What are the properties of ZnO nanoparticles?
ZnO nanoparticles have different shapes (rod-like, star-like and isometric) and a broad size distribution range of 30–150 nm. The ZnO particles were present mainly as clusters. In addition, spherical particles with a size between 200 nm and 1 μm were present.
How do you characterize nanoparticles?
Microscopy methods generate images of individual nanoparticles to characterize their shape, size, and location. Electron microscopy and scanning probe microscopy are the dominant methods. Because nanoparticles have a size below the diffraction limit of visible light, conventional optical microscopy is not useful.
What is the importance of ZnO nanoparticles?
The ZnO nanoparticles constitute an effective antimicrobial agent against pathogenic microorganisms. Basically the detected active oxygen species generated by these metal oxide particles could be the main mechanism of their antibacterial activity.
What type of material is ZnO?
n-type semiconductor
ZnO in organic electronics ZnO is an n-type semiconductor and therefore has been used widely as a semiconducting channel layer in metal oxide-based thin-film transistor (TFTs).
How are particles arranged in nanoparticles?
The nanoparticles swim in oil, which is then dispersed into droplets. Each droplet contains several nanoparticles. “As these droplets evaporate, the space for the nanoparticles is increasingly reduced so that they assemble in an orderly manner and form the ordered clusters”, says Kraus.
What are the tools used to characterize nanomaterials?
Methods and tools for the morphological characterization of nanomaterials include Scanning Electron Microscope (SEM), Field Emission Scanning Electron Microscope (FESEM), Tunneling Electron Microscope (TEM), Atomic Force Microscopy (AFM), etc.
Why do we use ZnO?
The most common use of ZnO nanoparticles is in sunscreen. They are used because they effectively absorb ultraviolet light, but possess a large enough bandgap to be completely transparent to visible light.
How is ZnO prepared?
In the indirect (French) process, metallic zinc is melted in a furnace and vaporized at ca. 910 °C. The immediate reaction of the zinc vapour with oxygen from the air produces ZnO. The particles of zinc oxide are transported via a cooling duct and are collected at a bag filter station.
What are the properties of ZnO?
2.2. Crystal structure of ZnO
| Physical Parameters | Values |
|---|---|
| Density | 5.66 g/cm3 |
| Refractive Index | 2.01 |
| Band Gap | 3.4 eV, Direct |
| Electron effective mass | 0.24 |
What is the ecotoxicity of ZnO nanoparticles?
ECOTOXICITY OF ZNO NANOPARTICLES IS INVESTIGATE BY USING TWO BIOLOGICAL TARGET ‘S o All photosynthetic microorganism were selected should be able to fulfill two conditions: 1. They are able to synthesis some metallic nanoparticles by synthetic route.
How do you make ZnO nanoparticles?
The zinc oxide (ZnO) nanoparticles were prepared by wet chemical method using zinc nitrate and sodium hydroxides precursors and soluble starch as stabilizing agent. Different concentrations of soluble starch (0.1%), were dissolved in 500 ml of distilled water by using microwave oven.
What is the size of zno-2 nanoparticles?
TGA analysis of ZnO-2…………………………………………………….26 ABSTRACT The ZnO nanoparticles were prepared by two different methods where the size of the particles formed were found to be 320 nm and 559 nm studied by the particle size analyzer. The XRD patterns of these sample revealed that the required phase is present with a little amount of impurities.
What is the zeta potential of ZnO nanoparticle in buffer solution?
ZnO nanoparticle was suspended in buffer solution at PH 2,4,7,9 and 12 by addition of HCL and NaOH soln. There is –ve Zeta Potential b/w PH 5 TO 9