posted on 2023-12-08, 05:04authored byChanghong Zhou, Haiming Zhang, Sinan Liu, Huanhuan Cao, Xiaomin Jia, Jianing Jia, Kefan Ma
High operating temperatures have
been one of the most serious problems
restricting the development of metal oxide gas sensors. The development
of room temperature (RT) sensing is significant in practical applications.
Herein, for the first time, we combined environmentally friendly lead-free
double perovskite photovoltaic material Cs2AgBiBr6 quantum dots (CABB QDs) (9–13 nm) with MOF-derived Co3O4, and mesoporous heterogeneous composite materials
(average pore diameter about 17.58 nm) with a series of weight percentage
(wt %) CABB QDs supported on Co3O4 nanocages
were prepared by the template and heat treatment method. The gas sensing
test results indicate that adding photovoltaic material CABB QDs can
achieve high-performance acetone sensing at RT (25 °C). Especially,
the sensor based on 2.0 wt % QDs-Co3O4 exhibited
the highest gas-sensitive response to acetone, with a response value
of 13 at 60 ppm and a fast response and recovery time of 7 and 27
s, respectively. Meanwhile, the 2.0 wt % QDs-Co3O4 sensor showed good selectivity, repeatability, and long-term stability.
In addition, we delved into the sensing mechanism of acetone’s
high response and selectivity at RT. This work provides a constructive
idea for the detection of acetone at RT and has significant implications
for accelerating the practical application of MOS-based gas sensors.