Room temperature formaldehyde sensor based on WS2/CuS and preparation method thereof
A formaldehyde sensor, room temperature technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of low sensitivity, poor selectivity, poor stability, etc.
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Embodiment 1
[0047] (1) Preparation of WS 2 ultrathin nanosheets
[0048] (1.1) First, dissolve 2 mmol of tungsten chloride in 30 mL of deionized water, ultrasonicate for 3 minutes, and then magnetically stir for 10 minutes to obtain a uniform solution, then add 10 mmol of L-cysteine, and continue magnetically stirring for 30 minutes.
[0049] (1.2) The above solution was transferred to a 50 mL hydrothermal reaction kettle, and then put into an oven with a heating temperature of 220° C. and a heating time of 18 hours.
[0050] (1.3) After the reaction, the reaction product was washed several times with deionized water, frozen at -90°C for 8 hours in a freeze dryer, and then vacuum-dried for 36 hours to obtain WS 2 ultrathin nanosheets. The prepared WS 2 SEM images of ultrathin nanosheets figure 1 shown.
[0051] (2) Preparation of CuS nanocubes
[0052] (2.1) Dissolve 2 mmol of copper nitrate in 100 mL of deionized water, stir magnetically for 5 min to obtain a clear blue solution. ...
Embodiment 2
[0064] (1) Preparation of WS 2 ultrathin nanosheets
[0065] (1.1) First, dissolve 2 mmol of tungsten chloride in 30 mL of deionized water, ultrasonicate for 2 min, and then magnetically stir for 10 min to obtain a uniform solution, then add 20 mmol of L-cysteine, and continue magnetically stirring for 30 min.
[0066] (1.2) The above solution was transferred to a 50mL hydrothermal reaction kettle, and then put into an oven with a heating temperature of 240°C and a heating time of 24h.
[0067] (1.3) After the reaction, the reaction product was washed several times with deionized water, frozen at -90°C for 8 hours in a freeze dryer, and then vacuum-dried for 36 hours to obtain WS 2 ultrathin nanosheets.
[0068] (2) Preparation of CuS nanocubes
[0069] (2.1) Dissolve 2 mmol of copper nitrate in 100 mL of deionized water, stir magnetically for 5 min to obtain a clear blue solution.
[0070] (2.2) Transfer the obtained blue solution to a three-necked flask, and heat it to 7...
Embodiment 3
[0078] (1) Preparation of WS 2 ultrathin nanosheets
[0079] (1.1) Firstly, dissolve 2 mmol of tungsten chloride in 30 mL of deionized water, ultrasonicate for 2 minutes, and magnetically stir for 10 minutes to obtain a uniform solution, then add 30 mmol of L-cysteine, and continue magnetically stirring for 30 minutes.
[0080] (1.2) The above solution was transferred to a 50 mL hydrothermal reaction kettle, and then put into an oven with a heating temperature of 255° C. and a heating time of 30 h.
[0081] (1.3) After the reaction, the reaction product was washed several times with deionized water, frozen at -90°C for 8 hours in a freeze dryer, and then vacuum-dried for 36 hours to obtain WS 2 ultrathin nanosheets.
[0082] (2) Preparation of CuS nanocubes
[0083] (2.1) Dissolve 2 mmol of copper nitrate in 100 mL of deionized water, stir magnetically for 5 min to obtain a clear blue solution.
[0084] (2.2) Transfer the obtained blue solution to a three-necked flask, and...
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