Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 283, Issue -, Pages 107-115Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.12.001
Keywords
Al-doped ZnO; Nanoparticles; Acetone; Gas sensors; Flame spray pyrolysis; Hydrothermal method
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NFR-2017M3A9F1052297]
- Swiss National Science Foundation [200021_159763/1]
- Swiss National Science Foundation (SNF) [200021_159763] Funding Source: Swiss National Science Foundation (SNF)
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The development of chemoresistive gas sensors for environmental and industrial air monitoring as well as medical breath analysis is investigated. Flame-made ZnO nanoparticles (NPs) doped with 1 at% Aluminum exhibited higher sensing performance (response 245, response time similar to 3 s, and sensitivity 23 ppm(-1)) than pure ZnO and those made by a hydrothermal method (HT) (56, similar to 12 s, and 4 ppm(-1)) for detection of 10 ppm acetone. Furthermore, their sensing response of similar to 10 to 0.1 ppm of acetone at 90% RH is superior to other metal oxide sensors and they feature good acetone selectivity to other compounds (including NH3, isoprene and CO). Characterization by N-2 adsorption, X-ray photoelectron and UV-vis spectroscopies reveals that the improved sensing performance of flame-made Al-doped ZnO NPs is associated primarily to a higher density of oxygen vacancies than pure ZnO and all HT-made NPs. This leads to a greater number of adsorbed oxygen ions on the surfaces of Al-doped ZnO NPs, which can react with acetone molecules.
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