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Nanotube array/nanowire composite structure, preparation method, quantum dot sensitized composite structure and application

A technology of quantum dot sensitization and nanotube array, applied in the field of quantum dot sensitization composite structure, preparation, nanotube array/nanofilament composite structure, can solve the problem of small light absorption area, small effective specific surface area of ​​nanotube structure, limitation application and other issues, to achieve the effect of increasing the refractive index, huge specific surface area, and improving utilization efficiency

Inactive Publication Date: 2021-03-02
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many deficiencies in the nanotube array, mainly because: on the one hand, the effective specific surface area of ​​the nanotube structure is small, so the light absorption area is small; on the other hand, the single TiO 2 Due to its wide band gap (3.2eV, anatase), NTs can only absorb ultraviolet light with a short wavelength, and less than 5% of sunlight can be used by it, which greatly limits its photoelectrochemical application. application

Method used

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  • Nanotube array/nanowire composite structure, preparation method, quantum dot sensitized composite structure and application
  • Nanotube array/nanowire composite structure, preparation method, quantum dot sensitized composite structure and application
  • Nanotube array/nanowire composite structure, preparation method, quantum dot sensitized composite structure and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] An in-situ preparation of TiO 2 The method for NWs / NTs composite structure, is characterized in that, comprises the steps:

[0045] (1) Preparation of TiO 2 NWs / NTs. The cut Ti slices (3 cm × 3 cm × 0.01 cm) were ultrasonically cleaned in acetone, ethanol, and deionized water for 10 min, and then dried. Put the cleaned Ti sheet in the polishing solution (HF:HNO 3 :H 2 (O=1:4:10) was polished for 40s, ultrasonicated in ethanol and deionized water for 10min respectively, and then the Ti sheet was anodized using a DC stabilized power supply, with the Ti sheet as the working electrode (anode), and the Pt sheet electrode As the cathode, the electrolyte contains 0.3wt% NH 4 F +2vol%H 2 O in 120mL ethylene glycol solution, the entire anodic oxidation process lasted 5h at a voltage of 55V. After the electrolysis, the samples were rinsed with ethanol and deionized water several times, dried, and then placed in a tube furnace, heated to 500 °C at a heating rate of 5 °C / min...

Embodiment 2

[0047] CdS quantum dots sensitized TiO 2 NWs / NTs (CdS / TiO 2 The preparation method of NWs / NTs) structure is characterized in that, comprises the steps:

[0048] (1) TiO 2 The preparation method of NWs / NTs is the same as the step (1) of Example 1.

[0049] (2) Using the continuous ion layer adsorption and reaction (SILAR) chemical bath precipitation method, the TiO obtained in step (1) 2 The front of the NWs / NTs sample was immersed in a solution containing 0.1mol·L -1 CdCl 2 In the ethanol solution, the immersion time was 5min, then the sample was taken out and rinsed with ethanol for 5 times and then dried; then the sample was -1 Na 2 S in a methanol solution, immersed for 5 min, the sample was taken out and rinsed with methanol for 5 times and then dried; finally, the sample was placed in a vacuum environment at 350°C for 1 h, and a sample CdS(1cycle) / TiO 2 NWs / NTs. The deposition process can also be repeated many times, usually 3 to 5 deposition cycles.

Embodiment 3

[0051] CdSe Quantum Dots Sensitized TiO 2 NWs / NTs (CdSe / TiO 2 The preparation method of NWs / NTs) structure is characterized in that, comprises the steps:

[0052] (1) TiO 2 The preparation steps of NWs / NTs are the same as step (1) of Example 1.

[0053] (2) the sample TiO obtained in step (1) 2 NWs / NTs were used as working electrodes, and electrochemical deposition was carried out on a CHI 760E electrochemical workstation, and the electrolyte was composed of (10mmol CdCl 2 +0.2mmol SeO 2 +2 mmol Na 2 SO 4 ) dissolved in 120mL deionized water, the Pt sheet is used as the counter electrode, the calomel electrode is used as the reference electrode, the applied voltage is -0.7V, and the deposition time is 10-40 min. After the deposition was completed, the sample was rinsed with deionized water and alcohol for 5 times, dried at 60°C, and then placed in a vacuum environment for high temperature treatment at a temperature of 350°C, holding time 1h, and cooled in the furnace to...

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Abstract

The invention relates to the field of nanomaterials, in particular to a nanotube array / nanowire composite structure, a preparation method, a quantum dot sensitized composite structure and applications. TiO prepared by this method 2 The photocurrent density of nanotube array / nanowire composite structure is higher than that of single TiO 2 8-fold improvement in nanotubes; CdSe / CdS / TiO after quantum dot sensitization 2 NWs / NTs (CdSe / CdS quantum dots co-sensitized TiO 2 nanotube array / nanowire composite structure) photocurrent density ratio of TiO 2 NWs / NTs improved by 15 times than ordinary TiO 2 NTs increased by 27 times; in addition, the photodegradation rate of methylene blue in this sample reached 99.77% within 120 min, and the degradation rate remained 97.84% after 5 repeated uses. Therefore, it has great application prospects in the fields of solar cells and photocatalytic degradation of organic pollutants.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a nanotube array / nanofilament composite structure, a preparation method, a quantum dot sensitized composite structure and applications. Background technique [0002] TiO 2 Due to their good photostability, low toxicity, and relatively low price, nanomaterials are widely used in the field of optoelectronics and environmental protection, making them a research hotspot in the fields of optoelectronics and photocatalysis. [0003] Currently, TiO 2 The morphology structure mainly includes TiO 2 Nanoparticles, nanotubes, nanospheres, nanorods, and nanowires. Among them, TiO prepared by anodic oxidation 2 Nanotubes (NTs) exhibit a highly ordered array structure with high electron transport efficiency, and TiO 2 NTs are easy to make large-area two-dimensional thin film materials to meet the needs of large-scale materials and recycling in the photoelectric / photocatalytic field, so they a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26B82Y40/00H01L31/0264H01L31/0352B01J27/057C02F1/30C02F101/36C02F101/38
CPCH01L31/0264H01L31/035218C25D11/26B82Y40/00C02F1/30B01J27/0573C02F2305/10C02F2101/36C02F2101/38C02F2101/40C02F2101/308B01J35/23B01J35/39
Inventor 林华张萌徐萌毛舟周宁静
Owner SOUTHWEST UNIV
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