Carbon monoxide sensor based on perovskite Cs2PdBr6 nano hollow spheres as well as preparation method and application thereof
A carbon monoxide and cs2pdbr6 technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of high detection limit, complicated preparation process, poor response, etc., and achieve the effect of simple operation, stable device performance, and convenient device preparation
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Embodiment 1
[0031] Example 1: Perovskite Cs 2 PdBr 6 Synthesis and preparation of sensors
[0032] (1) Perovskite Cs 2 PdBr 6 Synthesis:
[0033] Weigh cesium bromide (4.2562 g, 20 mmol) and palladium bromide (2.6623 g, 10 mmol), and place in hydrogen bromide solution (10 mL), heat and stir at 85 °C for 10 min; then at 120 °C , add 1mL of dimethyl sulfoxide, stir for 10min; turn off the heating stage, cool to room temperature, filter the product with suction, wash with water and toluene, and dry in a vacuum oven at 100°C for 10h to obtain the product perovskite Cs 2 PdBr 6 , non-hollow structure, its SEM microstructure is as figure 1 As shown, its X-ray diffraction pattern is shown as figure 2 shown. Depend on figure 1 It can be seen that Cs 2 PdBr 6 It is a relatively uniform small octahedral particle; the schematic diagram of the structure is shown in Figure 8 .
[0034] Depend on figure 2 It can be seen that the above synthesized Cs 2 PdBr 6 with standard Cs 2 PdBr ...
Embodiment 2
[0044] Example 2: Response measurement experiments of carbon monoxide sensors in environments with different carbon monoxide concentrations
[0045] Based on perovskite Cs prepared in embodiment 1 2 PdBr 6 The carbon monoxide sensor of the nano hollow sphere is placed in the test machine. Under the condition of applying a constant voltage of 1 V, the response change of the test device in the range of 50 ppb-50 ppm is tested. The results are as follows: Figure 7 shown.
[0046] From Figure 7 It can be seen that for different concentrations of carbon monoxide atmosphere (diluted with nitrogen), based on Cs 2 PdBr 6 The sensor response of nano hollow spheres is obvious; the lowest detection limit can reach 50 ppb, which can be used for carbon monoxide gas detection.
[0047] Taking "CN2019111446042" Example 1 based on perovskite Cs 2 PdBr 6 The sensor (0.2% oleic acid) for the same carbon monoxide test above, starting from 50 ppb, until 5ppm, the response is poor, can no...
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