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전기화학을 이용한 실리콘 표면상으로 기능성 물질의 공간 선택적 고정화 연구
박수현,아칠성,김규원,Park, Soo-Hyoun,Ah, Chil-Seong,Kim, Kyu-Won 한국전기화학회 2009 한국전기화학회지 Vol.12 No.1
실리콘 표면을 전기화학적으로 활성화하여 활성화된 표면에만 선택적으로 단백질이나 나노입자 등의 기능성 물질을 고정화하는 방법을 개발하였다. 이를 위해 Carboxymethylbenzendiazonium (CMBD) 양이온을 전기화학적 환원반응을 통해 고정하여 실리콘 표면을 활성화하는 방식을 선택하였다. 그리고 활성화 된 표면에서만 기능성 물질이 고정된 것을 확인함을 통하여 CMBD 양이온의 사용이 선택적 고정화에 매우 효과적임을 보였다. 나아가 이 방법을 응용하여 실리콘 나노소자에 탑재된 실리콘 나노선 어레이 중 선택된 나노선의 표면만을 활성화하고 금 나노입자를 선택적으로 고정하는 연구를 수행하였다. We present a method for spatially selective immobilization of functional materials, such as proteins and nanoparticles, onto pre-activated silicon surfaces by electrochemical reaction. Carboxymethylbenzendiazonium (CMBD) cations, being adsorbable on silicon surfaces through electrochemically reductive deposition, is used as an anchor molecule to prepare the pre-activated silicon surfaces. It is demonstrated that the use of BD reaction is very efficient for the selective immobilization because the functional materials are immobilized exclusively onto the pre-adsorbed CMBD region. The method is applied to immobilize gold nanoparticles on the selected nanowire of the nanowire array.
하동한(Dong Han HA),윤용주(Yong Ju Yun),아칠성(Chil Seong Ah),김상훈(Sanghun Kim),윤완수(Wan Soo Yun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
We show that it is possible to fabricate arbitrarily designed freestanding nano-objects; for example, Au nanogears with overall dimension below 500 ㎚, and to manipulate them so precisely as to assemble them by teeth to teeth without damaging them at all. Nanogears are fabricated by selective etching of single-crystalline Au template nanoplates using the Ga? focused ion beam (FIB). Although nanoparticles with diameters of around 20 ㎚ are easily moved by sharp atomic force microscopy (AFM) tips, blunt tips are needed to manipulate the nanogears. The capability of precise AFM manipulation for the various kinds of nano-objects, combined with the fabrication technique of arbitrarily designed freestanding nano-objects will be a useful tool for the development or repair of sophisticated micro/nano-structures.
하동한(Dong Han HA),윤용주(Yong Ju Yun),아칠성(Chil Seong Ah),윤완수(Wan Soo Yun),이광철(Kwang Cheol Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We suggest an approach to the fabrication of nano-sized components designed deliberately by selective Ga+ focused ion beam etching or Ar+ ion milling of Au nanoplates synthesized by the chemical reaction. The nanocomponents have various shapes like gear, letter 'A' etc. with in-plane size less than 500 ㎚ and thickness of 20~50 ㎚. They can be or moved freely one by one to be assembled into sophisticated nanodevices or micromachines. The applicability of our approach to the applied research is discussed.