Based on perovskite cs 2 pdbr 6 Carbon monoxide sensor based on nano hollow sphere and its preparation method and use
A technology of carbon monoxide and cs2pdbr6, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of inapplicability to large-scale application, complex preparation process, high detection limit, etc., and achieve the effect of low detection limit, convenient device preparation and simple operation
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Embodiment 1
[0031] Example 1: Perovskite Cs 2 PdBr 6 Synthesis and fabrication 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), place them in hydrogen bromide solution (10 mL), heat at 85 °C and stir for 10 min; then at 120 °C , add 1 mL of dimethyl sulfoxide, and stir for 10 min; turn off the heating table, cool to room temperature, filter the product, wash with water and toluene, and dry it in a vacuum oven at 100 °C for 10 h 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 as follows figure 2 shown. Depend on figure 1 It can be seen that Cs 2 PdBr 6 is a relatively uniform octahedral small particle; the schematic diagram is as follows Figure 8 .
[0034] Depend on figure 2 It can be seen that the above synthesized Cs 2 PdBr 6 with standard Cs 2 PdBr 6 The PDF cards ...
Embodiment 2
[0044] Example 2: Response measurement experiment of carbon monoxide sensor in different carbon monoxide concentration environments
[0045] The perovskite-based Cs prepared in Example 1 2 PdBr 6 The carbon monoxide sensor of hollow nanospheres is placed in the test machine, and the response of the test device is changed in the range of 50 ppb-50 ppm under the condition of applying a constant voltage of 1 V. 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 the hollow nanospheres 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) was subjected to the same carbon monoxide test above, starting at 50 ppb and ending at 5 ppm, with poor response and u...
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