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Method for preparing nanometer nickel oxide and application of method

A nano-nickel oxide, aging treatment technology, applied in nickel oxide/nickel hydroxide, electrochemical variables of materials, etc., can solve the problems of difficult mass production, harsh reaction conditions, complicated experimental process, etc., and achieve large-scale industrial production. , The effect of low product cost and simple process

Inactive Publication Date: 2012-07-25
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these preparation methods, the required instruments are expensive, the experimental process is complicated, the reaction conditions are harsh, and it needs to be carried out under high temperature and high pressure, and it has great environmental pollution, high energy consumption, and low yield, so it is difficult to achieve large-scale production.

Method used

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  • Method for preparing nanometer nickel oxide and application of method
  • Method for preparing nanometer nickel oxide and application of method
  • Method for preparing nanometer nickel oxide and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 Weigh 29.5 g of sodium chloride and 1.375 g of ammonium chloride. 0.2g of sodium hydroxide was dissolved in 250ml of deionized water to prepare a solution with PH=10. Then take out 80ml of the solution, insert two nickel wires at both ends of the electrode, the distance between the electrodes is 3cm. A voltage of 5V was added to the two ends of the electrode, the voltage was applied for 12 minutes, and then centrifuged, dried, and then annealed in the air at 300°C for 2 hours to finally obtain nano-nickel oxide. Refer to figure 2 As shown, the obtained product is a nickel oxide nanosheet with regular morphology and uniform size. Refer to image 3 The XRD pattern of the sample shows that the product obtained is cubic nickel oxide with higher purity and better crystallinity. Refer to Figure 4 The HRTEM results of the sample show that the obtained nickel oxide nanosheets are polycrystalline nickel oxide nanosheets composed of crystal grains with a size range ...

Embodiment 2

[0046] Example 2 Dissolve 29.5 g of sodium chloride, 1.375 g of ammonium chloride, 0.2 g of sodium hydroxide, and 0.1 g of sodium oxalate in 250 ml of deionized water. Using the method of Example 1 to prepare nano-nickel hydroxide, nickel hydroxide nano-sheets of uniform size are formed. Then, an annealing treatment is carried out at 500°C in the air for 2 hours, and finally nickel oxide nanosheets are obtained.

Embodiment 3

[0047] Example 3 Add 29.5g of sodium chloride, 1.375g of ammonium chloride, 2.0625ml of ammonia, 0.2g of sodium hydroxide to 250ml of deionized water, and then stir them to prepare nanohydroxide by the method of Example 1. Nickel forms spherical nickel hydroxide particles. It is annealed to prepare spherical nano-nickel oxide (see Image 6 ), mix the nano-nickel oxide with water at 0.5-2g / ml, and coat it on the surface of the sensor substrate, and then age it at 200-400℃ to make a formaldehyde sensor, and then detect the formaldehyde. It can realize highly sensitive detection of 1-1000 ppm formaldehyde gas.

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Abstract

The invention discloses a method for preparing nanometer nickel oxide and application of the method. The method includes adding a certain quantity of inorganic salt and organic liquor into aqueous liquor to be used as electrolyte; using metal nickel as an electrode; applying voltage to two ends of the electrode; forming nickel hydroxide nano-particles by means of regulating the concentration of the electrolyte, the amplitude of the voltage, the reaction time and the stirring speed; then annealing the nickel hydroxide nano-particles at the temperature of 300 DEG C; and obtaining the nickel hydroxide nano-particles. A formaldehyde sensor built on the basis of the nanometer nickel oxide can be used for detecting formaldehyde gases with different concentrations. The method has the advantages that the nanometer nickel oxide is prepared in the electro-chemical method the nanometer nickel oxide is used for building the formaldehyde sensor, a process is simple, operation is convenient, environmental pollution is prevented, the cost of a product is low, repeatability is good, and the method is applicable to large-scale industrial production.

Description

technical field [0001] The invention particularly relates to an electrochemical preparation method of nano-nickel oxide and its application in the preparation of formaldehyde sensors. Background technique [0002] Nickel oxide is an important wide-bandgap semiconductor material. Due to its unique physical and chemical properties, it is widely used in stainless steel, catalysis, gas sensing, capacitors, batteries and other fields. In recent years, with the development of nanoscience and nanotechnology, it has been found that nanoscale materials have a series of characteristics such as quantum size effects, surface and interface effects, and macroscopic quantum tunneling effects, and show better performance than traditional materials in many fields. Therefore, the preparation, characterization and related performance research of nanoscale nickel oxide have received widespread attention. So far, people have prepared nano-nickel oxide by various physical and chemical methods su...

Claims

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Application Information

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IPC IPC(8): C01G53/04G01N27/26
Inventor 张珽李光辉王学文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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