• 전기화학회지
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• 제1권1호
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• pp.55-59
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• 1998

방식도막의 수명에 가장 큰 영향을 미치는 물의 흡수과정을 quartz crystal microbalance법 및 임피던스 원리를 이용하여 연구하였다. 도막에 있어서 물의 흡수량과 전해질 농도 변화에 따른 도막의 capacitance를 조사하였다 방식도막에 대한 물의 흡수는 삼투압 작용에 의해서 이루어지고, 흡수 초기단계에서는 도막두께가 얇을수록 흡수량이 많은 것을 알 수 있었다 그리고 도막을 구성하고 있는 수지의 종류 및 결합 가교밀도에 따라서 흡수성이 큰 영향을 받는다는 것을 알 수 있었다. 또한 방식도막에 있어서는 접촉하는 전해질 용액의 농도 변화에 따라 흡$\cdot$탈수 현상이 발생하였으며, 같은 종류의 도막이라도 도막두께가 얇을수록 탈수현상에 따른 capacitance의 증가폭이 큰 것으로 나타났다

• 전기화학회지
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• 제7권1호
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• pp.16-20
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• 2004

플러렌 이온$(full^-)$으로 수식된 피를 고분자 피막을 전기화학법으로 중합하기 위하여 사용된 전지는 Au/5mM pyrrole, 1mM fullerene, 0.1M $TBABF_4,\; CH_2C1_2/Pt$이었으며 이 전지로 $electrode/ppy(full^-)ppy(full^-){\ldots}$와 같은 웨이퍼형의 전극을 제작하였다. 이 전극을 사용한 Au(quartz crystal analyzer; QCA)/ppy$(full^-)$, 0.01M metal ion(aq.)/Pt형의 전지로 알카리 금속이온을 포집하였다. $Li^+,\;Na^+,\;K^+,\;Rb^+$ 및 $Cs^+$이온의 포집에 대한 속도상수는 일차반응 속도식으로 계산한 결과 그 값이 각각 $1.60\times10^{-8},\;3.13\times10^{-11},\;1.38\times10^{-9},\;2.71\times10^{-11}$ 및 $2.98\times10^{-12}mo1.s^{-1}$이였다. 이 전극을 수정판 미량저울(QCM)을 적용하여 결정한 각 이온의 화학양론은 $Li_7C_{60},\;Na_4C_{60},\;K_3C_{60},\;Rb_1C_{60}$ 및 $Cs_1C_{60}$이었다.

• Bulletin of the Korean Chemical Society
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• 제26권5호
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• pp.697-706
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• 2005

We review the evolution of electrochemical studies of conducting polymers into the current state-of-the-art based primarily on our work. While conventional electrochemical experiments sufficed for the needs in the phase of studies of both electrochemical synthesis and characterization of conducting polymers, developments of various new experimental techniques have led to their introduction to this field for more refined information. As a result, the conventional electrochemical, spectroelectrochemical, electrochemical quartz crystal microbalance, impedance, and morphological as well as electrical characterization studies all made important contributions to a better understanding of the polymerization mechanisms and the conductive properties of these classes of polymers. From this review, we hereby expect that the electrochemical techniques will continue to play important roles in bringing this field to the practical applications such as nanoscale electronic devices.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.103.1-103.1
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• 2015

위성체 개발에 있어서 지상에서 위성체의 부품에 대한 고온($85^{\circ}C$ 이상)과 고진공($5.0{\times}10-3Pa$ 이하)의 상태를 모사하여 오염물질을 제거하는 베이크아웃 시험이 필수적이다. 일반적으로 베이크아웃 시험의 종료여부는 TQCM (Thermoelectric Quartz Crystal Microbalance)을 이용한 탈기체(outgassing)의 흡착률을 측정하여 결정한다. 측정된 흡착률을 통해 시험 대상 표면에서 발생하는 탈기체량을 추정할 수 있으며, 결국 시험 대상의 우주 부품으로써의 적합성을 판단할 수 있다. TQCM을 적용하지 못하는 경우, 베이크아웃 시험 종료여부를 판단하기 위해 잔류가스분석기(Residual Gas Analyzer: RGA)를 활용하는 것을 고려하였다. 베이크아웃 시험 중 잔류가스분석기를 활용하여 시편에서 방출되는 오염물질을 측정하였으며, 그 중 측정량이 가장 많은 40-45 amu 범위의 측정값 추이를 관찰하여, 베이크아웃 시험 종료조건 수립 가능성을 검토하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 춘계학술대회 논문집 센서 박막재료 반도체재료 기술교육
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• pp.21-23
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• 2002

In this paper, the electrochemical behavior of Viologen self assembly monolayer has been investigated with QCM, which has been known as nano-gram order mass detector. The self assemvly process of Viologen was monitored using resonant frequency $({\Delta}F)$ and resonant resistance(R). QCM measurements indicated a mass adsorption for Viologen assembling on the gold sufrace with a frequency change about 135[Hz] and calculated its surface coverage($\Gamma$) to be $3.5273{\times}10^{-9}[mol/cm^{2}]$. Also reversible redox process was observed and analyzed with ionic interaction at the Viologen/solution interface using ${\Delta}F$.

• E2M - 전기 전자와 첨단 소재
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• 제10권5호
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• pp.419-424
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• 1997

It is well known that the metallo-phthalocyanines (MPcs) are sensitive to toxic gaseous molecules such as NO$_2$ as well as are chemically and thermally stable. Therefore, lots of MPcs have been studied as the potential chemical sensor for NO$_2$gas using quartz crystal microbalance(QCM) or electrical conductivity. In this study, thin films of octa(2-ethylhexyloxy)copper-phthalocyanine were prepared by Langmuir-Blodgett method and characterized by using UV-VIS absorption spectroscopy and ellipsometry. Optimal transfer condition of LB films was investigated and preliminary results of current-voltage(I-V) characteristics of these films exposed to NO$_2$gas as a function of film thickness, temperature and concentration were discussed.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.434-435
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• 2008

An in-situ monitoring technique for deposition process of CdS buffer layer was developed in this work. A quartz crystal microbalance (QCM) was used to measure the frequency change during the CdS deposition process and the relation ship between frequency change and film thickness and optical transmittance was investigated. The film thickness shows a linear relationship with frequency change, demonstrating that frequency change measured by QCM can be used a in-situ monitoring tool for CdS deposition process.

• Applied Science and Convergence Technology
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• 제24권1호
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• pp.1-8
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• 2015

Protein immobilization on a gold surface plays an important role in the usefulness of biosensors that utilize gold-coated surfaces such as surface plasmon resonance (SPR), quartz crystal microbalance (QCM), etc. For developing high performance biosensors, it is necessarily required that immobilized proteins must remain biologically active. Loss of protein activity and maintenance of its stability on transducer surfaces is directly associated with the choice of immobilization methods, affecting protein-protein interactions. During the past decade, a variety of strategies have been extensively developed for the effective immobilization of proteins in terms of the orientation, density, and stability of immobilized proteins on analytical devices operating on different principles. In this review, recent advances and novel strategies in protein immobilization technologies developed for biosensors are briefly discussed, thereby providing an useful information for the selection of appropriate immobilization approach.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1993년도 추계학술대회 논문집
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• pp.109-111
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• 1993

We reported the fabrication and thermal cross-linking of the LB files on porous substrates. The monolayers of the polymers which polyion-conplexed with PAA at the air-water interface can be transferred onto solid substrates such as porous fluorocarbon membrane filter and quartz crystal microbalance. The properties of the monolayers and the LB films investigated by $\pi$-A isothem, FT-IR, and SEM will be discussed. In addition, it was attempted to investigate the reaction of polymer LB films in the organic gas surrounding by the use of LB technique.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 추계학술대회 논문집
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• pp.273-276
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• 1995

In this paper, the response characteristics of organic gases were investigated by using quartz crystal microbalance(Q.C.M) with different coating materials. The method for pattern was discussed in order to develope gas sensing system using neural network and pattern recognition. we analyzed the response characteristics by the area of frequency shift, which mean affinities of gases for coating material. The results shows that the Parameter made by the area of frequency shift has possibility to be used for pattern recognition and neural network. we found that each gas had different decrease pattern for coating material.