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임현의(Hyuneui Lim),노정현(Junghyun Noh),김재윤(Jae-Yun Kim),김완두(Wan-Doo Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Metallization and metal nanostructures on semiconductors play a key role in the production process of MEMS/NEMS and arrayed nanosensors. We demonstrate a novel gold nanoparticle deposition as a result of the immersion of semiconductor substrates into dilute aqueous solution of AuCl⁴?. Deposition proceeded via galvanic displacement in the absence of pH adjusters and external reducing agents. The deposition rate, surface morphology and nanoparticle shape depend on the plating parameters as well as underlying semiconductor substrate. Deposited gold nanoparticles exhibit excellent adhesion to GaAs and InSb surfaces but not to InP and Si, independent of the plating time. This manner of deposition serves as a cost-effective, high-throughput method with potential applications such as high resolution patterning, interconnects, and metallization of MEMS/NEMS and nanodevice.
임현의(Hyuneui Lim),최경린(Kyung-Rin Choi),김완두(Wan-Doo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Superhydrophobic surfaces are the typical biomimetic structures having the useful applications in several key technological areas. In this paper, we report a simple method for creating super-water-repellent surface using a combination of colloidal lithography and plasma etching. The nanostructured surface was formed by plasma etching with colloidal bead mask. The well-ordered nanostructure was coated with the fluoroalkylsilane self-assembled monolayers to get the chemical layers of low surface energy. For water contact angle, the nanostructured surface was showed about 150°. For hexadecane water contact angle, the nanostructuring yields contact angle higher than 100°.
임현의(Hyuneui Lim),이지혜(Jihye Lee),노정현(Junghyun Noh),김완두(Wan-Doo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recent advances in nanosensors based on nanowires and nanotubes have revolutionized sensing technology to provide label-free, rapid, sensitive, and selective detection of a wide range of chemical and biological species. Especially, conducting polymers are promising materials for future applications in fields such as electronics and sensing because of their electrical properties, mechanical flexibility, relative ease of processing and funtionalization. In this paper, we demonstrate the polypyrrole nanowire sensor grown electrochemically, using microfabricated nanochannels. The effects of various parameters on nanowire growth were investigated systematically. This manner of sensor serves as a individually addressable nanowire sensor arrays with controlled dimensions, positions and chemical compositions for chemical and biomolecule detection.