon dioxide, through changes in localized surface plasmon resonance conditions.
Implementation Method 1
a sensor layer comprising a plasmonic sensor provided so as to allow, upon illumination with electromagnetic radiation a localized surface plasmon resonance condition
Data Source
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AI summary
The present invention relates to a gas sensor comprising a sensor layer (100) comprising a plasmonic sensor (102) provided so as to allow, upon illumination with electromagnetic radiation a localized surface plasmon resonance condition, a sensing layer (106) comprising a gas permeable material that, when exposed to a gas, modifies the localized surface plasmon resonance condition, a separating layer (104) arranged in between the sensor layer (100) and the sensing layer (106) such that the plasmonic sensor (102) is separated from the sensing layer (106). A gas sensing system and a method for sensing a presence of a gas is further disclosed.