The smart e-nose powered by self-heating temperature modulation enables rapid differentiation of gas molecules.

Self-Heating Smart E-Nose System Based on Temperature Modulation. Credit: Li Meng

A recent study published I ACS sensor The development of a smart electronic nose (e-nose) by a research team led by Professor Meng Geng of the Hefei Institute of Physical Science of the Chinese Academy of Sciences was highlighted.

The novel e-nose uses a self-heating modulation strategy to accurately separate a variety of target gas molecules within just one second.

Significant progress has been made in the detection of gas molecules using non-selective e-noses. Gas sensor. However, extracting adequate molecular features in a short time (<1 second) remains a major obstacle, hindering early warning applications of e-nose for lethal or explosive gases.

In this study, an innovative method for temperature control and modulation was developed as an alternative to the conventional method using an external heater. Tungsten trioxide (WO3) nanorod film prepared by oblique angle deposition (OAD) was used as both a sensitive sensing layer and a stable self-heating layer. Owing to the ultrafast (20 μs) thermal relaxation time, OAD WO3 The sensor can produce sufficient electrical response characteristics by self-heating temperature modulation.

This development has accurately distinguished 12 gas molecules within 0.5-1 second, an order of magnitude faster than state-of-the-art e-noses.

In addition, a smart wireless e-nose system was developed to enable accurate and rapid detection of target gases against ambient air background.

According to the team, this development demonstrates the potential use of e-noses in homeland security and public health.

More information:
Meng Li et al., Instant electronic separation of gas molecules by self-heating temperature modulation, ACS sensor (2023). DOI: 10.1021/acssensors.3c01839

Reference: Smart E-Nose Uses Self-Heating Temperature Modulation to Enable Rapid Identification of Gas Molecules (2024, February 19) https://phys.org/news/2024-02-19-February-19. Retrieved from smart-nose-temperature-modulation -enable.html

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