Near-field photocatalyst containing zinc bloom nanometer line

A photocatalyst and near-field light technology, which is applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, nanotechnology, etc., can solve problems such as increased production costs, complex devices and processes, and achieve The effect of simplifying production steps and reducing costs

Inactive Publication Date: 2008-08-27
POHANG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an additional external voltage is applied, which makes the device and process of generating hydrogen very complicated, which is undesirable
And, owing to be with rare metal (as platinum) as electrode, production cost has also improved, and this is that we do not wish equally

Method used

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  • Near-field photocatalyst containing zinc bloom nanometer line
  • Near-field photocatalyst containing zinc bloom nanometer line
  • Near-field photocatalyst containing zinc bloom nanometer line

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054] Example 1: Fabrication of photocatalysts containing ZnO nanoneedles (MOCVD)

[0055] The glass substrate was placed in a metal organic chemical vapor deposition (MOCVD) reactor, dimethyl zinc (Zn(CH 3 ) 2 ) and O 2 The gas was fed into the reactor through the respective lines at rates of 0.1-10 sccm and 10-100 sccm, respectively. Along with the above gases, there is also argon (Ar) used as a carrier gas.

[0056] Dimethyl zinc and oxygen were chemically reacted on the glass substrate while maintaining a pressure of 0.2 Torr and a temperature of 500°C in the reactor for one hour to grow and deposit ZnO nanoneedles thereon.

[0057] The ZnO nanoneedles oriented perpendicular to the shape of the substrate on the resulting glass substrate are shown in Figure 6. Each nanoneedle has a diameter of 60 nm, a length of 1D, and a density of 1010 / cm 2 .

example 2

[0058] Example 2: Fabrication of photocatalysts containing ZnO nanoneedles (MOVPE)

[0059] After placing the substrate in the reactor, dimethylzinc (Zn(CH 3 ) 2 ) and O 2 The gas sources are fed through the respective routes at rates of 0.1-10 sccm and 10-100 sccm, respectively, while the substrate temperature is maintained at 400-500°C. In connection with this, argon (Ar) is used as a carrier gas.

[0060] Dimethyl zinc and oxygen were chemically reacted on the glass substrate while maintaining a pressure of 0.2 Torr and a temperature of 500°C in the reactor for one hour to grow and deposit ZnO nanoneedles thereon. As shown in FIG. 7 , nanoneedles with sharp ends perpendicular to the substrate were formed on the substrate.

[0061] Evaluation Example 1

[0062] The ZnO nanoneedles generated in Example 1 and Example 2 were immersed in ultrapure distilled water, and then exposed to He-Cd laser light with a wavelength of 325 nm for 30 seconds. Thereby obtaining superhydro...

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Abstract

Disclosed is a near-field photocatalyst using a ZnO (ZnO) nanowire. The photocatalyst is advantageous in that low-priced zinc is used instead of titanium, conventionally used as a photocatalyst to reduce expenses, and that it is possible to obtain overvoltage which is sufficient to generate hydrogen using an optical near field formed around an end of a ZnO nanowire without the application of additional extenal voltage, thus the use of a costly electrode, such as platinum, is avoided and a process is simplified.

Description

technical field [0001] The present invention generally relates to photocatalysts, in particular to a near-field photocatalyst using ZnO nanowires. Background technique [0002] A photocatalyst is a substance with catalytic properties that can cause a catalytic reaction when light is irradiated onto it. In this specification, it refers to a substance with catalytic properties capable of accelerating photoreaction, in particular, a substance capable of absorbing ultraviolet rays to generate a material with strong oxidizing or reducing ability. Photocatalysts can be used to treat many kinds of chemicals or non-degradable pollutants in an environmentally friendly manner. Among photocatalysts, titanium dioxide is most frequently used because it has excellent acid or alkali resistance and is harmless to humans. [0003] As shown in Figure 1, the titanium dioxide photocatalyst is an n-type semiconductor. When it is exposed to light (such as ultraviolet light) having an energy equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J21/06B82B3/00
Inventor 李奎哲大津元一八井崇
Owner POHANG UNIV OF SCI & TECH
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