【作者】：Zhao, L.; Jin, R.; Wang, C; Wang, T.; Sun, Y.; Sun, P; Lu, G.
【题目】：Flower-like ZnO-Co3O4 heterojunction composites for enhanced acetone sensing
【关键词】：Acetone sensor; Heterostructure; ZnO-Co3O4; Low working temperature; Nanosheet hollow sphere
【版面信息】：Sensors and Actuators: B. Chemical 2023, 390, 133964.
摘要:
In this work, we successfully prepare the ZnO-Co3O4heterostructure on a nanosheet hollow sphere structure. Due to the high redox activity of Co3O4, the fabricated sensor using 3 at% ZnO-Co3O4hollow composite exhibits enhanced acetone sensing performance (S = 17.3-50 ppm) at a low operating temperature (150 degrees C), which is about 5.1 times higher than that of Co3O4-based sensor (S=3.4-50 ppm). Meanwhile, the ZnO-Co3O4based sensor shows ppb-level detection limit (S=1.3 at 100 ppb). The reason for the higher sensitivity and lower detection limit of the sensor is that the formation of n-p heterojunctions reduces both the degree of upward band -bending and the surface hole concentration, that allows the sensor to have a higher gas response under the same surface sensing-reactions (surface charge transfer).
原文链接：https://www.sciencedirect.com/science/article/pii/S0925400523006792
