Copper oxide powder is a brown-black metal oxide powder with a wide range of uses. Ordinary copper oxide is a multifunctional fine inorganic material with a wide range of uses, mainly used in printing and dyeing, glass, ceramics, medicine, catalysis and other fields. It can be used as a catalyst and catalyst carrier and electrode activation material, and also as a rocket propellant. As the main component of the catalyst, copper oxide powder is used as a variety of catalysts for oxidation, hydrogenation, NO, CO, reduction, and hydrocarbon combustion. It is widely used in the reaction. Nano copper oxide  powder has better catalytic activity, selectivity and other properties than large-size copper oxide powder. The particle size of nano-copper oxide is between 1-100nm. Compared with ordinary copper oxide, it has special electrical, optical, catalytic and other properties. The electrical properties of nano-copper oxide make it very sensitive to external environments such as temperature, humidity, light, etc. Therefore, the use of nano-copper oxide particles to coat the sensor can greatly improve the response speed, sensitivity and selectivity of the sensor. The spectral properties of nano-copper oxide show that its infrared absorption peak is obviously broadened, and there is an obvious blue shift phenomenon. Nano-preparation of copper oxide found that nano-copper oxide with smaller particle size and better dispersion has higher catalytic performance for ammonium perchlorate.

2. Application examples of nano-copper oxide

1. As a catalyst and desulfurizer

Cu is a transition metal. It has a special electronic structure and electronic gain and loss properties that are different from other metals. It can show good catalysis for different chemical reactions and is widely used in the field of catalysts. When the size of CuO particles is as small as nanometers, due to the special characteristics of multiple surface free electrons and high surface energy of nanomaterials, they can exhibit higher catalytic activity and more peculiar catalytic phenomena than conventional CuO. Nano CuO is an excellent desulfurization product, which can exhibit excellent activity at room temperature, and the removal accuracy of H2S can reach below 0.05 mg·m-3. After optimization, the penetration sulfur capacity of nano CuO reaches 25.3% at a space velocity of 3 000 h-1, which is higher than other desulfurization products of the same type.

2. The anti-bacterial properties of nano CuO


The antibacterial process of metal oxides can be simply described as: under the excitation of light with energy greater than the band gap, the generated hole-electron pairs interact with O2 and H2O in the environment, and the generated free radicals such as active oxygen and organic molecules in the cell A chemical reaction occurs, which breaks down the cells and achieves the purpose of antibacterial [26]. Since CuO is a p-type semiconductor, it has holes (CuO) +, which may interact with the environment to play an antibacterial or antibacterial effect. Studies have shown that nano-CuO has good antibacterial ability against pneumonia and Pseudomonas aeruginosa.

3. The application of nano CuO in sensors

Sensors can be roughly divided into physical sensors and chemical sensors. A physical sensor is a device that converts physical quantities such as light, sound, magnetism, or temperature from the outside into electrical signals. Chemical sensors are devices that convert the types and concentrations of specific chemical substances into electrical signals. It is mainly used to design chemical sensors by directly or indirectly causing changes in electrical signals such as electrode potential when the sensitive material and the molecules, ions, etc. in the measured substance are in contact with each other. Because the external signal can be converted into an electrical signal to indicate, the sensor is widely used in many fields such as environmental monitoring, medical diagnosis, and meteorology.

Nano CuO has the advantages of high specific surface area, high surface activity, specificity and extremely smallness, which makes it very sensitive to the external environment such as temperature, light and moisture, and its application in the sensor field can greatly improve the response of the sensor Speed, sensitivity and selectivity.

3. Characterization method of nano copper oxide powder particles

The size and shape of nano particles significantly affect the properties and uses of nano powder and its products. Therefore, nano powder measurement technology plays an important role in the research and development of nano powder technology. A variety of particle size measurement methods have been developed, and these methods have been continuously improved and perfected in practice. The analysis, testing and characterization of common nano-copper oxide are shown in the following table:

Detection method

Physical and chemical characterization

Transmission electron microscope (TEM)

Morphology and size of particle size

X-ray diffraction (XRD)

The crystal type and size of the particles

Scanning Electron Microscope (SEM)

Agglomerate morphology and size

Atomic emission spectroscopy (AAS)

Qualitative and quantitative analysis of particle chemical composition

Infrared spectroscopy (IR)

Intermediate structure of particles, structure of particles

X-ray fluorescence (XRFS)

Particle chemical composition

Thermogravimetric analysis (TG)

Desorption and decomposition reaction mechanism of adsorbate on particle surface

Differential Thermal Analysis (DTA)

Crystal transition temperature of particles

EDTA chemical analysis

Particle chemical composition, CuO content

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