Rare earth modified zinc oxide gas sensor and preparation method thereof
A gas sensor and rare earth modification technology, which is applied in the field of rare earth modified zinc oxide gas sensor and its preparation, can solve the problems of poor selectivity, long response recovery time, low sensitivity and the like, and achieves low production cost and high sensitivity , the effect of simple production process
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Embodiment 1
[0019] 0.25mol / LZn(NO 3 ) 2 ·6H 2 O was dissolved in 40 mL of deionized water to make zinc solution, stirred for 10 min, 40 mL of 2mol / L NaOH solution was added dropwise to the above solution, stirred for 30 min, transferred to a 100 mL autoclave, and reacted at 180 °C for 10 h. The obtained precipitate was washed with distilled water and absolute ethanol several times in sequence, and then dried at 80° C. to form zinc oxide powder for later use.
[0020] Under the above experimental conditions, in-situ doping of 7at% Sm(NO 3 ) 3 ·6H 2 O, stirred for 10 min, added dropwise 40 ml of NaOH solution with a molar concentration of 2 mol / L to the above solution, stirred for 30 min, transferred to a 100 mL autoclave, and reacted at 180 ° C for 10 h. The obtained precipitate is washed with distilled water and absolute ethanol several times in sequence, and then dried at 80° C. to obtain zinc oxide compounded with samarium.
[0021] Take 10mg of zinc oxide or zinc oxide powder of ...
Embodiment 2
[0024] 0.17mol / LZn(NO 3 ) 2 ·6H 2 O was dissolved in 40mL of deionized water to make a zinc solution, stirred for 10min, added dropwise to 30mL of NaOH solution with a molar concentration of 1.2mol / L, and 0.0019mol / L of ethylenediamine was added, ultrasonicated for 30min, and transferred to a 100mL high-pressure In the reaction kettle, react at 180°C for 20h. The obtained precipitate was washed several times with distilled water and absolute ethanol successively, and then dried at 80° C. into white zinc oxide powder for future use.
[0025] Under the above experimental conditions, in-situ doping of 5at% Er(NO 3 ) 3 ·6H 2 O, stirred for 10 min, added dropwise to 30 mL of NaOH solution with a molar concentration of 1.2 mol / L, and added 0.0019 mol / L ethylenediamine, ultrasonicated for 30 min, transferred to a 100 mL autoclave, and reacted at 180 °C for 20 h. The obtained precipitate was washed several times with distilled water and absolute ethanol successively, and then dr...
Embodiment 3
[0029] 0.15mol / LZn(CH 3 COO) 2 ·6H 2O was dissolved in 40 mL of deionized water to make a zinc solution, stirred for 10 min, added dropwise to 40 mL of NaOH solution with a molar concentration of 3 mol / L, ultrasonicated for 30 min, transferred to a 100 mL autoclave, and reacted at 100 °C for 15 h. The obtained precipitate was washed with distilled water and absolute ethanol several times in sequence, and then dried at 80° C. to make zinc oxide powder for later use.
[0030] Under the above experimental conditions, 4at% Y(NO 3 ) 3 ·6H 2 O, stirred for 10 min, added dropwise to 40 mL of NaOH solution with a molar concentration of 3 mol / L, ultrasonicated for 30 min, transferred to a 100 mL autoclave, and reacted at 100 °C for 15 h. The obtained precipitate was washed several times with distilled water and absolute ethanol successively, and then dried at 80°C to prepare yttrium-doped zinc oxide powder for future use. .
[0031] Take 8 mg of yttrium-doped zinc oxide or zinc ...
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