• Title/Summary/Keyword: Electrochemiluminescence

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The characterized electrochemiluminescence in microsystem with photodiode (광 검출용 마이크로시스템을 이용한 ECL 특성)

  • Pyo, Seong-Yeol;Kang, Moon-Sik;Yoo, Kum-Pyo;Hong, Suk-In;Min, Nam-Ki
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1941-1943
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    • 2003
  • 본 논문은 광 검출을 이용한 전기화학발광 (Electrochemiluminescence : ECL)을 마이크로시스템에 적용하여 소형화하였으며, 기존 광 검출 시스템과 결과를 비교하여 그 특성을 분석하였다. ECL은 전기에너지를 촉매로 사용하기 때문에 화학발광 보다 마이크로채널 내에서 발생하는 층류문제를 해결할 수 있는 적합한 방법이다. 유리기판에 Au를 박막으로 증착하여 전극으로 사용하였으며, SU-8 구조물을 이용한 PDMS mold를 사용하여 마이크로채널을 제작하였다. 전극과 PDMS는 $O_2$ 플라즈마를 이용하여 접합하였다. luminol과 과산화수소는 Syringe pump로 구동하였으며, 발생된 빛은 반도체 공정기술로 제작한 P-N접합 포토다이오드를 이용하여 전류신호로 측정하였다. 새로 구성된 시스템을 이용하여 마이크로채널 내에서의 luminol과 과산화수소의 유속, 농도변화에 따른 광전류 변화를 측정하여 기존시스템과 비교하였다.

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Fabrication of High-Efficiency Electrochemiluminescence Cell with Nanocrystalline TiO2 Electrode (나노입자 이산화티타늄 전극 기반의 고효율 전기화학형 발광 셀 제작)

  • Kwon, Hyuk-Moon;Han, Chi-Hwan;Sung, Youl-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.2
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    • pp.363-368
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    • 2010
  • In this work, electrochemiluminescence (ECL) cell using nanocrysralline $TiO_2$ electrode and Ru(II) complex (Ru${(bpy)_3}^{2+}$) is fabricated for low-cost high-efficient energy conversion device application. The nanocrysrallme $TiO_2$ layer (${\sim}10{\mu}m$ thickness) with large surface area (${\sim}360m^2$/g) can largely inject electrons from nanoporous $TiO_2$ electrode and allows the oxidation/reduction of Ru(II) complex in the nanopores. The cell structure is composed of a glass/ F-doped $SnO_2$(FTO)/ porous $TiO_2$/ Ru(II) complex in acetonitrile/ FTO/ glass. The nanocrysralline $TiO_2$ layer is prepared using sol-gel combustion method. The ECL efficiency of the cell consisting of the porous $TiO_2$ layers was 250 cd/W, which was higher than that consisting of only FTO electrode (50cd/W). The nanoporous $TiO_2$ layers wwas effective for increasine ECL intensities.

Carbon Particle-Doped Polymer Layers on Metals as Chemically and Mechanically Resistant Composite Electrodes for Hot Electron Electrochemistry

  • Habiba, Nur-E;Uddin, Rokon;Salminen, Kalle;Sariola, Veikko;Kulmala, Sakari
    • Journal of Electrochemical Science and Technology
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    • v.13 no.1
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    • pp.100-111
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    • 2022
  • This paper presents a simple and inexpensive method to fabricate chemically and mechanically resistant hot electron-emitting composite electrodes on reusable substrates. In this study, the hot electron emitting composite electrodes were manufactured by doping a polymer, nylon 6,6, with few different brands of carbon particles (graphite, carbon black) and by coating metal substrates with the aforementioned composite ink layers with different carbon-polymer mass fractions. The optimal mass fractions in these composite layers allowed to fabricate composite electrodes that can inject hot electrons into aqueous electrolyte solutions and clearly generate hot electron- induced electrochemiluminescence (HECL). An aromatic terbium (III) chelate was used as a probe that is known not to be excited on the basis of traditional electrochemistry but to be efficiently electrically excited in the presence of hydrated electrons and during injection of hot electrons into aqueous solution. Thus, the presence of hot, pre-hydrated or hydrated electrons at the close vicinity of the composite electrode surface were monitored by HECL. The study shows that the extreme pH conditions could not damage the present composite electrodes. These low-cost, simplified and robust composite electrodes thus demonstrate that they can be used in HECL bioaffinity assays and other applications of hot electron electrochemistry.

A Review on Paper-based Electrochemical Sensors (종이 기반 전기화학 센서의 연구 동향)

  • Minjee Seo
    • Journal of the Korean Electrochemical Society
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    • v.27 no.1
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    • pp.1-7
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    • 2024
  • With the increasing demand for wearable sensors that are capable of point-of-care testing, paper-based sensors have been extensively studied. Paper is not only extremely cost-effective but also lightweight and flexible, and it is easy to apply conductive materials such as carbon and hydrophobic substances like wax to its surface. Moreover, the capillary action caused by cellulose fibers in paper allows the flow of liquid without help from external forces, making paper a particularly promising platform for wearable electrochemical sensors. Accordingly, paper-based sensors for detecting various analytes through electrochemical methods have been actively developed. Recently, paper-based electrochemical sensors that utilize electrochemiluminescence (ECL) or electrochromic materials for the optical read-out have been reported. This review introduces the basic fabrication methods and various application strategies of paper-based electrochemical sensors.

Electrochemiluminescence-based detection system of glucose on SAM-coated electrode (SAM 코팅된 전극에서 ECL을 이용한 glucose 검출 시스템)

  • Yoo, Kum-Pyo;Kim, Yun-Ho;Kang, Moon-Sik;Hong, Suk-In;Min, Nam-Ki
    • Proceedings of the KIEE Conference
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    • 2004.07c
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    • pp.2121-2124
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    • 2004
  • 전기화학발광(ECL) 시스템은 높은 감도와 넓은 선형동작영역을 가지므로 분석화학에서 넓게 연구 되고 있다. 그러나 포토멀티플러, 광섬유와 플루오르메터로 구성된 ECL 검출 시스템은 크기가 크고, 전력소모가 많으며, 고가인 단점이 있다. 따라서 이러한 단점을 보완하기 위해 p+n 포토다이오드를 이용한 마이크로 ECL시스템을 제작 과산화수소 농도를 50uM${\sim}$10mM 범위에서 측정하였고, 글루코오스는 1mM${\sim}$20mM 농도범위에서 측정하였다. 따라서 마이크로 ECL 시스템이 바이오센서 혹은 바이오 분석기로써의 가능성을 확인 하였다.

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ECL properties for concentration of $H_2O_2$ and feature of electrodes (과산화수소 농도와 전극에 따른 전기화학발광 특성)

  • Pyo, Seong-Yeol;Kang, Moon-Sik;Kang, Chul-Goo;Kim, Hyung-Il;Hong, Suk-In;Min, Nam-Ki
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1566-1568
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    • 2002
  • 본 논문은 혈당, 콜레스테롤센서에 적용이 가능한 과산화수소($H_2O_2$) 검출방식인 전기화학발광(Electrochemiluminescence:ECL)법 사용에 필요한 전극특성에 관한 연구이다. 전기화학전극으로 Pt박막전극을 사용하였으며, luminol(5-amino-2, 3-dihydro-1, 4-phthala edione)과 과산화수소($H_2O_2$)의 반응으로 발생한 빛을 포토다이오드(photodiode)를 사용하여 전류를 측정하였다. 사용된 전극은 직사각형(rectangular-type), 교차형(interdigitated-type)의 두 가지 형태를 사용하여, 전극간의 거리와 면적에 따른 ECL특성을 측정하였다. ECL 발광 특성은 전극 면적이 증가함에 따라, 전극거리가 감소함에 따라 증가함을 관찰할 수 있었다.

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