Wide-spectrum detector based on copper selenide nanotube or copper selenide/bismuth sulfide nanotube composite material and preparation method thereof
A technology of composite materials and nanotubes, which is applied in the field of semiconductor photodetection devices and its preparation, can solve the problems of difficult preparation of nanotubes and low efficiency of photodetectors, and achieve great development potential, suitable for large-scale production and application, photocurrent high density effect
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Embodiment 1
[0036] a Cu 3 Se 2 The preparation method of nanotube, described method step is as follows:
[0037] Step 1 prepares 180ml of SeO with a concentration of 0.045mol / L 2 and 0.0044mol / L β-cyclodextrin, slowly added to 180ml of ascorbic acid solution with a concentration of 0.028mol / L, and kept stirring for 4h to obtain Se nanoparticles.
[0038] In step 2, Se nanoparticles were evenly dispersed in absolute ethanol, aged for 48 hours under dark light conditions, and Se nanowires were obtained after natural drying.
[0039] Step 3 Prepare 50ml of a mixed solution of 0.075mol / L Se nanowires with a concentration of 0.045mol / L copper nitrate trihydrate, 0.0045mol / L ascorbic acid, and 3ml absolute ethanol; then, heat in a water bath at 98°C for 2h, and wait After the reaction was completed, it was centrifuged twice with deionized water and dried naturally at room temperature to obtain the 2 Se nanostructures.
[0040] In step 4, the synthesized Se@Cu 2 Se nanostructures were anne...
Embodiment 2
[0043] A coaxial core-shell structure Cu 3 Se 2 / Bi 2 S 3 The preparation method of nanotube composite material, described method step is as follows:
[0044] Prepare 80ml (40ml deionized water+40ml ethylene glycol) of 0.04125mol / L thiourea, 0.025mol / L of bismuth nitrate 5 hydrate and 0.3586mmol / L of Cu 3 Se 2 Nanotube mixed solution; at room temperature, the above mixed solution was continuously stirred magnetically for 3 hours. After the reaction was completed, it was washed with deionized water and absolute ethanol for 3 times and then dried naturally to obtain a coaxial core-shell structure Cu 3 Se 2 / Bi 2 S 3 nanotube composites. image 3 and 4 Coaxial core-shell Cu 3 Se 2 / Bi 2 S 3 Low-magnification and high-magnification SEM images of nanotube composites, it can be clearly seen that Cu 3 Se 2 / Bi 2 S 3 The nanotube composites are uniform in size, with a length of about 1 μm and a diameter of about 150 nm. In addition, from high magnification images ( ...
Embodiment 3
[0046] a Cu 3 Se 2 Preparation and testing of nanotube ultraviolet detectors, specifically:
[0047] The Cu synthesized in Example 1 3 Se 2 The nanotubes were dispersed in 2ml of deionized water, evenly drop-coated on the surface of the FTO substrate and dried to prepare Cu 3 Se 2 Nanotube working electrode. Then, the Cu 3 Se 2 The nanotube working electrode and the Pt counter electrode are combined through a heat-sealing film at 145 °C, and the iodine electrolyte is injected into the device to obtain Cu 3 Se 2 Nanotube UV detectors. Under the condition of not setting the bias voltage, the Keithley 2400 digital source meter was used to connect the device, and the light of 365nm was used as the simulated ultraviolet light source to test the Cu 3 Se 2 Detection performance of nanotube UV detectors. Depend on Figure 6 It can be seen that it is obvious that the dark current of the device is almost zero in the initial state; when the ultraviolet light is irradiated, t...
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