• Title/Summary/Keyword: Flexible printed electronics

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Investigation on Microstructure and Electrical Properties of Silver Conductive Features Using a Powder Composed of Silver nanoparticles and Nanoplatelets (은 나노입자-나노플레이트 혼합 분말로 형성된 은 전도성 배선의 미세조직 및 전기적 특성 연구)

  • Goo, Yong-Sung;Choa, Yong-Ho;Hwangbo, Young;Lee, Young-In
    • Journal of Powder Materials
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    • v.23 no.5
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    • pp.358-363
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    • 2016
  • Noncontact direct-printed conductive silver patterns with an enhanced electrical resistivity are fabricated using a silver ink with a mixture of silver nanoparticles and nanoplates. The microstructure and electrical resistivity of the silver pattern are systematically investigated as a function of the mixing ratio of the nanoparticles and nanoplates. The pattern, which is fabricated using a mixture with a mixing ratio of 3(nanoparticles):7(nanoplates) and sintered at $200^{\circ}C$ shows a highly dense and well-sintered microstructure and has a resistivity of $7.60{\mu}{\Omega}{\cdot}cm$. This originates a mutual synergistic effect through a combination of the sinterability of the nanoparticles and the packing ability of the nanoplates. This is a conductive material that can be used to fabricate noncontact direct-printed conductive patterns with excellent electrical conductivity for various flexible electronics applications, including solar cells, displays, RFIDs, and sensors.

Development of Pneumatic Ink Supply System for Electrostatic head on Meniscus control (메니스커스 제어를 위한 정전기력 헤드용 공압 잉크공급장치 개발)

  • Yang, Young-Jin;Ko, Jeong-Beom;Dang, Hyun-Woo;Kim, Hyung-Chan;Choi, Kyung-Hyun;Cho, Kyung-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.4
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    • pp.455-460
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    • 2012
  • The Electrostatic Inkjet system has many applications in cost and time effective manufacturing of printed electronics like RFIDs, OLEDs and flexible displays etc. This paper presents pneumatic ink supply system for an electrohydrodynamic deposition (EHD) setup for the precise pressure control to produce a small amount of discharge at the end of the capillary. The meniscus shape depends upon the applied pneumatic pressure to the ink supply system. Furthermore, this paper also compares meniscus shapes at different applied pneumatic pressures. It is concluded that patterning of constant line-width can be achieved better by controlling the meniscus shape using this technique.

Inkjet Printing of Customized Silver Ink for Cellulose Electro Active Paper (셀룰로오스 EAPap 용 은잉크 제조 및 잉크젯 프린팅)

  • Mun, Seongcheol;Khondoker, Mohammad Abu Hasan;Kafy, Abdullahil;Mohiuddin, M.d.;Kim, Jaehwan
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.8
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    • pp.737-742
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    • 2014
  • This paper reports a customized silver ink and its inkjet printing process on a cellulose electro-active paper (EAPap). To synthesize a silver ink, silver nanoparticle is synthesized from silver nitrate, polyvinylpyrrolidone and ethylene glycol, followed by adding a viscosifier, hydroxyethyl-cellulose solution, and a surfactant, diethylene glycol. The silver ink is used in an inkjet printer (Fujifilm Dimatix DMP-2800 series) to print silver electrodes on cellulose EAPap. After printing, the electrodes are heat treated at $200^{\circ}C$. The sintered electrodes show that the thickness of the electrodes linearly increases as the number of printing layers increases. The electrical resistivity of the printed electrodes is $23.5{\mu}{\Omega}-cm$. This customized ink can be used in inkjet printer to print complex electrode patterns on cellulose EAPap to fabricate flexible smart actuators, flexible electronics and sensors.

Crossover from weak anti-localization to weak localization in inkjet-printed Ti3C2Tx MXene thin-film

  • Jin, Mi-Jin;Um, Doo-Seung;Ogbeide, Osarenkhoe;Kim, Chang-Il;Yoo, Jung-Woo;Robinson, J. W. A.
    • Advances in nano research
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    • v.13 no.3
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    • pp.259-267
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    • 2022
  • Two-dimensional (2D) transition metal carbides/nitrides or "MXenes" belong to a diverse-class of layered compounds, which offer composition- and electric-field-tunable electrical and physical properties. Although the majority of the MXenes, including Ti3C2Tx, are metallic, they typically show semiconductor-like behaviour in their percolated thin-film structure; this is also the most common structure used for fundamental studies and prototype device development of MXene. Magnetoconductance studies of thin-film MXenes are central to understanding their electronic transport properties and charge carrier dynamics, and also to evaluate their potential for spin-tronics and magnetoelectronics. Since MXenes are produced through solution processing, it is desirable to develop deposition strategies such as inkjet-printing to enable scale-up production with intricate structures/networks. Here, we systematically investigate the extrinsic negative magnetoconductance of inkjetprinted Ti3C2Tx MXene thin-films and report a crossover from weak anti-localization (WAL) to weak localization (WL) near 2.5K. The crossover from WAL to WL is consistent with strong, extrinsic, spin-orbit coupling, a key property for active control of spin currents in spin-orbitronic devices. From WAL/WL magnetoconductance analysis, we estimate that the printed MXene thin-film has a spin orbit coupling field of up to 0.84 T at 1.9 K. Our results and analyses offer a deeper understanding into microscopic charge carrier transport in Ti3C2Tx, revealing promising properties for printed, flexible, electronic and spinorbitronic device applications.

Flexible Microfluidic Metamaterial Absorber for Remote Chemical Sensor Application (원격 화학 센서로 활용 가능한 플렉서블 미세유체 메타물질 흡수체)

  • Kim, Hyung Ki;Lim, Sungjoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.2
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    • pp.123-130
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    • 2016
  • In this paper, a novel flexible microfluidic metamaterial absorber is proposed for remote chemical sensor applications. The proposed metamaterial absorber consists of a periodic of split-ring-cross resonators(SRCRs) and a microfluidic channel. The SRCR patterns are inkjet-printed using silver nanoparticle inks on paper. The microfluidic channels are laser-etched on polydimethylsiloxane(PDMS) material. The proposed absorber can detect change of the effective permittivity at different liquids. Therefore, the absorber can be used for a remote chemical sensor by detecting change of the resonant frequencies. The performance of the proposed absorber is demonstrated with full-wave simulation and measurement results. The experimental results shows that the resonant frequency is 10.49 GHz at the empty channel. When ethanol and DI-water are injected into the channel, the resonant frequencies are 10.04 GHz and 8.9 GHz, respectively.

Investigating the Effect of Photoinitiator Types and Contents on the Photocuring Behavior of Photocurable Inks and Their Applications for Etching Resist Inks (광개시제 종류 및 함량에 따른 광경화형 잉크의 광경화 특성과 인쇄회로기판용 에칭 레지스트 소재로의 적용성 연구)

  • Bo-Young Kim;Subin Jo;Gwajeong Jeong;Seong Dae Park;Jihoon Kim;Eui-Keun Choi;Myong Jae Yoo;Hyunseung Yang
    • Applied Chemistry for Engineering
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    • v.34 no.4
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    • pp.444-449
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    • 2023
  • As electronic devices become smaller and more integrated, the demand for manufacturing thin, flexible printed circuit boards (FPCBs) has increased. Although FPCBs are conventionally manufactured by a photolithography method using dry film resist, this process is complicated, and the mask is specifically designed to obtain the precision of the desired circuit line width. In this regard, manufacturing FPCBs with fine patterns through the direct printing method of photocurable inks has gained growing attention. Since the manufacturing process of FPCBs is based on the direct printing method that includes etching and stripping processes utilizing acid and basic chemicals, controlling the adhesion strength, the etching resistance, and the strippability of photocured inks has drawn a lot of attention for the fabrication of fine patterns through photocurable inks. In this study, acrylic ink with various types and contents of the photoinitiator was prepared, and the curing behavior was analyzed. Also, the adhesion strength, etching resistance, and strippability were analyzed to evaluate the applicability of developed photocurable etching resist inks.

Effects of Poly(Styrene-Co-Maleic acid) as Adhesion Promoter on Rheology of Aqueous Cu Nanoparticle Ink and Adhesion of Printed Cu Pattern on Polyimid Film (수계 Cu 나노입자 잉크에서 Poly(styrene-co-maleic acid) 접착 증진제가 잉크 레올로지와 인쇄패턴의 접착력에 미치는 영향)

  • Jo, Yejin;Seo, Yeong-Hui;Jeong, Sunho;Choi, Youngmin;Kim, Eui Duk;Oh, Seok Heon;Ryu, Beyong-Hwan
    • Korean Journal of Materials Research
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    • v.25 no.12
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    • pp.719-726
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    • 2015
  • For a decade, solution-processed functional materials and various printing technologies have attracted increasingly the significant interest in realizing low-cost flexible electronics. In this study, Cu nanoparticles are synthesized via the chemical reduction of Cu ions under inert atmosphere. To prevent interparticle agglomeration and surface oxidation, oleic acid is incorporated as a surface capping molecule and hydrazine is used as a reducing agent. To endow water-compatibility, the surface of synthesized Cu nanoparticles is modified by a mixture of carboxyl-terminated anionic polyelectrolyte and polyoxylethylene oleylamine ether. For reducing the surface tension and the evaporation rate of aqueous Cu nanoparticle inks, the solvent composition of Cu nanoparticle ink is designed as DI water:2-methoxy ethanol:glycerol:ethylene glycol = 50:20:5:25 wt%. The effects of poly(styrene-co-maleic acid) as an adhesion promoter(AP) on rheology of aqueous Cu nanoparticle inks and adhesion of Cu pattern printed on polyimid films are investigated. The 40 wt% aqueous Cu nanoparticle inks with 0.5 wt% of Poly(styrene-co-maleic acid) show the "Newtonian flow" and has a low viscosity under $10mPa{\cdots}S$, which is applicable to inkjet printing. The Cu patterns with a linewidth of $50{\sim}60{\mu}m$ are successfully fabricated. With the addition of Poly(styrene-co-maleic acid), the adhesion of printed Cu patterns on polyimid films is superior to those of patterns prepared from Poly(styrene-co-maleic acid)-free inks. The resistivities of Cu films are measured to be $10{\sim}15{\mu}{\Omega}{\cdot}cm$ at annealing temperature of $300^{\circ}C$.

Fabrication of Ag Grid Patterned PET Substrates by Thermal Roll-Imprinting for Flexible Organic Solar Cells (가열롤 임프린팅 방법을 이용한 유연 유기태양전지용 Ag 그리드 패턴 PET 기판 제작)

  • Cho, Jung Min;Jo, Jeongdai;Kim, Taeil;Kim, Dong Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.11
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    • pp.993-998
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    • 2014
  • Silver (Ag) grid patterned PET substrates were manufactured by thermal roll-imprinting methods. We coated highly conductive layer (HCL) as a supply electrode on the Ag grid patterned PET in the three kinds of conditions. One was no-HCL without conductive PEDOT:PSS on the Ag grid patterned PET substrate, another was thin-HCL coated with ~50 nm thickness of conductive PEDOT:PSS on the Ag grid PET, and the other was thick-HCL coated with ~95 nm thickness of conductive PEDOT:PSS. These three HCLs in order showed 73.8%, 71.9%, and 64.7% each in transmittance, while indicating $3.84{\Omega}/{\Box}$, $3.29{\Omega}/{\Box}$, and $2.65{\Omega}/{\Box}$ each in sheet resistance. Fabrication of organic solar cells (OSCs) with HCL Ag grid patterned PET substrates showed high power conversion efficiency (PCE) on the thin-HCL device. The thick-HCL device decreased efficiency due to low open circuit voltage ($V_{OC}$). And the Ag grid pattern device without HCL had the lowest energy efficiency caused by quite low short current density ($J_{SC}$).

Wearable Personal Network Based on Fabric Serial Bus Using Electrically Conductive Yarn

  • Lee, Hyung-Sun;Park, Choong-Bum;Noh, Kyoung-Ju;SunWoo, John;Choi, Hoon;Cho, Il-Yeon
    • ETRI Journal
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    • v.32 no.5
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    • pp.713-721
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    • 2010
  • E-textile technology has earned a great deal of interest in many fields; however, existing wearable network protocols are not optimized for use with conductive yarn. In this paper, some of the basic properties of conductive textiles and requirements on wearable personal area networks (PANs) are reviewed. Then, we present a wearable personal network (WPN), which is a four-layered wearable PAN using bus topology. We have designed the WPN to be a lightweight protocol to work with a variety of microcontrollers. The profile layer is provided to make the application development process easy. The data link layer exchanges frames in a master-slave manner in either the reliable or best-effort mode. The lower part of the data link layer and the physical layer of WPN are made of a fabric serial-bus interface which is capable of measuring bus signal properties and adapting to medium variation. After a formal verification of operation and performances of WPN, we implemented WPN communication modules (WCMs) on small flexible printed circuit boards. In order to demonstrate the behavior of our WPN on a textile, we designed a WPN tutorial shirt prototype using implemented WCMs and conductive yarn.

A Wireless Intraocular Pressure Sensor with Variable Inductance Using a Ferrite Material

  • Kang, Byungjoo;Hwang, Hoyong;Lee, Soo Hyun;Kang, Ji Yoon;Park, Joung-Hu;Seo, Chulhun;Park, Changkun
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.13 no.4
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    • pp.355-360
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    • 2013
  • A wireless intraocular (IOP) pressure sensor based on micro electro mechanical system (MEMS) technology is proposed. The proposed IOP sensor uses variable inductance according to the external pressure. The proposed sensor is composed of two flexible membranes: a ferrite bottom part, an inductor, and a capacitor. The inductance of the sensor varies according to the external pressure. The resonance frequency of the sensor is also varied, and this frequency is detected using an external coil. The external coil is designed with an FR-4 printed circuit board. The feasibility of the proposed sensor structure using variable inductance to detect the external pressure is successfully demonstrated.