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Related Experiment Video

Updated: Jul 1, 2026

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

Published on: November 15, 2016

Sub-ppm Methane Sensing by Spark-Ablation-Synthesized Nano-SnO₂.

Dimitris Gounaris¹, Adrien Baut², Loucas Georgiou¹

¹Climate and Atmosphere Research Center, The Cyprus Institute, Nicosia 2121, Cyprus.

|March 5, 2026

Summary

This summary is machine-generated.

New nanoparticle-based sensors accurately detect low methane concentrations, crucial for environmental safety. These advanced tin oxide sensors offer high sensitivity and stability for real-world applications.

Keywords:

aerosol-based synthesis metal oxide gas sensors nanomaterials nanoparticles thin films

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

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Published on: July 26, 2024

Area of Science:

Materials Science
Environmental Sensing
Nanotechnology

Background:

Methane is a clean energy source but poses environmental and safety risks due to accidental releases.
Advanced sensing technologies are needed to monitor methane concentrations in ambient air.
Existing metal oxide semiconductor materials have limitations in sensitivity and stability.

Purpose of the Study:

To develop nanoparticle-based materials for sensitive and robust methane detection.
To investigate the correlation between nanoparticle synthesis parameters and sensor performance.
To provide a reliable sensing solution for environmental and industrial methane monitoring.

Main Methods:

Synthesis of tin oxide (SnO2) nanoparticles via spark ablation of tin electrodes in N2 flow.
Oxidation of tin nanoparticles (Sn NPs) by thermal annealing.
Fabrication of sensors by doctor blading SnO2 NPs onto interdigitated electrodes.
Material characterization using XRD, XPS, BET, and electron microscopy techniques.
Gas sensing measurements to quantify methane concentrations and assess sensor performance.

Main Results:

Quantification of methane concentrations down to 0.2 ppm with a signal-to-noise ratio of 58.
Theoretical limit of detection of approximately 7 ppb for methane.
Excellent robustness across a wide relative humidity range (20-80%) and high cycling stability.
Demonstrated correlation between spark-ablation energy, NP size, and sensor sensitivity.

Conclusions:

The developed SnO2 nanoparticle-based sensors exhibit superior performance compared to existing materials.
The synthesis process significantly influences sensor sensitivity, offering a pathway for optimization.
These sensors are highly promising for environmental monitoring and industrial safety applications due to their sensitivity, stability, and ease of preparation.