Preparation method of discontinuous double-sided heterojunction sandwich structure tin dioxide-nickel oxide-tin dioxide, product of preparation method, and application of discontinuous double-sided heterojunction sandwich structure
A tin dioxide, sandwich structure technology, applied in nickel oxide/nickel hydroxide, tin oxide, instruments, etc., can solve the problems of poor selectivity, low sensitivity, slow response and recovery, etc.
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Embodiment 1
[0020] (1) Dissolve 0.5 mol / l nickel chloride in 50 ml deionized water to form Ni 2+ Solution, after stirring at 200 rpm for 30 min, hexamethyltetramine was added at room temperature and continued to stir for 1 h at the same stirring speed, and the flow rate of nitrogen was 5 ml / min, and then the temperature was raised to 90 o C is reacted for 1h, and the Ni(OH) produced 2 The precipitate was centrifuged and washed 3 times with deionized water, dried in an oven for 24 h, and immersed in 0.5 mol / l SnCl 4 After being placed in the solution for 24 hours, it was dried in a muffle furnace at 500 o C sintered for 3 h to obtain SnO with discontinuous double-sided heterojunction sandwich structure 2 -NiO-SnO 2 , see figure 1 This example synthesizes SnO with a discontinuous double-sided heterojunction sandwich structure 2 -NiO-SnO 2 The scanning electron microscope photo, the response to formaldehyde gas see figure 2 Example 1 Synthesis of SnO with discontinuous double-sided h...
Embodiment 2
[0022] (1) Dissolve 1.2 mol / l nickel chloride in 50 ml deionized water to form Ni 2+ Solution, after stirring at 300 rpm for 30 min, add hexamethyltetramine at room temperature and continue stirring at the same stirring speed for 1 h, feed nitrogen flow rate at 15 ml / min, then heat up to 90 o C is reacted for 1h, and the Ni(OH) produced 2 The precipitate was centrifuged and washed 3 times with deionized water, dried in an oven for 24 h, and immersed in 2 mol / l SnCl 4 After being placed in the solution for 24 hours, it was dried in a muffle furnace at 800 o C sintered for 3 h to obtain SnO with discontinuous double-sided heterojunction sandwich structure 2 -NiO-SnO 2 .
Embodiment 3
[0024] (1) Dissolve 0.9 mol / l nickel chloride in 50 ml deionized water to form Ni 2+ Solution, after stirring at 250 rpm for 30 min, add hexamethyltetramine at room temperature and continue stirring at the same stirring speed for 1 h, feed nitrogen flow rate at 10 ml / min, then heat up to 90 o C is reacted for 1h, and the Ni(OH) produced 2 The precipitate was centrifuged and washed 3 times with deionized water, dried in an oven for 24 h, and immersed in 1.2 mol / l SnCl 4 After being placed in the solution for 24 hours, it was dried in a muffle furnace at 750 o C sintered for 3 h to obtain SnO with discontinuous double-sided heterojunction sandwich structure 2 -NiO-SnO 2 .
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