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- Title
ZnO/NiO heterostructure-based microsensors used in formaldehyde detection at room temperature: Influence of the sensor operating voltage.
- Authors
Chelu, Mariana; Chesler, Paul; Anastasescu, Mihai; Hornoiu, Cristian; Mitrea, Daiana; Atkinson, Irina; Brasoveanu, Costin; Moldovan, Carmen; Craciun, Gabriel; Gheorghe, Marin; Gartner, Mariuca
- Abstract
Recently the emissions of volatile organic compounds (VOCs) in the atmosphere have increased dramatically with rapid development of urbanization and industry. This led to a large decline in air quality around the world, which resulted in a heavy impact on human health. Therefore, new/cheap detection devices for VOCs are of high interest. Formaldehyde (FA) is a very toxic VOC, which damages the respiratory system even in the smallest doses and short exposure time. Zinc oxide (ZnO)/nickel oxide (NiO) heterostructures were synthesized using an economical route: firstly, NiO was prepared by liquid exfoliation technique and deposited by dip-coating on alumina ceramic transducers with two interdigital gold (Au) electrodes, followed by low—temperature hydrothermal growth of ZnO. The as-prepared sensors were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM-EDAX), and X-Ray fluorescence (XRF). The response/recovery of ZnO/NiO heterostructure-based microsensors for formaldehyde was investigated at room temperature, in agreement with modern sensing requirements. The sensor operating voltage was varied between 1.5 and 5.0 V direct current (DC), to achieve the best sensor performance.
- Subjects
NICKEL oxides; TEMPERATURE sensors; FORMALDEHYDE; ZINC oxide; ATOMIC force microscopy; X-ray fluorescence
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 25, p19998
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08818-1