Posted in | News | Gas Sensor

Self-Heating E-Nose Revolutionizes Gas Detection

A recent study published in ACS Sensors highlights the development of a smart electronic nose, or e-nose, by a research team headed by Prof. Meng Gang from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences.

Self-Heating E-Nose Revolutionizes Gas Detection

Smart E-nose system based on self-heating temperature modulation. Image Credit: Li Meng

The new e-nose can distinguish between various target gas molecule types in less than a second thanks to its self-heating modulation technique.

Using e-nose, which consists of non-selective semiconductor gas sensors, significant advancements have been made in the detection of gas molecules. The ability to extract sufficient molecular features in less than a second is still a significant barrier to the early warning applications of e-nose for explosive or deadly gases.

This study developed a novel method for modulating and controlling temperature as a substitute for the traditional approach that relies on external heaters. Oblique angle deposition (OAD) was utilized to create a tungsten trioxide (WO3) nanorod film, which served as both a stable self-healing layer and a sensitive sensing layer. By self-heating temperature modulation, the OAD WO3 sensor can produce enough electrical response features because of its ultrafast (∼20 μs) thermal relaxation time.

With this progress, 12 gas molecules can be accurately discriminated in 0.5–1 seconds, an order of magnitude faster than state-of-the-art e-noses.

A wireless smart e-nose system was also created to accurately and quickly identify target gases in backgrounds of ambient air.

The team claims this advancement highlights the e-nose’s possible uses in public health and homeland security.

Journal Reference:

Li, M., et al. (2023) Prompt Electronic Discrimination of Gas Molecules by Self-Heating Temperature Modulation. American Chemical Society.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.