Bi2S3-based ammonia gas sensor and preparation method thereof
An ammonia sensor and substrate technology, applied in the field of sensors, can solve the problems of lack of ammonia sensors and achieve the effects of low cost, high responsiveness, and low energy consumption
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Embodiment 1
[0021] 1) Weigh 9.7 grams (0.02 moles) of Bi(NO 3 ) 3 ·5H 2 O, put it in a 300mL beaker, add 20ml of dilute nitric acid to dissolve, and then dilute to 100ml. The dissolved Bi(NO 3 ) 3 The solution was heated to 50°C in an ultrasonic constant temperature water bath, the ultrasonic frequency was adjusted to 40kHz, and the concentration of 0.3 mol / L Na 2 100 ml of S solution was added dropwise to Bi(NO 3 ) 3 In solution, Bi(NO 3 ) 3 with Na 2 The molar ratio of S is 2:3. At this time, there are a large number of brown and black Bi 2 S 3 Precipitation is formed, and after the reaction is completed, cool to room temperature, filter with suction, and wash three times with distilled water, and the obtained Bi 2 S 3 The solid was placed in an oven and dried at 150°C for four hours.
[0022] 2) The Bi prepared in step 1) 2 S 3 The nanoparticles were mixed with 0.1% polyvinyl alcohol, ground for 2 hours, and diluted to make a slurry.
[0023] 3) Take the aluminum oxide...
Embodiment 2
[0026] 1) Weigh 9.7 grams (0.02 moles) of Bi(NO 3 ) 3 ·5H 2 O, put it in a 300mL beaker, add 20ml of dilute nitric acid to dissolve, and then dilute to 100ml. The dissolved Bi(NO 3 ) 3 The solution is placed in an ultrasonic constant temperature water bath, the ultrasonic frequency is adjusted to 40kHz, and the concentration of 0.3 mol / L Na 2 100 ml of S solution was added dropwise to Bi(NO 3 ) 3 In solution, Bi(NO 3 ) 3 with Na 2 The molar ratio of S is 2:3. At this time, there are a large number of brown and black Bi 2 S 3 Precipitation is formed, and after the reaction is completed, cool to room temperature, filter with suction, and wash three times with distilled water, and the obtained Bi 2 S 3 The solid was placed in an oven and dried at 150°C for four hours.
[0027] 2) The Bi prepared in step 1) 2 S 3 The nanoparticles were mixed with 0.1% polyvinyl alcohol, ground for 2 hours, and diluted to make a slurry.
[0028] 3) Take the glass substrate, put it ...
Embodiment 3
[0031] 1) Weigh 9.7 grams (0.02 moles) of Bi(NO 3 ) 3 ·5H 2 O, put it into a 300mL ground-necked flask, add 20ml of dilute nitric acid to dissolve, and then dilute to 100ml. After capping with a ground glass stopper with dual conduits, the Bi(NO 3 ) 3 The flask of the solution was moved into an ultrasonic constant temperature water bath and heated to 50°C, and the ultrasonic frequency was adjusted to 40kHz. Connect the flask tube with the H 2 The steel cylinder of S gas is connected, and 0.03 moles of H 2 S gas is slowly introduced into the Bi(NO 3 ) 3In solution, Bi(NO 3 ) 3 with H 2 The molar ratio of S is 2:3, and the tail gas is introduced into the sodium hydroxide solution (concentration of 6 mol / liter) in another container to be absorbed. During the reaction, a large amount of brown-black Bi 2 S 3 Precipitation is formed, and after the reaction is completed, cool to room temperature, filter with suction, and wash three times with distilled water, and the obt...
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