Hairui Fang,Hong Chen,Rong Tan,Lei Ge,Tingting Zhao,Haochen Wang,Shenglin Yuan,Dong Wang
Sulfur dioxide (SO 2 ) is a toxic and harmful decomposition product generated during arc discharge or partial discharge in sulfur hexafluoride (SF 6 ) electrical equipment, which can corrode internal pipelines. Detecting SO 2 is crucial for assessing the insulation condition of equipment and preventing faults. To overcome the challenges faced by traditional SO 2 gas sensors, including high operating temperatures, slow response times, and poor moisture resistance, this paper proposes a novel SO 2 gas sensor based on CuO/MoO 3 . The morphology, composition, and chemical states of the materials were analyzed using different characterization techniques. At 90°C, the S2 sensor (CuO: MoO 3 =1: 1) exhibited a fast response time (10 s) to 10 ppm SO 2 and demonstrated good moisture resistance (a 1 % change in relative humidity (RH) has the same effect on the sensor as 25.9 ppb SO 2 ). The response of the S2 sensor to 100 ppm SO 2 was 26.5. Additionally, the voltage sensitivity of the S2 sensor at low (1–10 ppm) and high (10–100 ppm) concentrations are 658.74 mV/ppm and 33.43 mV/ppm, respectively. Therefore, the S2 sensor is more suitable for low concentration conditions. These good sensing characteristics of the S2 sensor are owing to the high content of oxygen vacancies (39.2 %) and the heterojunction effect in the composite material. Additionally, this sensor exhibits excellent anti-interference capabilities, including moisture resistance and high selectivity. Therefore, the CuO/MoO 3 -based SO 2 gas sensor can be effectively applied to detect the decomposition of SF 6 .
Recently emerging perovskite quantum dots (PQDs) with several excellent optical properties, such as quantum efficiency, narrow band emission, and tunable emission wavelength, have promising applications in solar cells and light emitting diodes. However, relatively rare applications of PQDs can be found in the field of sensing, mainly due to the very easy degradation of PQDs upon exposure to water or ambient humidity. In this work, for the first time CH3NH3PbBr3 PQDs were encapsulated into superhydrophobic silica aerogels (AGs) to protect PQDs from being degraded by water. The synthesized PQDs@AGs not only maintain the strong fluorescence emission activity of PQDs but also show excellent stability in the presence of water. Additionally, PQDs@AGs have abundant pores making them very suitable for gas sensing. For improving sensing performances, 3D-printing technology is introduced into gas cell design and fabrication for the first time. Finally, a novel, sensitive, selective, and reversible fluorescence sensor for SO2 gas based on the PQDs@AGs functional material and the 3D-printed gas cell has been developed.
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