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The growth of ZnO nano-wire by a thermal evaporation method with very small amount of oxygen
박노국,한기보,이종대,류시옥,이태진,장원철,치헝창 한국물리학회 2006 Current Applied Physics Vol.6 No.1l
Formation of ZnO nano-wire by a thermal evaporation method was studied in this work. The ZnO nano-wire has grown from metal Zn granule under O2 environments at high temperature. We investigated the behavior of the ZnO nano-wire growth with the change ofoxygen content in carrier gas (N2). Zn granules were placed in an alumina boat. The boat was inserted in a horizontal tube furnace. Thefurnace temperature was maintained in the range of 7001000.C for 0.52 h. The oxygen contents were adjusted from 0.5 to 5 vol% byonly at 1.62.0 vol% O2 conditions. ZnO nano-wire did not grow when the oxygen content is either 0 vol% or higher than 2.5 vol%. Fromthese results, it was conrmed that oxygen content in the thermal evaporation method is an important factor for the synthesis of the ZnOnano-wire.
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The growth of the flower-like ZnO structure using a continuous flow microreactor
정지영,박노국,한기보,이태진,류시옥,한승열,치헝창 한국물리학회 2008 Current Applied Physics Vol.8 No.6
ZnO is a valuable material for display devices, for catalytic chemical reactors, and as sorbents for desulfurizaton because of its excellent chemical and thermal stability. In this work, we report the synthesis of flower-like ZnO structures using a continuous flow microreactor over an oxidized silicon substrate. A chemical solution that employed zinc acetate [Zn(CH₃COO)₂ㆍ 2H₂O] and sodium hydroxide [NaOH] was used as precursors. The effects of water bath temperature, impinging time and concentration of NaOH on the growth of the flower-like structure have been investigated in this study. It was confirmed that the size of the fabricated flower-like structure was increased as the impinging time and the water bath temperature were increased. Various flower-like morphologies were observed according to the different concentration of NaOH. Scanning electron microscope (SEM) was used to study the morphologies of the synthesized flower-like ZnO structures. X-ray diffraction (XRD) was used to characterize the crystal structures of the ZnO crystallites as a function of the concentration of sodium hydroxide.
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You Jin Lee,박노국,한기보,류시옥,이태진,치헝창 한국물리학회 2008 Current Applied Physics Vol.8 No.6
Zinc oxide (ZnO) nano-particles have been synthesized by a matrix-assisted method with various precursors. An activated carbon was used as a matrix and zinc acetate, zinc nitrate, and zinc chloride were selected as precursors. The ZnO nano-particles appeared to be either spherical or elliptical shapes when zinc acetate and zinc nitrate were used as precursors, while those particles became irregular in their shapes when zinc chloride was used as a precursor. The products were characterized by using TGA, XRD, BET, TEM and SEM. A nano-size ZnO was formulated for the effective removal of a very low concentration of sulfur compounds (H₂S, COS) contained in a gasified fuel gas and their reactivity was also investigated in this study. Zinc acetate was the best precursor for the formulation of the ZnO nano-particles in the experiment. The size of the formulated ZnO nano-particles was in the range of 10–30 nm and its surface area was about 40.7 m2/g. From TGA (thermal gravity analysis) test, it was found that its sulfur capacity was about 9.27 g S/100 g-sorbent for H2S and 0.56 g S/100 g-sorbent for COS and its initial sulfur absorption rates with H₂S and COS absorption were about 257.5 mg S/ min Æ 100 g-sorbent and 15.6 mg S/min Æ 100 g-sorbent, respectively. Their reactivity increased as their sizes became smaller and their surface areas of the sorbents were larger. Most prepared nano-size ZnO showed an excellent performance for the removal of not only H₂S but also COS.
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