Self-Heating Metal Oxide Gas Sensor for Hydrogen Detection

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Solution Overview

Problem

Existing gas sensors require heating to enhance hydrogen detection sensitivity, leading to high power consumption, which is inefficient and increases energy usage.

Innovation Solution

A gas sensor with a metal-insulator-metal (MIM) lamination structure utilizing self-heating and oxygen-deficient metal oxide layers, where a local area with a higher oxygen deficiency reversibly changes resistance in response to hydrogen-containing gases, reducing power consumption by eliminating the need for a separate heater.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If heating is applied to enhance hydrogen detection sensitivity, then detection sensitivity is improved, but power consumption increases

Engineering Contradiction:

Improvehydrogen detection sensitivityVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The gas sensor utilizes self-heating through resistive heating where the metal oxide layer itself generates the necessary heat for hydrogen detection through its own electrical resistance, eliminating the need for external heating elements and reducing overall power consumption while maintaining detection sensitivity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention changes the electrical resistance parameter of the metal oxide layer to enable self-heating functionality, where the resistance is optimized to generate sufficient heat for hydrogen detection without requiring external heating, thus resolving the contradiction between detection sensitivity and power consumption

Inventive Principle:

Principle #35Parameter changes

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 gas sensor achieves high sensitivity in detecting hydrogen-containing gases while significantly reducing power consumption, maintaining detection capabilities with minimal energy usage.

Implementation Method 1

utilizing self-heating and oxygen-deficient metal oxide layers

Methodology Applied

Scientific EffectSelf-heating: Joule Heating

Implementation Method 2

a local area with a higher oxygen deficiency reversibly changes resistance in response to hydrogen-containing gases

Methodology Applied

Scientific EffectResistive sensing: Electrical Resistance

Data Source

PatentUS10281420B2Gas-detecting apparatus including gas sensor and method of detecting hydrogen using gas sensor

Publication Date: 2019.05.07 PANASONIC SEMICON SOLUTIONS CO LTD

AI summary

A gas-detecting apparatus includes a gas sensor and a power supply circuit. The gas sensor includes: a first electrode; a second electrode; a metal oxide layer disposed between the first electrode and the second electrode; and an insulation film covering the first electrode, the second electrode, and the metal oxide layer. The insulation file having an opening from which a surface of the second electrode is exposed. The resistance value of the metal oxide layer decreases when gas containing hydrogen atoms comes into contact with the second electrode. The power supply circuit applies a predetermined voltage between the first electrode and the second electrode to increase the resistance value of the metal oxide layer before and/or after the decrease in the resistance value of the metal oxide layer.