Photoelectrochemistry type optical detector based on two-dimensional selenium nanosheet, and preparation method thereof
A photoelectrochemical and photodetector technology, used in photometry using electrical radiation detectors, nanotechnology for materials and surface science, nanotechnology, etc. Poor performance, short detection wavelength and other problems, to achieve the effect of simple and easy operation, good photoelectric detection performance, and long service life
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[0049] The second aspect of the present invention provides a method for preparing a photoelectrochemical photodetector based on two-dimensional selenium nanosheets, comprising the following steps:
[0050] S01, providing a selenium raw material, and stripping the selenium raw material by a liquid phase stripping method to obtain a two-dimensional selenium nanosheet;
[0051] S02, dispersing the two-dimensional selenium nanosheets in an organic solvent to form a two-dimensional selenium nanosheet dispersion, uniformly coating the two-dimensional selenium nanosheet dispersion on a conductive substrate, and drying the two-dimensional selenium nanosheet dispersion on the conductive substrate Form a semiconductor layer on it to obtain a working electrode;
[0052] S03, providing a counter electrode, assembling the working electrode and the counter electrode, so that the working electrode and the counter electrode form a sandwich structure with a cavity in the middle; then inject el...
Embodiment 1
[0077] A preparation method of two-dimensional selenium nanosheets, comprising the following steps:
[0078] (1) Add 500 mg of amorphous selenium particles into 100 ml of isopropanol. Then select the probe ultrasound 200W, ultrasound 12h. The ultrasonic on / off time was selected as 2 / 4s, and the ultrasonic was performed in an ice bath environment. After the probe is sonicated, the water bath is then used for sonication. The ultrasonic power of the water bath is 300W. Ultrasonic time is 8h. The temperature of the water bath was maintained at 10°C;
[0079] (2) Centrifuge after ultrasonication. Firstly, a centrifugal force of 2 kg is used for centrifugation for 30 minutes. Take the supernatant, and then continue to centrifuge the supernatant with a centrifugal force of 10 kg for 30 minutes to obtain a precipitate, and obtain an amorphous two-dimensional selenium nanosheet after vacuum drying.
[0080] figure 2 It is an electron microscope topography image of the two-dime...
Embodiment 2
[0083] A preparation method of two-dimensional selenium nanosheets, comprising the following steps:
[0084] (1) Add 500 mg of selenium particles with crystal structure to 100 mL of N-methylpyrrolidone. Then select the probe ultrasound 200W, ultrasound 12h. The ultrasonic on / off time was selected as 2 / 4s, and the ultrasonic was performed in an ice bath environment. After the probe is sonicated, the water bath is then used for sonication. The ultrasonic power of the water bath is 300W. Ultrasonic time is 10h. The temperature of the water bath was maintained at 15°C;
[0085] (2) Centrifuge after ultrasonication. Firstly, a centrifugal force of 1.8 kg is used, and the centrifugation is performed for 35 minutes. Take the supernatant, and then continue to centrifuge the supernatant with a centrifugal force of 10 kg for 25 minutes to obtain a precipitate, and obtain a two-dimensional selenium nanosheet with a crystal structure after vacuum drying.
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