纳米复合材料
材料科学
丙酮
碳纳米管
异质结
量子点
吸附
纳米技术
化学工程
介孔材料
纳米颗粒
催化作用
化学
光电子学
物理化学
有机化学
工程类
作者
Rinku Paul,Ranajit Ghosh
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-06-09
卷期号:6 (12): 10223-10235
被引量:8
标识
DOI:10.1021/acsanm.3c01029
摘要
Recently, low-dimensional semiconducting metal oxide (SMO) nanostructures have revolutionized the concept of conventional SMO-based chemiresistive gas sensors owing to their unique catalytic, electrical, and optical properties. The elevated working temperature of SMO-based sensors can be lowered by incorporating carbonaceous materials. Herein, we report for the first time, the superior acetone sensing performance at room temperature (RT, 27 °C) using ceria (CeO2) quantum dots (QDs) (7 ± 1 nm)-decorated carbon nanotube (CNT)-based nanocomposites. A hydrothermally prepared CeO2 QDs/CNT mesoporous heterostructure with a high surface area (152 m2 g–1) exhibits an excellent response (Ga/Gg) of 10,890 at RT with an ultrafast response/recovery time (56 ms/22 ms) and high selectivity toward acetone. The study unveils that the nanocomposite possesses simultaneous full and partial recovery response transients which is modeled using a heterogeneous adsorption site-based Langmuir–Hinshelwood mechanism. Besides, the mesoporosity of the nanocomposite results in fast diffusion of acetone molecules which reduces the detection time and incorporation of highly conductive CNTs lowers the operating temperature. The presence of Ce3+ states confirms the existence of high oxygen vacancies in CeO2 QDs resulting in enhanced adsorption capabilities of the nanocomposite. Moreover, the multi nanojunctions between CeO2 QDs and CNTs have a strong influence on the enhanced RT acetone response value.
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