• Title/Summary/Keyword: Copper-based electrodes

Search Result 48, Processing Time 0.026 seconds

A study on the characteristics of EDM with the electrode materials (전극 소재에 따른 방전가공 특성에 관한 연구)

  • Jung T.S.;Lee S.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2006.05a
    • /
    • pp.569-570
    • /
    • 2006
  • In this study, the characteristics of Electrical Discharge Machining (EDM) with the electrode materials were investigated. EDM experiments have been carried out on electrodes with eight different copper-based and graphite-based materials. From the results, the copper-based electrodes showed excellent surface roughness than the graphite-based electrodes. But graphite based electrodes have advantages in economic aspects.

  • PDF

Development of Flexible Glucose Measurement Sensor Based on Copper Nanocubes Electroplated Laser Induced Graphene Electrode (구리 나노 큐브를 전기 도금한 레이저 유도 그래핀 전극 기반의 글루코스 측정용 유연 센서 개발)

  • Kim, Geon-Jong;Kim, Taeheon;Pak, Jungho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.3
    • /
    • pp.413-418
    • /
    • 2018
  • In this paper, we describe the development of a non-enzymatic glucose sensor based on copper nanocubes(Cu NCs) electroplated laser induced graphene(LIG) electrodes which can detect a certain range of glucose concentrations. $CO_2$ laser equipment was used to form LIG electrodes on the PI film. This fabrication method allows easy control of the LIG electrode size and shape. The Cu NCs were electrochemically deposited on the LIG electrodes to improve electron transfer rates and thus enhancing electrocatalytic reaction with glucose. The average sheet resistances before and after electroplating were $15.6{\Omega}/{\Box}$ and $19.6{\Omega}/{\Box}$, respectively, which confirmed that copper nanocubes were formed on the laser induced graphene electrodes. The prepared electrode was used to measure the current according to glucose concentration using an electrochemical method. The LIG electrodes with Cu NCs demonstrated a high degree of sensitivity ($1643.31{\mu}A/mM{\cdot}cm^2$), good stability with a linear response to glucose ranging from 0.05 mM to 1 mM concentration, and a limit of detection of 0.05 mM. In order to verify that these electrodes can be used as flexible devices, the electrodes were bent to $30^{\circ}$, $90^{\circ}$, and $180^{\circ}$ and cyclic voltammetry measurements were taken while the electrodes were bent. The measured data showed that the peak voltage was almost constant at 0.42 V and the signal was stable even in the flexed condition. Therefore, it is concluded that these electrodes can be used in flexible sensors for detecting glucose in the physiological sample like saliva, tear or sweat.

Layered Nickel-Based Oxides on Partially Oxidized Metallic Copper Foils for Lithium Ion Batteries

  • Chung, Young-Hoon;Park, Sun-Ha;Kim, Hyun-Sik;Sung, Yung-Eun
    • Journal of Electrochemical Science and Technology
    • /
    • v.2 no.4
    • /
    • pp.204-210
    • /
    • 2011
  • Thin film electrodes have been intensively studied for active materials and current collectors to enhance the electrochemical performance. Here, porous structures of nickel-based oxide films, consisting of nickel oxide and copper (II) oxide, which was derived from the copper substrate during the annealing process, were deposited on metallic copper foils. The half-cell tests revealed excellent capacity retention after $80^{th}$ charge/discharge cycles. Some films showed an excess of the theoretical capacity of nickel oxides, which mainly originate from partially oxidized copper substrates during annealing. These results exhibit that both a preparation method of an active materials and partially oxidized current collectors could be important roles to apply thin film electrodes.

Development of a Non-contacting Capacitive Sensor Based on Thompson-Lampard Theorem for Measurement of ${\mu}m-order$ Displacements (Thompson-Lampard 정리를 적용한 마이크로미터 변위 측정을 위한 비접촉식 전기용량 센서 개발)

  • Kim, Han-Jun;Kang, Jeon-Hong;Han, Sang-Ok
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.55 no.9
    • /
    • pp.443-448
    • /
    • 2006
  • Non-contacting capacitive sensor based on Thompson-Lampard theorem have been fabricated and characterized for measuring of 때 order displacements. To overcome disadvantages of the existed capacitive sensors of parallel plate type with 2-electrodes and 3-electrodes, the developed new sensor was designed to have 4-electrodes with a constant gap of 0.2mm between the electrodes. Two of the electrodes were used as a high potential electrode and a low one, the other two electrodes were used as guard electrodes. These electrodes were made from copper using RF sputtering system on a sapphire plate with diameter 17 mm and thickness 0.7 mm. This sensor can be used for measuring the distance not only between the sensor and metallic target connected to ground potential but also non-metallic target without ground connection.

Characteristics of dry-process based metal nano ink for printed electrodes

  • Kim, Dong-Kwon;Lee, Caroline;Hong, Seong-Je;Kim, Young-Seok
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2009.10a
    • /
    • pp.1466-1468
    • /
    • 2009
  • The preparation method of copper nanopowder by dry process for conductive ink was investigated. Inert gas condensation method was used to synthesize copper nanopowder. The produced powders was spherical and sized 10~100nm flowing the conditions. The results showed that input voltage and evaporation rate is critical variables for nano-sized copper powder.

  • PDF

Application of an electroless copper coating in alkaline bath to preparation of the metal hydride electrode (금속 수소화물 전극제조에 있어서 알카리 무전해 구리 도금법의 응용)

  • CHOI, Jeon;PARK, Choong-Nyeon
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.3 no.2
    • /
    • pp.9-15
    • /
    • 1992
  • Electroless copper plating method using an alkaline bath have been employed in copper coating of the (LM)Ni4.5Co0.1MnO.2A10.2 hydrogen storage alloy powders for electrode preparation. The plating were conducted without any pretreatment of alloy powders. For the preparation of the electrodes, about 0.12g of the copper coated alloy powder (copper to alloy ratio 1/3 by weight) was compacted with pressure of 6 tons/cm2 at room temperature. The disk-type compacts had a diameter of 10mm and thickness of about 0.24mm. The electrode characteristics were examined through SEM observations and electrochemical measurements in a half cell. The electrochemical measurement showed that the maximum discharge capacity of the electrodes prepared by using alkaline bath were 245mAh per gram of coated alloy (327mAh per gram of alloy) and appeared a considerable degradation with increasing number of cycles. The decrease of the discharge capacity after 100 cycles was about 30% It can be suggested that, with a slight of improvement, this electroless copper plating method could be applied to the preparation of the rare earth-nickel based alloy electrode.

  • PDF

Copper-Based Electrochemical CO2 Reduction and C2+ Products Generation: A Review (구리 기반 전극을 활용한 전기화학적 이산화탄소 환원 및 C2+ 화합물 생성 기술)

  • Jiwon Heo;Chaewon Seong;Vishal Burungale;Pratik Mane;Moo Sung Lee;Jun-Seok Ha
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.30 no.4
    • /
    • pp.17-31
    • /
    • 2023
  • Amidst escalating global warming fueled by indiscriminate fossil fuel consumption, concerted efforts are underway worldwide to mitigate atmospheric carbon dioxide (CO2) levels. Electrochemical CO2 reduction technology is recognized as a promising and environmentally friendly approach to convert CO2 into valuable hydrocarbon compounds, deemed essential for achieving carbon neutrality. Copper, among the various materials used as CO2 reduction electrodes, is known as the sole metal capable of generating C2+ compounds. However, low conversion efficiency and selectivity have hindered its widespread commercialization. This review highlights diverse research endeavors to address these challenges. It explores various studies focused on utilizing copper-based electrodes for CO2 reduction, offering insights into potential solutions for advancing this crucial technology.

Characterization of instability in a-Si:H TFT LCD utilizing copper as electrodes

  • Kuan, Yung-Chia;Liang, Shuo-Wei;Chiu, Hsian-Kun;Sun, Kuo-Sheng
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2006.08a
    • /
    • pp.747-751
    • /
    • 2006
  • The hydrogenated amorphous silicon thin film transistor (a-Si:H TFT) with copper as source and drain electrode has been fabricated to obtain its transfer characteristics and stressed with positive and negative bias to investigate the instability variation comparing to conventional MoW-Al based TFT device. The results show that there is no copper diffusion into active layer of a-Si:H TFT, even during the thermal process. In addition, a 15-inch XGA a Si:H TFT LCD display utilizing Cu as gate electrodes has been developed.

  • PDF

Detection of Trace Copper Metal at Carbon Nanotube Based Electrodes Using Squarewave Anodic Stripping Voltammetry

  • Choi, Changkun;Jeong, Youngsam;Kwon, Yongchai
    • Bulletin of the Korean Chemical Society
    • /
    • v.34 no.3
    • /
    • pp.801-809
    • /
    • 2013
  • We investigate sensitivity and limit of detection (LOD) of trace copper (Cu) metal using pristine carbon nanotube (CNT) and acidified CNT (ACNT) electrodes. Squarewave based anodic stripping voltammetry (SWASV) is used to determine the stripped Cu concentration. Prior to performing the SWASV measurements, its optimal conditions are determined and with that, effects of potential scan rate and $Cu^{2+}$ concentration on stripping current are evaluated. The measurements indicate that (1) ACNT electrode shows better results than CNT electrode and (2) stripping is controlled by surface reaction. In the given $Cu^{2+}$ concentration range of 25-150 ppb, peak stripping current has linearity with $Cu^{2+}$ concentration. Quantitatively, sensitivity and LOD of Cu in ACNT electrode are 9.36 ${\mu}A\;{\mu}M^{-1}$ and 3 ppb, while their values are 3.99 ${\mu}A\;{\mu}M^{-1}$ and 3 ppb with CNT electrode. We evaluate the effect of three different water solutions (deionized water, tap water and river water) on stripping current and the confirm types of water don't affect the sensitivity of Cu. It turns out by optical inspection and cyclic voltammetry that superiority of ACNT electrode to CNT electrode is attributed to exfoliation of CNT bundles and improved interfacial adhesion occurring during oxidation of CNTs.

Review on Oxidation Resistance Technology for Copper Nanowire Transparent Electrodes (구리 나노와이어 투명 전극의 산화 방지 기술)

  • Gieop Lee;Hokyun Rho;Hyung Gu Kim;Jun-Seok Ha
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.30 no.2
    • /
    • pp.21-32
    • /
    • 2023
  • CuNWs(Copper nanowires) are attracting attention as a transparent electrode material because of their excellent electrical conductivity, high mechanical flexibility, and cost-effectiveness. However, since copper nanowires are easily oxidized, there is a disadvantage that properties of the transparent electrode may be deteriorated due to this, and researches are being conducted to improve this. Accordingly, in this review, various methods and studies to prevent oxidation and improve stability of copper nanowire transparent electrodes by using coating materials such as carbon-based materials, metals, and conductive polymers are introduced. Through this, we intend to provide solutions to solve the problem of development and oxidation of copper nanowire-based technology.