{"title":"Porous nanosheets-assembled NiMoO4–NiO microflowers for high-selectivity to NO2","authors":"Haibo Ren , Hui Pan , Gaoju Zhang , Jiarui Huang","doi":"10.1016/j.micrna.2025.208079","DOIUrl":null,"url":null,"abstract":"<div><div>This study synthesized a porous structure of NiMoO<sub>4</sub>–NiO microflowers assembled with uniform nanosheets using a facile hydrothermal technique and calcination method. The unique porous microflower, consisting of the nanosheets assembled together, provides abundant space for gas diffusion and channels for electron transport. The gas sensor, fabricated using the NiMoO<sub>4</sub>–NiO microflowers, exhibited outstanding sensing behaviors towards NO<sub>2</sub> gas. It showed a higher response value of 36.9 at 210 °C, with short response/recovery times of 30 s/16 s for 100 ppm NO<sub>2</sub> gas. The detection limit for NO<sub>2</sub> gas was 207 ppb. Additionally, it demonstrated high selectivity to NO<sub>2</sub> gas and excellent long-term stability. Furthermore, the sensor was tested under different relative humidity conditions. The superior NO<sub>2</sub> sensing properties are attributed to the abundant p-p heterojunctions, synergistic catalytic effect between the NiMoO<sub>4</sub> and the NiO, and the porous microflowers. The NiMoO<sub>4</sub>–NiO microflowers sensor shows great promise for detecting NO<sub>2</sub> gas in practical applications.</div></div>","PeriodicalId":100923,"journal":{"name":"Micro and Nanostructures","volume":"199 ","pages":"Article 208079"},"PeriodicalIF":2.7000,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Micro and Nanostructures","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2773012325000081","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
This study synthesized a porous structure of NiMoO4–NiO microflowers assembled with uniform nanosheets using a facile hydrothermal technique and calcination method. The unique porous microflower, consisting of the nanosheets assembled together, provides abundant space for gas diffusion and channels for electron transport. The gas sensor, fabricated using the NiMoO4–NiO microflowers, exhibited outstanding sensing behaviors towards NO2 gas. It showed a higher response value of 36.9 at 210 °C, with short response/recovery times of 30 s/16 s for 100 ppm NO2 gas. The detection limit for NO2 gas was 207 ppb. Additionally, it demonstrated high selectivity to NO2 gas and excellent long-term stability. Furthermore, the sensor was tested under different relative humidity conditions. The superior NO2 sensing properties are attributed to the abundant p-p heterojunctions, synergistic catalytic effect between the NiMoO4 and the NiO, and the porous microflowers. The NiMoO4–NiO microflowers sensor shows great promise for detecting NO2 gas in practical applications.