| Title: | Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature |
| Author(s): | Vigna L; Nigro A; Verna A; Ferrari IV; Marasso SL; Bocchini S; Fontana M; Chiodoni A; Pirri CF; Cocuzza M; |
| Address: | "Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy. Center for Sustainable Future Technologies, Istituto Italiano di Tecnologia, Via Livorno 60, 10144 Torino, Italy. CNR-IMEM, Parco Area delle Scienze 37a, 43124 Parma, Italy" |
| ISSN/ISBN: | 2470-1343 (Electronic) 2470-1343 (Linking) |
| Abstract: | "Miniaturized low-cost sensors for volatile organic compounds (VOCs) have the potentiality to become a fundamental tool for indoor and outdoor air quality monitoring, to significantly improve everyday life. Layered double hydroxides (LDHs) belong to the class of anionic clays and are largely employed for NO (x) detection, while few results are reported on VOCs. In this work, a novel LDH coprecipitation method is proposed. For the first time, a study comparing four LDHs (ZnAl-Cl, ZnFe-Cl, ZnAl-NO(3), and MgAl-NO(3)) is carried out to investigate the sensing performances. As explored through several microscopy and spectroscopy analyses, LDHs show a morphology characterized by a large surface area and a three-dimensional hierarchical flowerlike architecture with micro- and nanopores that induce a fast diffusion and highly effective surface interaction of the target gases. The fabricated sensors, operating at room temperature, are able to reversibly and selectively detect acetone, ethanol, ammonia, and chlorine vapors, reaching significant sensing response values up to 6% at 21 degrees C. The results demonstrate that by changing the LDHs' composition, it is possible to modulate the sensitivity and selectivity of the sensor, helping the discrimination of different analytes, and the consequent integration on a sensor array paves the way for electronic nose development" |
| Notes: | "PubMed-not-MEDLINEVigna, Lorenzo Nigro, Arianna Verna, Alessio Ferrari, Ivan Vito Marasso, Simone Luigi Bocchini, Sergio Fontana, Marco Chiodoni, Angelica Pirri, Candido Fabrizio Cocuzza, Matteo eng 2021/08/17 ACS Omega. 2021 Jul 29; 6(31):20205-20217. doi: 10.1021/acsomega.1c02038. eCollection 2021 Aug 10" |
