- Applications of Nanomanipulator in Nanowires
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Sang-Won Yoon, Jong-Hyun Seo, Jae-Pyoung Ahn, Tae-Yeon Seong, Kon-Bae Lee
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J Korean Powder Metall Inst. 2009;16(2):138-145.
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DOI: https://doi.org/10.4150/KPMI.2009.16.2.138
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- The combination of focused ion beam (FIB) and 4 point probe nanomanipulator could make various nano manufacturing and electrical measurements possible. In this study, we manufactured individual ZnO nanowire devices and measured those electrical properties. In addition, tensile experiments of metallic Au and Pd nanowires was performed by the same directional alignment of two nanomanipulators and a nanowire. It was confirmed from I-V curves that Ohmic contact is formed between electrodes and nanomanipulators, which is able to directly measure the electrical properties of a nanowire itself. In the mechanical tensile test, Au and Pd nanowires showed a totally different fracture behavior except the realignment from <110> to <002>. The deformation until the fracture was governed by twin for Au and by slip for Pd nanowires, respectively. The crystallographic relationship and fracture mechanism was discussed by TEM observations.
- Principle and Applications of EELS Spectroscopy in Material Characterizations
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Sang-Won Yoon, Kyou-Hyun Kim, Jae-Pyoung Ahn, Jong-Ku Park
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J Korean Powder Metall Inst. 2007;14(3):157-164.
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DOI: https://doi.org/10.4150/KPMI.2007.14.3.157
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- An electron energy loss spectroscopy (EELS) instrument attached on transmission electron microscopy (TEM) becomes a powerful and analytical tool for extracting the noble information of materials using the enhancement of TEM images, elemental analysis, elemental or chemical mapping images, electron energy loss near edge structure (ELNES), and extended energy-loss fine structure (EXELFS). In this review, the principle and applications of EELS which is widely used in material, life, and electronic sciences were introduced.
- Synthesis of W18O49 Phase by Carbothermal Reduction of Tungsten Oxide and its Field Emission Characteristics
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Hyo-Seung Yang, Hoon Park, Hyoung-chul Kim, Jae-Pyoung Ahn, Moo-Young Huh, Jong-Ku Park
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J Korean Powder Metall Inst. 2004;11(3):253-258.
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DOI: https://doi.org/10.4150/KPMI.2004.11.3.253
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Abstract
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- We report a carbothermal reduction process for massive synthesis of monolithic W_18O_49 phase from tungsten oxide in the presence of carbon source. Carbon black powder was used as a carbon source and added to WO_3 by 40 weight percent. Bundles of W_18O_49 rods were formed over the temperature range of 800°C°C to 900°C. Pure W_18O_49 bundles could be separated from the mixture of W_18O_49 and residual carbon black powder. Field emission character of W_18O_49 phase was determined using the extracted W_18O_49 rods. Flat lamp fabricated from the W_18O_49 rods showed the turn-on field of 9.3 V/µm.
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