• Proceedings of the Materials Research Society of Korea Conference
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• 2003.11a
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• pp.241-241
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• 2003

실리카 나노 분말의 제조공정과 얻어진 나노분말의 자기조립 현상에 대하여 연구하였다. 나노분말은 TEOS(Tetraethylorthosilicate)를 이용하여 Stober process로 단분산 콜로이드 SiO2를 제조하였다. 다양한 응용을 위해서 좁은 입도분포를 가지면서도 다양한 크기를 가지는 분말을 제조하고자 TEOS, NH4OH, 에탄올, 증류수 등의 절대량과 몰비를 변화시키면서 나노분말을 제조하였다. 실험조건에 대한 입도분포와 평균 입자크기의 변화는 핵생성 이론으로 설명될 수 있었다. 얻어진 나노분말을 이용하여 dipcoating과 electron plating방법으로 단층 혹은 여러층의 박막을 형성하였다. 자기배열에 기초한 두 가지 증착방법에서 박막층에 미치는 변수들의 영향을 주로 electorn plating 방법에 대하여 고찰하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.475-476
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• 2006

Self-assembled monolayers (SAMs) formed by the adsorption of alkanethiols, HS(CH2)nX, where X is an organic functional group, onto gold surfaces have attracted widespread interest as templates for the fabrication of molecular and biomolecular microstructures. Previously photopatterning has been thought of as being restricted to the micron scale, because of the well-known diffraction limit. So, we have explored a novel approach to nanofabrication by utilizing a femtosecond laser.

• Journal of the Korean Society for Precision Engineering
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• v.24 no.5
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• pp.104-109
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• 2007

Photochemical patterning of self-assembled mono layers (SAMs) has been performed by diode pumped solid state (DPSS) 3rd harmonic Nd:$YVO_4$ laser with wavelength of 355 nm. SAMs patternings of parallel lines have subsequently been used either to generate compositional chemical patterns or fabricate microstructures by a wet etching. This paper describes a selective etching process with patterned SAMs of alkanetiolate molecules on the surface of gold. SAMs formed by the adsorption of alkanethiols onto gold substrate employs as very thin photoresists. In this paper, the influence of the interaction between the functional group of SAMs and the etching solution is studied with optimal laser irradiation conditions. The results show that hydrophobic functional groups of SAMs are more effective for selective chemical etching than the hydrophilic ones.

• Journal of the Korean Vacuum Society
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• v.21 no.5
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• pp.233-241
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• 2012

We have deposited the bilayer consisted of the underlayer and the overlayer by using DC magnetron sputter on Single crystal MgO (001) substrate. This bilayer was fabricated at fixed annealing temperature and time. We have controlled agglomeration effect by changing of the bilayer thickness. Finally, we have made the self-organization and nano-structured film. In this processing, we have made nano-dot which consists of the underlayer and the overlayer, unlike the existing method called the agglomeration effect in the single layer. The underlayer has deposited using Ti, Cr and Co. And the overlayer has deposited with Ag. Through the analysis of Atomic force microscopy (AFM), the microstructure of underlayer is observed by AFM to confirm the formation of nano-dot. As the nano-dot through above processing, we have found that the nano-dot has the different shape. As a result, when we manufactured nano-dot through the agglomeration effect of bi-layer, the best matching material is Ti for underlayer. And also, we have found that MgO/Ti/Ag samples have been grown expitaxially toward the direction of MgO (001) by X-ray Diffraction analysis.