One-D nano zinc oxide and vacuum electric arc prepn. process
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A nano-zinc oxide, vacuum arc technology, applied in nano-structure manufacturing, chemical instruments and methods, zinc oxide/zinc hydroxide, etc. Low energy and high efficiency
Inactive Publication Date: 2006-09-20
SOUTHEAST UNIV
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Embodiment 1
[0024] A kind of one-dimensional nano-zinc oxide, it is characterized in that this one-dimensional nano-zinc oxide is the white powder that the mixture of ZnO or Zn powder and powdery catalyst produces after discharging, and above-mentioned powdery catalyst is Fe, Co, Ni, Sn, Mg , Mn, Cu, Cr, Ti, Au, Ag or one or a mixture of two or more of their oxides. From image 3 It can be found in the scanning electron microscope photo of the white powder: there are many one-dimensional ZnO nanorods. The thinnest diameter is only about 5nm, which is close to the Bohr radius of zinc oxide, the thickest one is about 100nm, and the aspect ratio is more than 5. Figure 5 The diameter distribution diagram obtained after counting about 300 nanorods shows that most of the nanorods have a diameter of 10-25 nm.
Embodiment 2
[0026] A vacuum arc preparation method for preparing the one-dimensional nano-zinc oxide described in Example 1, using a graphite block or a metal block as a discharge cathode; in a graphite rod as a discharge anode, a cavity is opened, and the mixed ZnO or Fill the cavity of the graphite rod with Zn powder and powdery catalyst, the catalyst is one or two of Fe, Co, Ni, Sn, Mg, Mn, Cu, Cr, Ti, Au, Ag or their oxides The above mixture and the number of atoms of the powder catalyst is less than 30% of the total number of ZnO and powder catalyst atoms, for example: 30%, 200%, 15%, 3%, 0.3%, one of which can be selected in this embodiment Metal or a kind of metal oxide, such as: select Fe, Co, Ni, Sn, Mg, Mn or Cu, iron oxide, magnesium oxide, zinc oxide or copper oxide; Present embodiment also can select two or more above-mentioned metals or its Mixture of oxides, such as: mixture of Fe and Co, mixture of Ni, Sn and Mg, mixture of Mg, Mn and Cu, mixture of Fe, Co, Ni, Sn, Mg, Mn ...
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Abstract
This invention relates to a method to prepare one-dimension nanosized zincum oxide. The one-dimension nanosized zincum oxide is a kind of white powder which is generated from the mixture of zincum oxide or zincum powder and catalyst powder after discharge. The catalyst is combined from one or over two species of iron, cobalt, nickel, tin, magnesium, manganese, copper, chromium, titanium, gold, silver or their oxides. The preparation method is that, a graphite block or metal block is taken as discharge cathode. A cavity is set in a graphite bar as discharge anode, and the mixed zincum oxide or zincum powder and catalyst are filled into the cavity set in the graphite bar. The preceding discharge anode and cathode are placed into a discharge cavity and discharge is carried out in a 300Torr~1atm mixed-air environment with a discharge current of 50~130A. After discharge, the white powder deposited on the inner wall of the discharge cavity is zincum oixde crystal whiskers. The preceding mixed air is the mixture of inert gas and oxygen, with an oxygen volume fraction of 10~50%.
Description
technical field [0001] The invention relates to a zinc oxide and a preparation method thereof, in particular to a one-dimensional nanometer zinc oxide and a vacuum arc preparation method thereof. Background technique [0002] Nanomaterials refer to the system composed of substances with a size between 0.1-100nm, and the particle size ranges from several to hundreds of atoms. In this scale, materials exhibit many effects different from bulk materials, such as quantum Size effect, small size effect, surface effect, quantum tunneling effect and dielectric confinement effect, etc. Zinc oxide is a wide bandgap semiconductor material with good photoelectric and photoacoustic effects. It can be used as the basic material of short-wavelength light-emitting devices and field emission devices, and can be used as transparent windows of solar cells and gas sensors. One-dimensional nano-zinc oxide has potential application as short-wavelength nano-laser. [0003] At present, the method...
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