• Title/Summary/Keyword: Stretchable electrode

Search Result 35, Processing Time 0.029 seconds

Development of Stretchable PZT/PDMS Nanocomposite Film with CNT Electrode

  • Yun, Ji Sun;Jeong, Young Hun;Nam, Joong-Hee;Cho, Jeong-Ho;Paik, Jong-Hoo
    • Journal of Sensor Science and Technology
    • /
    • v.22 no.6
    • /
    • pp.400-403
    • /
    • 2013
  • The piezoelectric composite film of ferroelectric PZT ceramic ($PbZr_xTi_{1-x}O_3$) and polymer (PDMS, Polydimethylsiloxane) was prepared to improve the flexibility of piezoelectric material. The bar coating method was applied to fabricate flexible nanocomposite film with large surface area by low cost process. In the case of using metal electrode on the composite film, although there is no problem by bending process, the electrode is usually broken away from the film by stretching process. However, the well-attached, flexible CNT electrode on PZT/PDMS film improved flexibility, especially stretchability. PZT particles was usually settled down into polymer matrix due to gravity of the weighty particle, so to improve the dispersion of PZT powder in polymer matrix, small amount of additives (CNT powder, Carbon nanotube powder) was physically mixed with the matrix. By stretching the film, an output voltage of PZT(70 wt%)/PDMS with CNT (0.5 wt%) was measured.

Silver Nanowire-based Stretchable and Transparent Electrodes (Silver Nanowire 기반 Stretchable 투명 전극)

  • Lee, Jin-Young;Kim, Su-Yeon;Jeong, Da-Hye;Shin, Dong-Kyun;Yoo, Su-Ho;Seo, Hwa-Il;Park, Jong-Woon
    • Journal of the Semiconductor & Display Technology
    • /
    • v.14 no.3
    • /
    • pp.51-55
    • /
    • 2015
  • We have fabricated silver nanowire (AgNW) films as a stretchable and transparent electrode on polydimethylsiloxane (PDMS) substrates using a spray coater. Inherently, they show poor surface roughness and stretchability. To tackle it, we have employed a conductive polymer, poly (3,4-ethylenedioxythiophene) : Poly(styrene sulfonate) (PEDOT : PSS). PEDTO : PSS solution is mixed with AgNWs or spin-coated on the AgNW film. Compared with AgNW film only, PEDOT : PSS film only, and polymer-mixed AgNW films, the AgNW/polymer bilayer films exhibit much better surface roughness and stretchability. It is found that spray-coating of AgNWs on uncured PDMS and spin-coating of PEDOT : PSS solution on the AgNW films enhance the surface roughness of electrodes. Such a bilayer structure also provides a stable resistance under tensile strain due to the fact that each layer acts as a detour route for carriers. With this structure, we have obtained the peak-to-peak roughness ($R_{pv}$) as low as 76.8nm and a moderate increase of sheet resistance (from $10{\Omega}/{\Box}$ under 0% strain to $30{\Omega}/{\Box}$ under 40% strain).

MPTMS Treated Au/PDMS Membrane for Flexible and Stretchable Strain Sensors

  • Yang, Seongjin;Lim, Hyun Jee;Jeon, Hyungkook;Hong, Seong Kyung;Shin, Jung Hwal
    • Journal of Sensor Science and Technology
    • /
    • v.25 no.4
    • /
    • pp.247-251
    • /
    • 2016
  • Au/PDMS membranes are widely used to fabricate strain sensors which can detect input signals. An interfacial adhesion between metal films and polydimethylsiloxane (PDMS) substrates is one of the important factors determining the performance of strain sensors, in terms of robustness, reliability, and sensitivity. Here, we fabricate Au/PDMS membranes with (3-mercaptopropyl) trimethoxysilane (MPTMS) treatment. PDMS membranes were fabricated by spin-coating and the thickness was controlled by varying the spin rates. Au electrodes were deposited on the PDMS membrane by metal sputtering and the thickness was controlled by varying sputtering time. Owing to the MPTMS treatment, the interfacial adhesion between the Au electrode and the PDMS membrane was strengthened and the membrane was highly transparent. The Au electrode, fabricated with a sputtering time of 50 s, had the highest gauge factor at a maximum strain of ~0.7%, and the Au electrode fabricated with a sputtering time of 60 s had the maximum strain range among sputtering times of 50, 60, and 120 s. Our technique of using Au/PDMS with MPTMS treatment could be applied to the fabrication of strain sensors.

Study on the Electrochemical Characteristics of a EGaIn Liquid Metal Electrode for Supercapacitor Applications (수퍼커패시터 응용을 위한 EGaIn 액체 금속 전극의 전기화학 특성 연구)

  • SO, JU-HEE;KOO, HYUNG-JUN
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.27 no.2
    • /
    • pp.176-181
    • /
    • 2016
  • Recent years, supercapacitors have been attracting a growing attention as an efficient energy storage, due to their long-lifetime, device reliability, simple device structure and operation mechanism and, most importantly, high power density. Along with the increasing interest in flexible/stretchable electronics, the supercapacitors with compatible mechanical properties have been also required. A eutectic gallium-indium (EGaIn) liquid metal could be a strong candidate as a soft electrode material of the supercapacitors because of its insulating surface oxide layer for electric double layer formation. Here, we report the electrochemical study on the charging/reaction process at the interface of EGaIn liquid metal and electrolyte. Numerical fitting of the charging current curves provides the capacitance of EGaIn/insulating layer/electrolyte (${\sim}38F/m^2$). This value is two orders of magnitude higher than a capacitance of a general metal electrode/electrolyte interface.

Fabrication and Transfer of Laser Induced Graphene (LIG) Electrode for Flexible Substrate-based Electrochemical Sensor Applicatins (유연 기판 기반 전기화학 센서 응용을 위한 레이저 유도 그래핀 전극 제작 및 전사 연구)

  • Kim, Jeong Dae;Kim, Taeheon;Pak, Jungho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.3
    • /
    • pp.406-412
    • /
    • 2018
  • This paper describes the fabrication process of laser induced graphene (LIG) and its transfer method on to a flexible and stretchable PDMS substrate. By irradiating CO2 laser on a polyimide(PI) film surface, a localized high temperature is created, resulting in a three-dimensional porous graphene network structure with good conductivity. This LIG electrode is relatively easy to fabricate and since it is very weak the LIG electrode was transferred to a flexible PDMS substrate to increase the sturdiness as well as possible use in flexible applications. Sheet resistance, thickness, and electrochemical activity of the fabricated in-situ LIG electrodes have been examined and compared with the LIG electrodes after transferring to PDMS elastomer. The properties of the LIG electrodes were also examined depending on the $CO_2$ laser power. As the irradiated laser power increased, the LIG electrode resistance decreases and the LIG electrode thickness increased. At 4.8 W of laser power, the average sheet resistance and thickness of the fabricated LIG electrodes were approximately $31.7{\Omega}/{\Box}$ and $62.67{\mu}m$, respectively. Moreover, the electrochemical activity of the fabricated LIG electrode at 4.8 W of laser power showed a high oxidation current of $28.2{\mu}A$ after transferring to PDMS.

Fused Deposition Modeling 3D Printing-based Flexible Bending Sensor (FDM 3D프린팅 기반 유연굽힘센서)

  • Lee, Sun Kon;Oh, Young Chan;Kim, Joo Hyung
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.19 no.1
    • /
    • pp.63-71
    • /
    • 2020
  • Recently, to improve convenience, flexible electronics are quickly being developed for a number of application areas. Flexible electronic devices comprise characters such as being bendable, stretchable, foldable, and wearable. Effectively manufacturing flexible electronic devices requires high efficiency, low costs, and simple processes for manufacturing technology. Through this study, we enabled the rapid production of multifunctional flexible bending sensors using a simple, low-cost Fused Deposition Modeling (FDM) 3D printer. Furthermore, we demonstrated the possibility of the rapid production of a range of functional flexible bending sensors using a simple, low-cost FDM 3D printer. Accurate and reproducible functional materials made by FDM 3D printers are an effective tool for the fabrication of flexible sensor electronic devices. The 3D-printed flexible bending sensor consisted of polyurethane and a conductive filament. Two patterns of electrodes (straight and Hilbert curve) for the 3D printing flexible sensor were fabricated and analyzed for the characteristics of bending displacement. The experimental results showed that the straight curve electrode sensor sensing ability was superior to the Hilbert curve electrode sensor, and the electrical conductivity of the Hilbert curve electrode sensor is better than the straight curve electrode sensor. The results of this study will be very useful for the fabrication of various 3D-printed flexible sensor devices with multiple degrees of freedom that are not limited by size and shape.

MEMS Capacitive Gap Sensor for Measuring Abrasion Depth of Gun Barrel Rifling (포신 강선의 마모 깊이 측정을 위한 정전용량 방식의 MEMS 간극센서)

  • Lee, Seok-Chan;Lee, Seung-Seob;Lee, Chang-Hwa
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.33 no.9
    • /
    • pp.976-981
    • /
    • 2009
  • MEMS capacitive gap sensor is developed for measuring abrasion depth of gun barrel rifling. Measuring abrasion depth of gun barrel rifling is very important because it is related with exactness of firing and life of arms. The method using a gap sensor is not to hurt rifling. And it can measure abrasion depth through minimum shooting, because the developed gap sensor can measure from $1{\mu}m{\sim}12{\mu}m$ using Polydimethylsiloxane(PDMS) material and making a stretchable electrode on PDMS. And it's resolution is 1 ${\mu}m$ using capacitive method and MEMS technology.

Novel Flexible Supercapacitors Fabricated by Simple Integration of Electrodes, Binders, and Electrolytes into Glass Fibre Separators

  • Yoo, Joung Eun;Bae, Joonho
    • Journal of the Korean Electrochemical Society
    • /
    • v.17 no.4
    • /
    • pp.237-244
    • /
    • 2014
  • We report novel and simple structure of supercapacitors fabricated by using flexible glass fibre separators as templates. This method does not require separate electrodes, binders and high pressure/temperature to build the supercapacitor unit cells as required by the conventional technology. The supercapacitors were fabricated by drop-casting solution mixtures of carbonaceous active materials/gel electrolytes onto two sides of glass fibre separators. Two carbonaceous materials (nanoscaled activated carbons, multi-walled carbon nanotubes) were investigated as electrode materials. The electrochemical measurements reveal that the separatorbased supercapacitors using ACs successfully demonstrated significant mass specific capacitance ($22.3F\;g^{-1}$) and energy density ($9.7Wh\;kg^{-1}$), indicating this method can be useful in fabricating flexible, wearable and stretchable energy storage devices in more straightforward and cost-effective way than current technology.

Fabrication of flexible sponge electrodes using Ag nanowires (은나노와이어 함침 유연 스펀지 전극 제조)

  • Park, Kyoung Ryeol;Yoo, Sehoon;Ryu, Jeong Ho;Mhin, Sungwook
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.30 no.5
    • /
    • pp.189-193
    • /
    • 2020
  • Recently, various methods for preparing a flexible electrode for implementing a wearable sensor have been introduced. Wearable sensors show similar tendency to use various polymer substrates, which provides elasticity suitable to the motion of human body. In this paper, a highly elastic silver nanowire based electrode was prepared on a sponge-based stretchable substrate, and electrical properties were evaluated. Silver nanowires were grown using a wet chemical synthesis, impregnated into a plasma-treated sponge, and then heat treated at a low temperature. In particular, the plasma surface treatment of the sponge enables uniform coating of silver nanowires. The flexible sponge electrode showed reliable electrical resistance changes over 160 repeated tensile-compression cycles.

Synthesis and characterization of amorphous NiWO4 nanostructures

  • Nagaraju, Goli;Cha, Sung Min;Yu, Jae Su
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2016.02a
    • /
    • pp.392.1-392.1
    • /
    • 2016
  • Nowadays, research interest in developing the wearable devices are growing remarkably. Portable consumer electronic systems are becoming lightweight, flexible and even wearable. In fact, wearable electronics require energy storage device with thin, foldable, stretchable and conformable properties. Accordingly, developing the flexible energy storage devices with desirable abilities has become the main focus of research area. Among various energy storage devices, supercapacitors have been considered as an attractive next generation energy storage device owing to their advantageous properties of high power density, rapid charge-discharge rate, long-cycle life and high safety. The energy being stored in pseudocapacitors is relatively higher compared to the electrochemical double-layer capacitors, which is due to the continuous redox reactions generated in the electrode materials of pseudocapacitors. Generally, transition metal oxides/hydroxide (such as $Co_3O_4$, $Ni(OH)_2$, $NiFe_2O_4$, $MnO_2$, $CoWO_4$, $NiWO_4$, etc.) with controlled nanostructures (NSs) are used as electrode materials to improve energy storage properties in pseudocapacitors. Therefore, different growth methods have been used to synthesize these NSs. Of various growth methods, electrochemical deposition is considered to be a simple and low-cost method to facilely integrate the various NSs on conductive electrodes. Herein, we synthesized amorphous $NiWO_4$ NSs on cost-effective conductive textiles by a facile electrochemical deposition. The as-grown amorphous $NiWO_4$ NSs served as a flexible and efficient electrode for energy storage applications.

  • PDF