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Real-time Spectroscopic Methods for Analysis of Organic Compounds in Water
김치훈,지택수 한국광학회 2019 Current Optics and Photonics Vol.3 No.4
This paper proposes an optical system where the organic compound content in water is determined by using an ultraviolet (UV) LED (280 nm) and photodetector. The results obtained by the proposed prototype LED spectroscopy system, which includes a single photodetector and two parallel sample holders, are calculated by applying partial least square regression; the values are highly correlated with the actual concentrations of potassium hydrogen phthalate solutions, with an adjusted coefficient of determination about 0.996. Moreover, the total organic carbon values derived from the UV-Vis spectrometer of real samples (lake, river and sea water) differed little from those obtained by the LED spectroscopy. We confirm that the fast, sensitive, and compact LED sensor system can be readily configured for real-time monitoring of organic compounds in water.
윤대한,Vaibhav. C. Lokhande,지택수 대한전자공학회 2023 전자공학회논문지 Vol.60 No.5
This study examines the electrode material of a supercapacitor using a transition metal oxide as pseudo-capacitors. Precursors of tungsten (W), niobium (Nb), molybdenum (Mo) and iron(Fe) were mixed to synthesize them using hydrothermal synthesis method, and electrochemical properties were analyzed by depositing them on carbon cloth. In a 1M H2SO4 electrolyte, specific capacity was calculated by evaluating electrochemical characteristics through cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). In addition, properties of sample materials were analyzed through X-ray diffraction analysis (XRD) and X-ray spectroscopy (XPS), and through Field emission scanning electron microscope (FE-SEM) images. As a result of the analysis, Fe did not participate in the binding, and it was found that WO3, Nb2O5, and MoO3 accounted for 18.32%, 6.94%, and 74.74% respectively, through XRF analysis. The specific capacitance was calculated through GCD and it showed a good value 375A/g in 1A/g of current density. 본 논문에서는 유사커패시터 중에서 전이금속 산화물을 이용한 슈퍼커패시터의 전극 물질을 합성하고 전기화학적 분석을 통해 그 특성을 연구하였다. 텅스텐(W)과 나이오븀(Nb), 몰리브덴(Mo)과 철(Fe)의 전구체들을 혼합하여 수열합성법(Hydrothermal Synthesis)을 이용하여 합성하였고 탄소 섬유(Carbon cloth)에 증착시켜 전기화학적 특성을 분석하였다. 1M H2SO4 전해질에서 순환전압전류법(CV, Cyclic voltametry)과 정전류 충방전법(GCD, Galvanostatic charge-discharge)을 통하여 전기화학적 특성 평가를 하여 비축전량(Specific capacitance)을 계산하였으며, X-ray 회절분석(XRD), X-ray 분광분석(XPS) 및 전기주사현미경(FE-SEM) 이미지를 통하여 각 물질의 특성을 분석하였다. 분석결과 4가지 원소 중 Fe는 결합에 참여하지 않았다는 것을 알 수 있었고 X-ray 형광분석(XRF)을 통해, 합성된 시료물질은 WO3, Nb2O5, MoO3가 각각 18.32%, 6.94%, 74.74%를 차지하고 있다는 것을 알 수 있었다. GCD를 통해 계산한 비축전량은 1A/g에서 375A/g으로 양호한 값을 나타내었다.
Myung Sang Kim,지택수,Jeongwoo Hwang,신재철 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
Semiconductor nanotube structures have attracted much interest for building blocks of futurenanoscale electronic and optical devices. Here, we investigate the structural properties of straininducedself-rolled III-V semiconductor nanotubes. The III-V semiconductor structures for nanotubeformation were grown on InP substrates. The bilayer and the quantum-well structuresare grown using a metalorganic chemical-vapor deposition system and were fabricated into selfrollednanotubes. For the self-rolling process, ternary InxGa1−xAs layers were used to produce alattice-mismatch strain in the nanotube membrane. The experimental observations of the nanotubestructures are discussed.