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Related Experiment Video

Updated: Aug 8, 2025

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

Published on: July 26, 2024

Study on SAW Methane Sensor Based on Cryptophane-A Composite Film.

Xinlei Liu¹, Bin Shen¹, Leiming Jiang¹

¹School of Safety Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China.

|February 25, 2023

Summary

This study introduces a novel Surface Acoustic Wave (SAW) methane sensor utilizing a graphene-nickel composite film for room-temperature detection. The developed sensor demonstrates excellent response and recovery, showing promise for accurate methane monitoring.

Keywords:

Cryptophane-A SAW composite membrane methane detection performance

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Published on: January 7, 2019

Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Surface Acoustic Wave (SAW) sensors offer a promising avenue for methane detection.
Optimizing sensitive film materials and structures is crucial for enhancing SAW sensor performance.
Room-temperature methane sensing remains a significant challenge in sensor development.

Purpose of the Study:

To propose and develop a novel SAW methane sensor employing a graphene-nickel composite film.
To investigate the sensor's performance at room temperature across various methane concentrations.
To provide a theoretical foundation for advanced SAW methane sensor development.

Main Methods:

Design of a delay linear dual-channel differential oscillator with a 204.3 MHz center frequency.
Preparation of Cryptophane-A material using a "three-step method".
Synthesis of the composite sensitive film via drop coating, electrochemical deposition, and electroplating, followed by SEM characterization.

Main Results:

The sensor exhibited good response and recovery performance within the 0-5% CH4 concentration range.
A positive correlation was observed between frequency offset and methane concentration.
The sensor achieved a 90% average response time of 41.2 s, recovery time of 57 s, and sensitivity of 809.4 ± 6.93 Hz/(1% CH4).

Conclusions:

The developed graphene-nickel composite film enables effective room-temperature methane detection using SAW technology.
The sensor's performance metrics indicate its potential for practical methane monitoring applications.
This research lays a strong theoretical groundwork for future advancements in SAW-based methane sensors.