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Two-dimensional ZnS/ZnO/ZnS nanosheet photocatalyst and preparation method thereof

A technology of photocatalysts and nanosheets, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of good repeatability, controllable thickness, and increased light absorption area

Inactive Publication Date: 2018-08-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical problem of two-dimensional zinc oxide nanomaterials that cannot be obtained by the existing synthesis process, the present invention provides a gas-phase synthesis of two-dimensional ZnS / ZnO / ZnS nanosheet photocatalyst and its preparation method, which utilizes thermal evaporation of zinc in the gas phase Powder, supplemented with carbon disulfide or sulfur dioxide active gas to obtain nanosheet templates, and ZnS / ZnO / ZnS nanosheets were obtained by oxidation annealing

Method used

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  • Two-dimensional ZnS/ZnO/ZnS nanosheet photocatalyst and preparation method thereof
  • Two-dimensional ZnS/ZnO/ZnS nanosheet photocatalyst and preparation method thereof
  • Two-dimensional ZnS/ZnO/ZnS nanosheet photocatalyst and preparation method thereof

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Embodiment 1

[0030] A method for preparing ultra-thin two-dimensional ZnS / ZnO / ZnS sandwich structure nanosheet material by vapor phase synthesis. The specific method steps are as follows: use a balance to weigh 1g of Zn powder as a raw material in a small porcelain boat, and place it in a double-temperature zone vacuum tube furnace. In the first temperature zone, the FTO glass (fluorine-doped SnO 2 Conductive glass) is placed in the second temperature zone as the growth substrate, and then the vacuum tube furnace with dual temperature zones is evacuated to 0.1 Torr; nitrogen gas is introduced, the gas flow rate is controlled to 400 sccm, and the time is 10s, and then the carrier gas is closed and vacuumized to 0.2Torr, repeat this step 3 times; feed N into the double temperature zone vacuum tube furnace 2 and CS 2 , control N2 Flow rate is 40sccm, CS 2 The flow rate is 10sccm, and the pressure of the double-temperature zone vacuum tube furnace is adjusted to 2Torr; the temperature of the...

Embodiment 2

[0036] A method for preparing ultra-thin two-dimensional ZnS / ZnO / ZnS sandwich structure nanosheet material by vapor phase synthesis. The specific method steps are as follows: use a balance to weigh 2g of Zn powder as a raw material in a small porcelain boat, and place it in a double-temperature zone vacuum tube furnace. In the first temperature zone, the FTO glass (fluorine-doped SnO 2 Conductive glass) is placed in the second temperature zone as the growth substrate, and then the vacuum tube furnace with dual temperature zones is evacuated to 0.1 Torr; nitrogen gas is introduced, the gas flow rate is controlled to 400 sccm, and the time is 10s, and then the carrier gas is closed and vacuumized to 0.2Torr, repeat this step 3 times; feed N into the double temperature zone vacuum tube furnace 2 and SO 2 , control N 2 The flow rate is 40sccm, SO 2 The flow rate is 5 sccm, and the pressure of the dual-temperature zone vacuum tube furnace is adjusted to 1.8 Torr; the temperature...

Embodiment 3

[0039] A method for preparing ultra-thin two-dimensional ZnS / ZnO / ZnS sandwich structure nanosheet material by vapor phase synthesis. The specific method steps are as follows: Use a balance to weigh 3g of Zn powder as a raw material in a small porcelain boat, and place it in a vacuum tube furnace with two temperature zones. In the first temperature zone, the FTO glass (fluorine-doped SnO 2 Conductive glass) is placed in the second temperature zone as the growth substrate, and then the vacuum tube furnace with dual temperature zones is evacuated to 0.3 Torr; nitrogen gas is introduced, the gas flow rate is controlled to 400 sccm, and the time is 10s; finally, the carrier gas is turned off and the vacuum is evacuated to 0.2Torr; repeat this step 3 times; feed N into the double temperature zone vacuum tube furnace 2 and SO 2 , control N 2 The flow rate is 50sccm, SO 2 The flow rate is 20sccm, and the pressure of the dual-temperature zone vacuum tube furnace is adjusted to 2.5To...

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Abstract

The invention belongs to the technical field of photocatalysts, and discloses a two-dimensional ZnS / ZnO / ZnS nanosheet photocatalyst and a preparation method thereof. The nanosheet is a sandwich structure formed by sequential arrangement of a ZnS layer, a ZnO layer and a ZnS layer, the nanosheet has a thickness of 5-10 nm and a lateral dimension of 1-10 [mu]m; the outermost ZnS layer has a thickness of 1-2 atomic layers; as a photocatalyst, the nanosheet has a band gap of 2.6-2.8 eV; and the preparation method comprises the steps of performing thermal evaporation on zinc powder in a gas phase,utilizing a carbon disulfide or sulfur dioxide active gas to obtain a nanosheet template, and performing oxidizing annealing to obtain the ZnS / ZnO / ZnS nanosheet. Compared with other ZnO nano materials, the two-dimensional ZnS / ZnO / ZnS nanosheet provided by the invention has the sandwich structure, and has a smaller band gap and a thinner thickness as a photocatalyst; and in addition, the preparation method provided by the invention has a simple process, smart design and low costs, and is safe and controllable.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a two-dimensional zinc oxide nanometer material and a gas-phase synthesis preparation method thereof. Background technique [0002] The era of rapid development also places human society in an environment of energy crisis, and there is an urgent need to vigorously develop renewable energy. Among them, solar energy is an important basic energy source in renewable energy. Low-density solar energy can be converted into high-density hydrogen energy and stored. Therefore, the development of low-cost, high-efficiency large-scale hydrogen production technology has shown great economic and social value. Among many photocatalytic materials for converting solar energy into clean hydrogen energy, zinc oxide (ZnO) is one of the most important semiconductors with wide bandgap (~3.2eV) and suitable redox potential. When irradiated by sunlight, the electrons on the excited v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/02
CPCB01J27/04B01J35/39B01J35/40
Inventor 杜希文张旭
Owner TIANJIN UNIV
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