• Title, Summary, Keyword: self-assembly

Search Result 645, Processing Time 0.039 seconds

Layer-by-layer self-assembly colorant multi-layer preparation using natural colorant Berberine and anionic polyelectrolyte (베르베린 천연색소화합물과 음이온고분자전해질을 이용한 layer-by-layer self-assembly 색소다층박막 제조)

  • Son Young-A;Park Young-Min;Lee Seung-Goo;Ravikumar K.
    • Textile Coloration and Finishing
    • /
    • v.18 no.1
    • /
    • pp.28-32
    • /
    • 2006
  • A multi-layer of the dye, natural colorant Berberine, was successfully developed by the self-assembly deposition from water-soluble cationic dye(Berberine chloride) and anionic polyelectrolyte PSS(Polysodium 4-styrenesulfonate) in aqueous solution via electrostatic attraction. The corresponding results on multi-layer were characterized by UV-Vis absorbance measurements. The growth of multi-layer formed by the sequential interaction was also determined. The findings measured by UV-Vis spectrophotometer showed that the bilayer deposition characteristic was linear and highly reproducible from layer to layer.

High Speep/High-Precision Chip Joining Using Self-Assembly Technology for Three-Dimensional Integrated Circuits (삼차원적층형 집적회로 구현을 위한 자기조직화정합기술을 이용한 고속.고정밀 접합기술)

  • Lee, Kang-Wook
    • Journal of Welding and Joining
    • /
    • v.29 no.3
    • /
    • pp.19-26
    • /
    • 2011
  • 본 논문에서는 액체의 표면장력을 이용하여 복수의 KGD 들을 웨이퍼 상태에서 일괄접합함으로써, 높은 수율의 삼차원적층칩을 빠른 생산성으로 제작할 수 있는, 고속 고정밀 접합기술인 자기조직화정합 (Selfassembly) 기술에 대해 소개를 하였다. 본 연구실에서 개발한 self-assembly 기술을 적용하여 5mm 각(角) 크기의 칩 500개를 1초 이내에 평균 $0.5{\mu}m$ 정도의 높은 정밀도로 8인치 웨이퍼상에 일괄접합시키는데 성공하였다. Self-assembly 기술에 의한 삼차원 칩 적층방식은, 기존의 pick-and-place 적층방식에서 높은 정밀도의 접합특성을 확보하는데 필요한 공정시간을 혁신적으로 단축하는 것이 가능하고, 웨이퍼 레벨에서 복수의 KGD 들을 일괄접합하는 것이 가능하므로, 향후 TSV 기술의 양산화를 실현하는데 적합한 고속 고정밀 접합 기술로서 기대가 크다. 현재 본 연구실에서는 두께가 $50{\mu}m$ 이하의 얇은 LSI 칩 및 메탈범프가 형성된 LSI 칩 등을 이용하여, self-assembly 기술에 의한 삼차원 적층형 집적회로 구현을 위한 접합기술을 개발 중에 있다.

Control of Surface Chemistry and Electrochemical Performance of Carbon-coated Silicon Anode Using Silane-based Self-Assembly for Rechargeable Lithium Batteries

  • Choi, Hyun;Nguyen, Cao Cuong;Song, Seung-Wan
    • Bulletin of the Korean Chemical Society
    • /
    • v.31 no.9
    • /
    • pp.2519-2526
    • /
    • 2010
  • Silane-based self-assembly was employed for the surface modification of carbon-coated Si electrodes and their surface chemistry and electrochemical performance in battery electrolyte depending on the molecular structure of silanes was studied. IR spectroscopic analyses revealed that siloxane formed from silane-based self-assembly possessed Si-O-Si network on the electrode surface and high surface coverage siloxane induced the formation of a stable solid-electrolyte interphase (SEI) layer that was mainly composed of organic compounds with alkyl and carboxylate metal salt functionalities, and PF-containing inorganic species. Scanning electron microscopy imaging showed that particle cracking were effectively reduced on the carbon-coated Si when having high coverage siloxane and thickened SEI layer, delivering > 1480 mAh/g over 200 cycles with enhanced capacity retention 74% of the maximum discharge capacity, in contrast to a rapid capacity fade with low coverage siloxane.

Development of New Biochip using Magnetic Interaction and Random Fluidic Self-assembly (자기력과 Random Fluidic Self-assembly에 의한 신규 바이오칩의 개발)

  • Choi, Yong-Sung;Kwon, Young-Soo;Park, Dae-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.17 no.6
    • /
    • pp.615-621
    • /
    • 2004
  • This paper describes a new constructing method of multifunctional biosensor using many kinds of biomaterials. A metal particle and an array was fabricated by photolithographic. Biomaterials were immobilized on the metal particle. The array and the particles were mixed in a buffer solution, and were arranged by magnetic force interaction and random fluidic self-assembly. A quarter of total Ni dots were covered by the particles. The binding direction of the particles was controllable, and condition of particles was almost with Au surface on top. The particles were successfully arranged on the array. The biomaterial activities were detected by chemiluminescence and electrochemical methods.

Self-assembly Coloration Approach on Cotton Fibers using Porphyrin

  • Kim, Byung-Soon;Li, Xiachuan;Kim, Sung-Hoon;Bae, Jin-Seo;Son, Young-A
    • Textile Coloration and Finishing
    • /
    • v.20 no.5
    • /
    • pp.23-27
    • /
    • 2008
  • In this work, poly(diallyldimethylammoniumchloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin were considered to produce the self-assembly fabrication films. This method is based on the layer-by-layer (LbL) deposition produced by the electrostatic attraction between positively charged PDDAC and negatively charged porphyrin ions. The result of multilayer fabrication was discussed with the level of color strength (K/S). K/S spectra of the fabricated multilayer films showed gradual increase behaviors. In addition, the color photo images of the fabricated multilayer films showed that PDDAC and porphyrin were successfully attracted by electrostatic self-assembly forces.

Si-Containing Nanostructures for Energy-Storage, Sub-10 nm Lithography, and Nonvolatile Memory Applications

  • Jeong, Yeon-Sik
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • /
    • pp.108-109
    • /
    • 2012
  • This talk will begin with the demonstration of facile synthesis of silicon nanostructures using the magnesiothermic reduction on silica nanostructures prepared via self-assembly, which will be followed by the characterization results of their performance for energy storage. This talk will also report the fabrication and characterization of highly porous, stretchable, and conductive polymer nanocomposites embedded with carbon nanotubes (CNTs) for application in flexible lithium-ion batteries. It will be presented that the porous CNT-embedded PDMS nanocomposites are capable of good electrochemical performance with mechanical flexibility, suggesting these nanocomposites could be outstanding anode candidates for use in flexible lithium-ion batteries. Directed self-assembly (DSA) of block copolymers (BCPs) can generate uniform and periodic patterns within guiding templates, and has been one of the promising nanofabrication methodologies for resolving the resolution limit of optical lithography. BCP self-assembly processing is scalable and of low cost, and is well-suited for integration with existing semiconductor manufacturing techniques. This talk will introduce recent research results (of my research group) on the self-assembly of Si-containing block copolymers for the achievement of sub-10 nm resolution, fast pattern generation, transfer-printing capability onto nonplanar substrates, and device applications for nonvolatile memories. An extraordinarily facile nanofabrication approach that enables sub-10 nm resolutions through the synergic combination of nanotransfer printing (nTP) and DSA of block copolymers is also introduced. This simple printing method can be applied on oxides, metals, polymers, and non-planar substrates without pretreatments. This talk will also report the direct formation of ordered memristor nanostructures on metal and graphene electrodes by the self-assembly of Si-containing BCPs. This approach offers a practical pathway to fabricate high-density resistive memory devices without using high-cost lithography and pattern-transfer processes. Finally, this talk will present a novel approach that can relieve the power consumption issue of phase-change memories by incorporating a thin $SiO_x$ layer formed by BCP self-assembly, which locally blocks the contact between a heater electrode and a phase-change material and reduces the phase-change volume. The writing current decreases by 5 times (corresponding to a power reduction of 1/20) as the occupying area fraction of $SiO_x$ nanostructures varies.

  • PDF