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Mn-doped zns ultra-thin nanowires selectively absorbing ultraviolet light in the solar blind zone and its preparation method and application

A technology of ultra-fine nanometer and ultraviolet light, which is applied in the direction of nanotechnology, nanotechnology, nano-optics, etc., can solve difficult problems such as fluorescence emission performance, and achieve the effect of high selective absorption

Active Publication Date: 2020-09-01
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it is difficult for ultra-thin nanowires to have good fluorescence emission properties due to the presence of many surface defects.
It is precisely because of the difficulty of ultra-fine nanowire diameter control and its structural fragility that it is necessary to comprehensively consider the influence of various reaction process parameters on the quality, structural stability and optical properties of the product nanowire, so its synthesis and the control of optical properties are extremely challenging

Method used

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  • Mn-doped zns ultra-thin nanowires selectively absorbing ultraviolet light in the solar blind zone and its preparation method and application
  • Mn-doped zns ultra-thin nanowires selectively absorbing ultraviolet light in the solar blind zone and its preparation method and application
  • Mn-doped zns ultra-thin nanowires selectively absorbing ultraviolet light in the solar blind zone and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Example 1 Preparation of Mn-doped ZnS ultra-fine nanowires capable of selectively absorbing ultraviolet light in the UVC band

[0042] Put metal precursors with higher reactivity, non-metal precursors with better activity, dopants and organic ligand solutions into an autoclave, and react at 50-100°C under solvothermal conditions protected by inert gas6 ~40h, the Mn-doped ZnS ultrafine nanowires can be obtained.

[0043] According to a specific embodiment of the present invention, the amount of the metal precursor used is 0.2-1 mmol. Those of ordinary skill in the art can understand that the amount of the precursor can be used in any value within the range of 0.2-1 mmol. For example, the amount can be selected 0.4, 0.6 or 0.8 mmol.

[0044] According to a specific embodiment of the present invention, the metal precursor is zinc ethyl xanthate, zinc diethyldithiocarbamate, zinc nitrate or zinc stearate.

[0045] According to a specific embodiment of the present inventio...

Embodiment 2

[0056] Example 2 Preparation of ZnSe ultra-fine nanowires that can strongly absorb ultraviolet light in the UVB band

[0057] Unless the metal precursor is selected as 0.1-1mmol selenium powder or selenourea or selenium dioxide, 0.4-1mL activation reagent (organometallic borohydride or C 8 ~C 18 Alkylamine), the reaction temperature is 160-220°C, the reaction time is 5-14h and no need to add a small amount of dopant, other synthesis is the same as in Example 1.

[0058] figure 1 and Figure 4 The absorption spectrum and transmittance spectrum of the ZnSe ultra-fine nanowires prepared for the examples are shown in the figure, and it can be known that the ZnSe ultra-fine nanowires can selectively absorb ultraviolet light in the UVB band.

[0059] Figure 5 It is the fluorescence spectrum of ZnSe ultra-fine nanowires, and it can be seen from the figure that green-emitting ZnSe ultra-fine nanowires are prepared according to the embodiment of the present invention.

Embodiment 3

[0060] Example 3 Preparation of ZnTe ultra-fine nanowires that can strongly absorb ultraviolet light in the UVA band

[0061] Unless the metal precursor is selected as 0.1-1.0mmol tellurium powder or tellurium dioxide or sodium tellurite, 0.4-1mL activation reagent (organometallic borohydride or C 8 ~C 18 Alkylamine), the reaction temperature is 160-220°C, the reaction time is 5-16h and no need to add a small amount of dopant, other synthesis is the same as in Example 1.

[0062] figure 1 and Figure 4 The absorption spectrum and transmittance spectrum of the ZnTe ultrafine nanowires prepared for the example are shown in the figure, and it can be known that the ZnTe ultrafine nanowires can selectively absorb ultraviolet light in the UVA band.

[0063] Figure 5 It is the fluorescence spectrum of the ZnTe ultra-fine nanowires. It can be seen from the figure that blue light-emitting ZnTe ultra-fine nanowires are prepared according to the embodiment of the present invention. ...

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Abstract

The invention relates to the field of nano-materials, in particular to Mn-doped ZnS ultra-fine nanowires capable of selectively absorbing ultraviolet light in a solar blind area as well as a preparation method and an application of the Mn-doped ZnS ultra-fine nanowires. The Mn-doped ZnS ultra-fine nanowires are prepared by low-temperature in-situ assembly growth and controllable doping, have diameter of 0.8 nm and band gap of 4.44 eV and can absorb ultraviolet light in the solar blind area (namely, UVC wave band) with high selectivity; besides, the nanowire can also emit red-orange fluorescence with higher quantum yield by Mn ion doping. A photochromic card constructed by combining the Mn-doped ZnS ultra-fine nanowires with ZnSe and ZnTe ultra-fine nanowires can realize visual detection ofultraviolet light in UVC, UVB and UVA bands, and has the characteristics of low cost, visualization, portability, fast detection and the like.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a Mn-doped ZnS ultrafine nanowire which selectively absorbs ultraviolet light in a solar blind zone and a preparation method and application thereof. Background technique [0002] Ultraviolet rays include three radiation bands, namely short-wave ultraviolet rays, namely UVC 220-290nm; medium-wave ultraviolet rays, namely UVB, 290-320nm; and long-wave ultraviolet rays, namely UVA, 320-400nm. When solar ultraviolet radiation passes through the atmosphere, the ozone layer in the atmosphere has a strong absorption effect on 200-290nm ultraviolet radiation. This band of ultraviolet radiation hardly exists in the near-earth atmosphere. Because the solar radiation in this band is in the atmosphere, especially It is basically zero in the atmosphere near sea level, so this band is not affected by solar radiation, forming the so-called solar blind zone. [0003] Compared with UVB and UV...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/57C09K11/88G01J1/50B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/574C09K11/883G01J1/50
Inventor 李运超李冬邢观洁蔡文昊
Owner BEIJING NORMAL UNIVERSITY
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