화학공학소재연구정보센터
Applied Chemistry for Engineering, Vol.24, No.5, 443-455, October, 2013
마이크로-액체/액체 계면에서의 이온 이동 반응을 이용한 전기화학 센서 개발
Creating Electrochemical Sensors Utilizing Ion Transfer Reactions Across Micro-liquid/liquid Interfaces
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초록
혼합되지 않는 두 용액 사이의 계면(interface between two immiscible electrolyte solutions, ITIES)에서의 전하 이동 반응에 대한 전기화학적 연구는 이온 검출용 센서, 바이오센서, 생체막 모델링, 약물 전달 반응, 상전이 촉매반응, 연료 생성, 태양에너지 전환 등을 포함한 다양한 연구 분야에 적용이 가능하기 때문에 크게 주목받고 있다. 특히 ITIES에서의 이온 전이 반응을 이용하여 이온물질 및 생물질 등을 검출할 수 있는 센서로 개발하기 위해 불안정한 ITIES의 한 쪽 액체층을 젤(gel)화하여 안정화하고, 마이크로 계면 형성을 통해 전압강하를 최소화 시키는 등의 연구가 활발하게 이루어졌다. 본 총설에서는 ITIES 계면에서의 이온 전이 반응을 이용하여 개발된 다양한 센서의 원리와 응용 및 발전 가능성에 대해 다루고자 한다. ITIES 계면을 (i) 보편적인 액체/액체 계면형, (ii) 마이크로피펫 팁형, (iii) 고분자 박막에 형성된 단일 마이크로홀 또는 마이크로홀 어래이형 및 (iv) 실리콘 기판에 제작된 마이크로홀 어래이형으로 분류하고, 이들 계면에서의 직접적인 이온 전이 반응과 보조 이온 전이 반응을 활용하여 수질 환경 오염의 원인이 되는 이온 및 농약 성분을 선택적으로 검출할 수 있는 이온 선택성 센서와 생물질을 분석할 수 있는 바이오센서 개발 연구에 대해 초점을 두고 소개하려 한다.
Electrochemical studies on charge transfer reactions across the interface between two immiscible electrolyte solutions (ITIES) have greatly attracted researcher’s attentions due to their wide applicability in research fields such as ion sensing and biosensing, modeling of biomembranes, pharmacokinetics, phase-transfer catalysis, fuel generation and solar energy conversion. In particular, there have been extensive efforts made on developing sensing platforms for ionic species and biomolecules via gelifying one of the liquid phases to improve mechanical stability in addition to creating microscale interfaces to reduce ohmic loss. In this review, we will mainly discuss on the basic principles, applications and future aspects of various sensing platforms utilizing ion transfer reactions across the ITIES. The ITIES is classified into four types : (i) a conventional liquid/liquid interface, (ii) a micropipette supported liquid/liquid interface, (iii) a single microhole or an array of microholes supported liquid/liquid interface on a thin polymer film, and (iv) a microhole array liquid/liquid interface on a silicon membrane. Research efforts on developing ion selective sensors for water pollutants as well as biomolecule sensors will be highlighted based on the use of direct and assisted ion transfer reactions across these different ITIES configurations.
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