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  • In conclusion, CuO nanostructures have been widely studied. They are receiving more and more attention from material scientists and engineers recently because of their interesting properties and potential applications in various fields. This study summarizes the influences of different factors of the synthesis process, some unique properties, and some promising applications of CuO nanostructures. We focus on some synthetic chemical strategies, the associated influence of essential factors of syn Apart from improving the field emission efficiency by optimizing the aspect ratio (length/diameter) of 1D nanostructures, other methods were also used to enhance the field emission current. Wang and Li found that laser irradiation could effectively improve the field emission current of CuO nanowire arrays. The effects of laser intensity, wavelength, emission current, and working vacuum on the enhancement have been investigated in detail. Among these factors, the contribution from extra excited e Field emission displays are now more dominant in the market than CRT displays because of their advanced properties, such as high brightness, good color rendition, short response time, and low power consumption. Among the various nanomaterials studied for field emission applications, 1D nanostructures of CuO emerged as excellent field emitters because of some advantages: common turn-on field, high current density, and low fabrication cost. Liu et al. Investigated the field emission properties of CuO nanomaterials could also be a good substitution for expensive noble metal cathodes in dye solar cells. This topic was first introduced by Anandan et al. In 2005, the optimal power conversion efficiency when using CuO nanorods as electrodes was 0.29% compared with 1.23% when using Pt as an electrode in the same condition, using CuO nanoneedles of the higher surface active area, Liu et al. They obtained an efficiency of 1.12% for TiO2-based dye solar cells. This result shows that nanomaterials CuO could also be a good candidate in solar energy conversion due to many properties: high absorption coefficient, narrow bandgap in the visible region, which is expected to give high conversion efficiency, being nontoxic, stable, good electrical conductance, simple manufacturing process, and so on. A more direct way to convert solar energy to electricity is to use CuO as an absorber in solar cells. The efficiency of solar cells based on CuO is far lower than that of leading chalcogenide systems The unique antimicrobial copper oxide is a new generation - ultra-fine copper oxide powder prepared by nanotechnology. The nanometer-grade copper oxide powders are modified with small particle sizes and concentrations. Problems such as discoloration, rapid migration, and notching of other antimicrobial powders are thus solved. It has a strong antibacterial effect on all pathogenic bacteria, such as Escherichia Coli, Staphylococcus aureus, Candida albicans, etc. It has a broad spectrum of sterili Both sides (5 mm in diameter) of a silver-coated quartz crystal microbalance (QCM) resonator were covered with CuO nanostructures; the resonator was used as a sensing probe in a quartz crystal resonator. The resonant frequency shift indicates the absorbance of HCN gas on the sensor. As the specific area of CuO nanostructure used for coating the probe changes from 9.3 m2/g to 1.5 m2/g, the sensitivity reduces from 2.26 to 0.31 Hz/μg. In both reports, the authors showed that the sensitivity of sen CuO first attracted the attention of chemists as a suitable catalyst in organic reactions but recently discovered applications of CuO, such as high-Tc superconductors, gas sensors, solar cells, emitters, and electronic cathode materials, also make this material a hot topic for physicists and materials science engineers. Some of the most exciting applications of CuO nanomaterials are sensing, photocatalyst, and supercapacitor, which will be highlighted in this section. It is surface conductivity A hysteresis loop of weak ferromagnetism was observed at 5 K in CuO nanosheets prepared by hydrothermal synthesis by the group of Zhao et al. [47]. Temperature dependence of magnetization showed the Neel temperature of CuO nanosheets of 219 K. The FC and ZFC data show pronounced maxima at about 40 K, which probably corresponded to blocking temperatures. Below 40 K, the magnetization increases rapidly in FC data which reconfirms the existence of weak ferromagnetism in CuO nanosheets. The influenc Besides emissions in the visible or IR region, other authors announced emissions in the UV region. Santra et al. Observed the near band edge emission at 395 nm in the violet part. Aslani reported near-band edge emission at 300 nm. Maheshwari and Sathvamoorthy said several photoluminescence peaks at 325, 339, and 356 nm. They explained the difference in photoluminescence emission peaks of CuO as agreed with earlier reports by various sizes and shapes of CuO nanostructures. This fact indicates tha

CuO nanostructures have been widely studied

In conclusion, CuO nanostructures have been widely studied. They are receiving more and more attention from material scientists and engineers recently because of their interesting properties and potential applications in various fields. This study summarizes the influences of different factors of the synthesis process, some unique properties, and some promising applications of CuO nanostructures. We focus on some synthetic chemical strategies, the associated influence of essential factors of syn

More>>

CuO nanowire arrays

Apart from improving the field emission efficiency by optimizing the aspect ratio (length/diameter) of 1D nanostructures, other methods were also used to enhance the field emission current. Wang and Li found that laser irradiation could effectively improve the field emission current of CuO nanowire arrays. The effects of laser intensity, wavelength, emission current, and working vacuum on the enhancement have been investigated in detail. Among these factors, the contribution from extra excited e

More>>

Field Emission Effect of CuO

Field emission displays are now more dominant in the market than CRT displays because of their advanced properties, such as high brightness, good color rendition, short response time, and low power consumption. Among the various nanomaterials studied for field emission applications, 1D nanostructures of CuO emerged as excellent field emitters because of some advantages: common turn-on field, high current density, and low fabrication cost. Liu et al. Investigated the field emission properties of

More>>

CuO nanomaterials could also be used as good substitution for expensive noble metal cathode in dye solar cell

CuO nanomaterials could also be a good substitution for expensive noble metal cathodes in dye solar cells. This topic was first introduced by Anandan et al. In 2005, the optimal power conversion efficiency when using CuO nanorods as electrodes was 0.29% compared with 1.23% when using Pt as an electrode in the same condition, using CuO nanoneedles of the higher surface active area, Liu et al. They obtained an efficiency of 1.12% for TiO2-based dye solar cells. This result shows that nanomaterials

More>>

CuO could also be good candidate in solar energy conversion due to many properties

CuO could also be a good candidate in solar energy conversion due to many properties: high absorption coefficient, narrow bandgap in the visible region, which is expected to give high conversion efficiency, being nontoxic, stable, good electrical conductance, simple manufacturing process, and so on. A more direct way to convert solar energy to electricity is to use CuO as an absorber in solar cells. The efficiency of solar cells based on CuO is far lower than that of leading chalcogenide systems

More>>

Antibacterial CuO

The unique antimicrobial copper oxide is a new generation - ultra-fine copper oxide powder prepared by nanotechnology. The nanometer-grade copper oxide powders are modified with small particle sizes and concentrations. Problems such as discoloration, rapid migration, and notching of other antimicrobial powders are thus solved. It has a strong antibacterial effect on all pathogenic bacteria, such as Escherichia Coli, Staphylococcus aureus, Candida albicans, etc. It has a broad spectrum of sterili

More>>

Silver coated quartz crystal microbalance resonator were covered with CuO nanostructures

Both sides (5 mm in diameter) of a silver-coated quartz crystal microbalance (QCM) resonator were covered with CuO nanostructures; the resonator was used as a sensing probe in a quartz crystal resonator. The resonant frequency shift indicates the absorbance of HCN gas on the sensor. As the specific area of CuO nanostructure used for coating the probe changes from 9.3 m2/g to 1.5 m2/g, the sensitivity reduces from 2.26 to 0.31 Hz/μg. In both reports, the authors showed that the sensitivity of sen

More>>

Applications of CuO Nanoparticles

CuO first attracted the attention of chemists as a suitable catalyst in organic reactions but recently discovered applications of CuO, such as high-Tc superconductors, gas sensors, solar cells, emitters, and electronic cathode materials, also make this material a hot topic for physicists and materials science engineers. Some of the most exciting applications of CuO nanomaterials are sensing, photocatalyst, and supercapacitor, which will be highlighted in this section. It is surface conductivity

More>>

Hysteresis loop of weak ferromagnetism was observed at 5 K in CuO nanosheets

A hysteresis loop of weak ferromagnetism was observed at 5 K in CuO nanosheets prepared by hydrothermal synthesis by the group of Zhao et al. [47]. Temperature dependence of magnetization showed the Neel temperature of CuO nanosheets of 219 K. The FC and ZFC data show pronounced maxima at about 40 K, which probably corresponded to blocking temperatures. Below 40 K, the magnetization increases rapidly in FC data which reconfirms the existence of weak ferromagnetism in CuO nanosheets. The influenc

More>>

The difference photoluminescence emission peaks of CuO

Besides emissions in the visible or IR region, other authors announced emissions in the UV region. Santra et al. Observed the near band edge emission at 395 nm in the violet part. Aslani reported near-band edge emission at 300 nm. Maheshwari and Sathvamoorthy said several photoluminescence peaks at 325, 339, and 356 nm. They explained the difference in photoluminescence emission peaks of CuO as agreed with earlier reports by various sizes and shapes of CuO nanostructures. This fact indicates tha

More>>

The electronic structures of CuO

Though the origin of deep-level emission in CuO is under debate, and little information is available on the CuO defect structure, the deep emissions are generally supposed to relate to defects in CuO nanomaterial. CuO is intrinsically a p-type semiconductor due to the existence of Cu vacancies. However, recent theoretical calculations indicate that although Cu vacancies are the most stable defects in CuO, they do not change the electronic structures of CuO. Otherwise, oxygen vacancies or OCu ant

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Optical property of CuO nanostructures

Compared with other properties such as electrical conductivity and field emission, CuO nanostructures' optical properties have been much less investigated and discussed. As a p-type semiconductor, a narrow bandgap of around 1.2 eV was reported for bulk CuO. Reported bandgap values for CuO needed to be in better agreement; for example, a bandgap in the range of 1.56 and 1.85 eV was reported for CuO thin films. In addition, the variation of bandgap could also relate to the quantum size effect in d

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