Hydrogen Sulfide Sensor Nanocomposite Reversible Detection

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Solution Overview

Problem

Existing hydrogen sulfide sensors using conducting-polymer mechanisms irreversibly react with hydrogen sulfide, making them non-reusable and limited to single-use dosimeters, and they are ineffective at elevated temperatures.

Innovation Solution

A hydrogen sulfide sensor with interdigitated electrodes and a nanocomposite sensing layer comprising polyaniline, a metal salt, and an isolator polymer or clay, which allows for reversible detection and operation at room temperature to 250°C without reacting with the metal salt, enabling reusable sensors and improved temperature range capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conducting-polymer sensors are used to detect hydrogen sulfide, then detection capability is achieved, but the sensor becomes non-reusable due to irreversible reaction

Engineering Contradiction:

Improvesensor reusabilityVSAvoidchemical reversibility

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent introduces an intermediary mechanism where the conducting polymer mediates between hydrogen sulfide detection and electrode protection. The polymer reacts reversibly with H2S to form a complex that can dissociate, preventing direct irreversible reaction between H2S and the metal electrodes, thus enabling sensor reusability while maintaining detection capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent utilizes parameter changes in the conducting polymer's oxidation state and conformation in response to hydrogen sulfide exposure. The polymer undergoes reversible transitions between conductive and less conductive states, allowing the sensor to reset and be reused after detection cycles by controlling environmental parameters such as temperature and exposure conditions

Inventive Principle:

Principle #35Parameter changes

2Temperature

If conducting-polymer sensors are used for hydrogen sulfide detection, then detection function is provided, but operation at elevated temperatures is ineffective

Engineering Contradiction:

Improveoperating temperature rangeVSAvoiddetection effectiveness

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent employs composite material design combining conducting polymer with metal salts and isolator polymers or clay. This composite structure maintains the detection sensitivity of the conducting polymer while the metal salt and isolator components provide thermal stability, enabling effective operation across an extended temperature range from room temperature to 250°C

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality enhancement by incorporating metal salts and isolator polymers specifically in regions where thermal stability is needed, while preserving the conducting polymer's detection functionality in contact with hydrogen sulfide. This localized functional distribution allows the sensor to operate reliably at elevated temperatures without sacrificing detection capability

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If nanocomposite sensing layer is used, then reversible detection and wide temperature range are achieved, but device complexity increases

Engineering Contradiction:

Improvetemperature range and reversibilityVSAvoidnanocomposite structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple functional components (conducting polymer, metal salt, isolator polymer/clay) into a single integrated nanocomposite sensing layer. This combining approach achieves reversible detection and wide temperature range functionality while simplifying the overall device structure compared to using separate components, as the nanocomposite can be applied as a unified coating on the interdigitated electrodes

Inventive Principle:

Principle #5Merging (Combining)

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 sensor provides reversible hydrogen sulfide detection and enhanced sensitivity across a wide temperature range, allowing for both disposable and reusable configurations, addressing the limitations of existing sensors by maintaining functionality and sensitivity in the presence of hydrogen sulfide.

Implementation Method 1

a nanocomposite based sensing layer in electrical contact with the interdigitated electrodes and configured to interact with hydrogen sulfide

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

The hydrogen sulfide sensor can incorporate a polymer, such as polyaniline, capable of detecting hydrogen sulfide at room temperature as well as elevated temperatures

Methodology Applied

Scientific EffectConductivity change: Conduction (electrical)

Implementation Method 3

dispersing, by sonication, synthesized polyaniline nanofibers within the first dispersion to form a second dispersion, suspending, by sonication, a metal salt solution in the second dispersion to form a suspension

Methodology Applied

Scientific EffectSonication: Ultrasonic Vibration

Data Source

PatentUS9932449B2Hydrogen sulfide sensor and method

Publication Date: 2018.04.03 HONEYWELL ROMANIA

AI summary

A hydrogen sulfide sensor is disclosed. The hydrogen sulfide sensor includes a substrate, a pair of interdigitated electrodes supported by the substrate, and a nanocomposite based sensing layer deposited on the interdigitated electrodes and configured to interact with hydrogen sulfide.