• Proceedings of the Materials Research Society of Korea Conference
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• 2009.05a
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• pp.47.1-47.1
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• 2009

Nanostructured biomaterials have increased those potential for utilizing in many medical applications. In this study, benefit of nanotechnology for the response with biological targets will be described in terms of size, effective surface area and surface energy (physical aspect). Also, correlations between physical and biological interactions (greater protein adsorption on nano surface roughness) will be discussed for understanding biocompatibility of nanostructured biomaterials including carbon nanotube composites and nanostructured titanium surfaces. In the application parts, various major tissue cells, such as bone, cartilage, vascular and bladder cell responses will be discussed with suggested nanomaterials. Lastly, immune responses with macrophage (adhesion and several major cytokines) on nanostructured biomaterials will be described for evasive immune response.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.97-98
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• 2012

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1119-1121
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• 2006

Using a chemical radical we modified the surface property of PET substrates. The chemically treated substrate surface improved dispersion of CNTs on substrate and provides suitable adhesion of CNTs to substrate. In addition, an ink-jet printed patterning technique effectively improved the transparency of transparent conductive CNT composite films.

• Proceedings of the Korean Vacuum Society Conference
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• 2007.02a
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• pp.84-84
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• 2007

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.697-700
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• 2002

Porous anodic aluminum oxide(AAO) templates prepared by anodizing method were used for growing multiwalled carbon nanotubes(CNTs). AAO templates with the homogeneous pore diameter and length were obtained by two step anodizing technique. Using AAO templates, vertically well-ordered two-dimensional carbon nanotube arrays were fabricated. We investigated the field emission property of CNTs grown using different catalyst metals in vacuum chamber (<$10^{-7}$ Torr) on AAO Template. To explain the different emission property, the surface reaction between catalysts and alumina pores which inserted carbon species of $C_2H_2$ using High resolution transmission electron microscopy (HRTEM) was studied.

• Proceedings of the Korean Vacuum Society Conference
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• 2006.02a
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• pp.90-90
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• 2006

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.411-411
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• 2012

Over the recent years, surface enhanced Raman spectroscopy (SERS) has dramatically grown as a label-free detecting technique with the high level of selectivity and sensitivity. Conventional SERS-active nanostructured layers have been deposited or patterned on rigid substrates such as silicon wafers and glass slides. Such devices fabricated on a flexible platform may offer additional functionalities and potential applications. For example, flexible SERS-active substrates can be integrated into microfluidic diagnostic devices with round-shaped micro-channel, which has large surface area compared to the area of flat SERS-active substrates so that we may anticipate high sensitivity in a conformable device form. We demonstrate fabrication of flexible SERS-active nanostructured substrates based on soft-lithography for simple, low-cost processing. The SERS-active nanostructured substrates are fabricated using conventional Si fabrication process and inkjet printing methods. A Si mold is patterned by photolithography with an average height of 700 nm and an average pitch of 200 nm. Polydimethylsiloxane (PDMS), a mixture of Sylgard 184 elastomer and curing agnet (wt/wt = 10:1), is poured onto the mold that is coated with trichlorosilane for separating the PDMS easily from the mold. Then, the nano-pattern is transferred to the thin PDMS substrates. The soft lithographic methods enable the SERS-active nanostructured substrates to be repeatedly replicated. Silver layer is physically deposited on the PDMS. Then, gold nanoparticle (AuNP) inks are applied on the nanostructured PDMS using inkjet printer (Dimatix DMP 2831) to deposit AuNPs on the substrates. The characteristics of SERS-active substrates are measured; topology is provided by atomic force microscope (AFM, Park Systems XE-100) and Raman spectra are collected by Raman spectroscopy (Horiba LabRAM ARAMIS Spectrometer). We anticipate that the results may open up various possibilities of applying flexible platform to highly sensitive Raman detection.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.666-669
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• 2002

Vertically aligned carbon nanotubes (CNTs) have been produced using various type of plasma enhanced chemical vapor deposition (PECVD). Catalysts such as Ni, Co, and Fe are used for growth of CNTs. To explain the effect of catalysts on the growth characteristics of CNTs, carbon species of $C_2H_2$ was observed in different catalysts using optical emission spectroscopy (OES) with theoretical calculation on the surface reaction in different catalysts.

• Proceedings of the Korean Vacuum Society Conference
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• 2005.08a
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• pp.52-52
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• 2005

• Journal of the Korean Electrochemical Society
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• v.18 no.3
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• pp.107-114
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• 2015

Electrochemical fabrication of nanostructured Au surfaces has received increased attention. In the present work, electrochemical modification of Au surfaces for fabricating nanostructured Au surfaces in the absence of externally added precursors is presented, which is different to the previous methods utilizing electrochemical deposition of externally added precursors. Application of anodic potential at Au surfaces in phosphate buffers containing $Br^-$ resulted in the anodic dissolution of Au, which produced Au precursors at the electrode surfaces. The resulting Au precursors were further reduced at the surface to produce nanostructured Au structures. The effects of applied potential and time on the morphology of Au nanostructures were systematically examined, from which a unique backbone type Au nanostructures was produced. The backbone type Au nanostructures exhibited high surface-enhanced Raman activity. The present work would give insights into the formation of electrochemical fabrication of nanostructured Au surfaces.