异质结
丙酮
纳米颗粒
材料科学
微观结构
纳米复合材料
半导体
选择性
化学工程
光电子学
纳米技术
化学
复合材料
有机化学
催化作用
工程类
作者
Yuanyuan Song,Fubo Gu,Zhihua Wang,Dongmei Han
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-10-18
卷期号:5 (10): 15298-15309
被引量:9
标识
DOI:10.1021/acsanm.2c03383
摘要
The development of uniform heterostructures for gas-sensing materials is promising to achieve both a fast response and recovery time at low gas levels and good selectivity at significantly high interference gas levels. Here we report the preparation of a ZIF-8-derived metal oxide semiconductor nanocomposite with a heterojunction structure and its application as acetone gas sensor. This heterojunction composite was fabricated through in situ growth of ZnFe2O4 nanoparticles (10–20 nm) on the outer surface of rhombic dodecahedral-shaped ZnO. Through the derivative strategy, the ZnFe2O4/ZnO heterojunction sensor had a high response value of 225 ± 15 and a fast response time of 6 s to 100 ppm of acetone at the optimum working temperature of 260 °C. Furthermore, the response value reached 5.1 for only 1.8 ppm of acetone even under extremely high humidity (85%). To obtain a demonstration of the concept, an in-depth investigation of the sensing performances and the microstructure and surface state of ZnO and ZnFe2O4/ZnO heterojunction materials was carried out. We found that the excellent acetone sensitivity enhancement could largely be attributed to the ultrahigh number of free electrons and the abundant active sites generated by the tightly bound n–n heterojunction structure of ZnFe2O4/ZnO and the morphological characteristics. The large specific surface area of every sensing domain was the secondary factor in enhancing the gas-sensing properties. It suggests that this design for fabricating uniform and sensitive gas sensors may facilitate potential applications in detecting acetone gas.
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