{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T03:46:47Z","timestamp":1788407207919,"version":"build-2803163510"},"reference-count":75,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2025,9,25]],"date-time":"2025-09-25T00:00:00Z","timestamp":1758758400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Guangdong Basic and Applied Basic Research Foundation","award":["2023A1515012286"],"award-info":[{"award-number":["2023A1515012286"]}]}],"content-domain":{"domain":["www.mdpi.com"],"crossmark-restriction":true},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Hierarchical NiO-SnO2 nanoflowers were prepared via a one-step hydrothermal method. The morphology, structure and components of the hierarchical NiO-SnO2 nanoflowers were examined via scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The ethanol gas-sensing performance was systematically analyzed between pure hierarchical SnO2 nanoflowers and the hierarchical NiO-SnO2 nanoflowers. The results indicated that the hierarchical NiO-SnO2 nanoflowers showed better gas-sensing properties than the pure hierarchical SnO2 nanoflowers at 164 \u00b0C. The enhanced gas-sensing performance was ascribed to the formation of p-n heterojunctions between p-type NiO and n-type SnO2. Additionally, NiO has a catalytic role. Therefore, hierarchical NiO-SnO2 nanoflowers could be a potential gas-sensing material for the fabrication of high-quality ethanol gas sensors.<\/jats:p>","DOI":"10.3390\/nano15191471","type":"journal-article","created":{"date-parts":[[2025,9,26]],"date-time":"2025-09-26T06:02:52Z","timestamp":1758866572000},"page":"1471","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Fabrication of Low-Temperature ppb-Level Ethanol Gas Sensor Based on Hierarchical NiO-SnO2 Nanoflowers Under Hydrothermal Conditions"],"prefix":"10.3390","volume":"15","author":[{"given":"Liming","family":"Song","sequence":"first","affiliation":[{"name":"School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-3689-7275","authenticated-orcid":false,"given":"Xiaoxin","family":"Dou","sequence":"additional","affiliation":[{"name":"School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1152-1787","authenticated-orcid":false,"given":"Jianmei","family":"Shao","sequence":"additional","affiliation":[{"name":"School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanzheng","family":"Luo","sequence":"additional","affiliation":[{"name":"School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, 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