Selective Ammonia Detection by Field Effect Gas Sensor as an Instrumentation Basis for HP-Infection Primary Diagnosis

Samotaev, Nikolay; Etrekova, Maya; Литвинов, А. В.; Mikhailov, A. A.

doi:10.1007/978-3-030-92328-0_24

Cited by 1 publication

(2 citation statements)

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“…The response and recovery times are τ r ≈ 3 s and τ d ≈ 44 s, respectively. The transport of the respective gas molecules to the sensor surface can occur via the free volume and the cyclotetrasiloxane rings in PV4D4, as already suggested in our previous study [4]. Larger molecules such as organic solvents seem not to pass the cyclotetrasiloxane rings because they are simply too large.…”

Section: Gas-sensing Measurements and Evaluationsupporting

confidence: 61%

“…The introduction of novel gas detectors with rapid and efficient gas concentration detection capabilities has been a major focus for different application fields [3]. One of the current techniques that is being intensively developed is the breath test [4], which uses different methods, technologies, and analytical systems. These include different sampling injections methods and devices such as gas chromatographs (GC) but also sensorbased devices.…”

Section: Introductionmentioning

confidence: 99%

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Two-in-One Sensor Based on PV4D4-Coated TiO2 Films for Food Spoilage Detection and as a Breath Marker for Several Diseases

Brinza,

Schröder,

Ababii

et al. 2023

Biosensors

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Certain molecules act as biomarkers in exhaled breath or outgassing vapors of biological systems. Specifically, ammonia (NH3) can serve as a tracer for food spoilage as well as a breath marker for several diseases. H2 gas in the exhaled breath can be associated with gastric disorders. This initiates an increasing demand for small and reliable devices with high sensitivity capable of detecting such molecules. Metal-oxide gas sensors present an excellent tradeoff, e.g., compared to expensive and large gas chromatographs for this purpose. However, selective identification of NH3 at the parts-per-million (ppm) level as well as detection of multiple gases in gas mixtures with one sensor remain a challenge. In this work, a new two-in-one sensor for NH3 and H2 detection is presented, which provides stable, precise, and very selective properties for the tracking of these vapors at low concentrations. The fabricated 15 nm TiO2 gas sensors, which were annealed at 610 °C, formed two crystal phases, namely anatase and rutile, and afterwards were covered with a thin 25 nm PV4D4 polymer nanolayer via initiated chemical vapor deposition (iCVD) and showed precise NH3 response at room temperature and exclusive H2 detection at elevated operating temperatures. This enables new possibilities in application fields such as biomedical diagnosis, biosensors, and the development of non-invasive technology.

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Section: Gas-sensing Measurements and Evaluationsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%