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Method for synergistically enhancing photocatalysis of ZnO through plasmon and ammonia passivation

A plasmonic and zinc oxide technology, applied in the field of photocatalysis, achieves the effect of wide application prospects

Inactive Publication Date: 2018-01-16
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there are very few studies on the combination of plasmonics and high-pressure ammonia passivation. The synergy of the two methods to improve the photocatalytic efficiency of the catalyst will be a very challenging process and physical problem.

Method used

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  • Method for synergistically enhancing photocatalysis of ZnO through plasmon and ammonia passivation
  • Method for synergistically enhancing photocatalysis of ZnO through plasmon and ammonia passivation
  • Method for synergistically enhancing photocatalysis of ZnO through plasmon and ammonia passivation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation conditions: room temperature, class 100 clean room;

[0035] The specific steps are:

[0036] (1) Choose a zinc oxide (ZnO) substrate in the (100) crystal phase, with a volume of 10×10×0.5mm 3 ;

[0037] (2) Passivate the zinc oxide substrate with high-pressure ammonia, pass through 0.4MPa high-purity ammonia gas, and heat it in a high-purity ammonia gas environment at 300°C for 30 hours;

[0038] (3) Take out the zinc oxide after ammonia passivation, and let it cool naturally for 12 hours to room temperature;

[0039] (4) Vacuum thermal evaporation treatment is performed on the zinc oxide after ammonia passivation to form a metal nano film;

[0040] (5) Perform annealing treatment on the vapor-deposited zinc oxide, pass high-purity nitrogen gas, and control the flow rate of nitrogen gas to 150ml / min; anneal at 350°C for 5 minutes in a nitrogen environment to form metal nanoparticles. Cool in the tube after power off for 1 hour.

[0041] We characterize...

Embodiment 2

[0043] Preparation conditions: room temperature, class 100 clean room;

[0044] The specific steps are:

[0045] (1) Choose a zinc oxide (ZnO) substrate in the (100) crystal phase, with a volume of 10×10×0.5mm 3 ;

[0046] (2) Passivate the zinc oxide substrate with high-pressure ammonia, pass through 0.8MPa high-purity ammonia gas, and heat it in a high-purity ammonia gas environment at 350°C for 24 hours;

[0047] (3) Take out the zinc oxide after ammonia passivation, and let it cool naturally for 12 hours to room temperature;

[0048] (4) Vacuum thermal evaporation treatment is performed on the zinc oxide after ammonia passivation to form a metal nano film;

[0049] (5) Perform annealing treatment on the evaporated zinc oxide, pass high-purity nitrogen gas, and control the flow rate of nitrogen gas to 100-ml / min;

[0050] Annealing at 400° C. for 4 minutes in a nitrogen environment to form metal nanoparticles. Cool in the tube after power off for 1 hour.

Embodiment 3

[0052] Preparation conditions: room temperature, class 100 clean room;

[0053] The specific steps are:

[0054](1) Choose a zinc oxide (ZnO) substrate in the (100) crystal phase, with a volume of 10×10×0.5mm 3 ;

[0055] (2) Passivate the zinc oxide substrate with high-pressure ammonia, pass through 0.6MPa high-purity ammonia gas, and heat in a high-purity ammonia gas environment at 400°C for 20 hours;

[0056] (3) Take out the zinc oxide after ammonia passivation, and let it cool naturally for 12 hours to room temperature;

[0057] (4) Vacuum thermal evaporation treatment is performed on the zinc oxide after ammonia passivation to form a metal nano film;

[0058] (5) Perform annealing treatment on the vapor-deposited zinc oxide, and anneal at 400° C. for 3 minutes in a nitrogen environment to form metal nanoparticles. Cool in the tube after power off for 1 hour.

[0059] For the materials prepared in Examples 2 and 3, the activity of the photocatalyst was characterized ...

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Abstract

The invention belongs to the technical field of photocatalysis and specifically relates to a method for synergistically enhancing photocatalysis of ZnO through plasmon and ammonia passivation. The method comprises the following steps: performing ammonia passivation treatment on a photocatalytic material, namely ZnO, preparing a metal Ag film on the surface of the photocatalytic material ZnO with athermal induction method and forming metal Ag nano-particles under an annealing condition (the diameter is less than 50 nm.). The doping of nitrogen elements can be achieved through ammonia passivation; due to nitrogen doping, a band gap can be reduced, and visible light photocatalysis is achieved; sunlight with the resonant wavelength within a visible light band (400-700 nm) can be effectively captured through plasmon, so that a light-generated electron hole pair is generated. Therefore, through combination of the two methods of ammonia passivation and plasmon, the photoelectric response andphotocatalysis efficiency of a ZnO photocatalyst can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a zinc oxide photocatalysis method. Background technique [0002] Surface plasmon resonance (SPR), also known as surface plasmon resonance, is a physical optical phenomenon. The related instruments and application technologies have become important tools in the research of physics, chemistry and biology. By constructing a surface composed of metal nanoparticles, the surface plasmon resonance of the local field is realized, and the evanescent wave incident on the surface of the medium is easily matched with the intrinsic wave vector of the metal (nanoparticle) plasma, thereby achieving resonance. The absorption of light at the wavelength is greatly enhanced. The phenomenon of surface plasmon resonance was observed by Wood in the laboratory as early as 1902, but for a long time, this phenomenon has not been well utilized. The most famous application was in the 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/06B01J37/08
Inventor 马磊陆明
Owner FUDAN UNIV
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