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Influence of Silsesquioxane-Containing Ultra-Thin Polymer Films on Metal Oxide Gas Sensor Performance for the Tunable Detection of Biomarkers

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dc.contributor.author LUPAN, Oleg
dc.contributor.author BRINZA, Mihai
dc.contributor.author PIEHL, Julia
dc.contributor.author ABABII, Nicolai
dc.contributor.author MAGARIU, Nicolae
dc.contributor.author ZIMOCH, Lukas
dc.contributor.author STRUNSKUS, Thomas
dc.contributor.author PAUPORTE, Thierry
dc.contributor.author ADELUNG, Rainer
dc.contributor.author FAUPEL, Franz
dc.contributor.author SCHRÖDER, Stefan
dc.date.accessioned 2024-06-13T08:36:08Z
dc.date.available 2024-06-13T08:36:08Z
dc.date.issued 2024
dc.identifier.citation LUPAN, Oleg et al. Influence of Silsesquioxane-Containing Ultra-Thin Polymer Films on Metal Oxide Gas Sensor Performance for the Tunable Detection of Biomarkers. In: Chemosensors, 2024, nr. 12, art. nr. 76. ISSN 2227-9040. en_US
dc.identifier.issn 2227-9040
dc.identifier.uri https://doi.org/10.3390/chemosensors12050076
dc.identifier.uri http://repository.utm.md/handle/5014/27385
dc.description Acces full text - https://doi.org/10.3390/chemosensors12050076 en_US
dc.description.abstract Certain biomarkers in exhaled breath are indicators of diseases in the human body. The non-invasive detection of such biomarkers in human breath increases the demand for simple and cost-effective gas sensors to replace state-of-the-art gas chromatography (GC) machines. The use of metal oxide (MOX) gas sensors based on thin-film structures solves the current limitations of breath detectors. However, the response at high humidity levels, i.e., in the case of exhaled human breath, significantly decreases the sensitivity of MOX sensors, making it difficult to detect small traces of biomarkers. We have introduced, in previous work, the concept of a hybrid gas sensor, in which thin-film-based MOX gas sensors are combined with an ultra-thin (20–30 nm) polymer top layer deposited by solvent-free initiated chemical vapor deposition (iCVD). The hydrophobic top layer enables sensor measurement in high-humidity conditions as well as the precise tuning of selectivity and sensitivity. In this paper, we present a way to increase the hydrogen (H2) sensitivity of hybrid sensors through chemical modification of the polymer top layer. A poly(1,3,5,7-tetramethyltetravinylcyclotetrasiloxane) (PV4D4) thin film, already applied in one of our previous studies, is transformed into a silsesquioxane-containing top layer by a simple heating step. The transformation results in a significant increase in the gas response for H2 ~709% at an operating temperature of 350 ◦C, which we investigate based on the underlying sensing mechanism. These results reveal new pathways in the biomedical application field for the analysis of exhaled breath, where H2 indicates gastrointestinal diseases. en_US
dc.language.iso en en_US
dc.publisher MDPI (Basel, Switzerland) en_US
dc.relation.ispartofseries Chemosensors;2024, nr. 1-2(143-144)
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject biomarkers en_US
dc.subject hybrid gas sensors en_US
dc.subject hydrogen en_US
dc.subject breath en_US
dc.title Influence of Silsesquioxane-Containing Ultra-Thin Polymer Films on Metal Oxide Gas Sensor Performance for the Tunable Detection of Biomarkers en_US
dc.type Article en_US


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