期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 351, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130863
关键词
Acetone gas sensor; Rh(2)O3; Porous ZnO; First-principles analysis; P-n heterostructure
资金
- National Natural Science Foundation of China [11804194]
- University Natural Science Research Project of Anhui Province [KJ2020A0480]
An ultrasensitive acetone gas sensor based on p-Rh2O3-n-ZnO porous heterostructure has been fabricated with a detection limit of 50 ppb. The sensor exhibits good repeatability, selectivity, and linear response, and can distinguish between the acetone concentrations of diabetic patients and healthy individuals. Theoretical models based on first-principles calculations have been used to explain the ultrasensitivity of the sensor.
Detecting the acetone in human exhaled breath sensitively and selectively plays an important role in the noninvasive diagnosis of diabetes. However, obtaining a reliable response to ppb level acetone in exhaled breath directly is still a big challenge. Here, an ultrasensitive acetone gas sensor based on p-Rh2O3-n-ZnO porous heterostructure has been fabricated. The detection limit of the sensor reaches to 50 ppb. The sensor exhibits well repeatability, selectivity and linear response. A good linear relationship between the response and ambient relative humidity is observed. Without removing the water vapor of the exhaled gas, it can distinguish the acetone concentration of the diabetic patients from that of healthy people, implying that the sensor could be used in the diagnosis of diabetes. The synergistic effect of p-Rh2O3-n-ZnO porous heterostructure makes the sensor own ultrasensitive detecting ability towards acetone. Theoretical models have been built by first-principles calculation to reveal the possible reasons for its ultrasensitivity. It should be pointed out that the much lower adsorption energy (- 1.03 eV) of the acetone molecule on Rh2O3 may be the chief cause of the lower detection limit of the sensor.
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