Advanced Functional Materials

Cover image for Vol. 19 Issue 10

May 22, 2009

Volume 19, Issue 10

Pages 1471–1674

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
    1. Lithium Batteries: (Adv. Funct. Mater. 10/2009)

      Article first published online: 18 MAY 2009 | DOI: 10.1002/adfm.200990038

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      The cover picture is a scanning electron microscopy image of uncoated and 0.5 wt% TiO2 nanoparticle-coated LiCoO2 cathode particles, which are investigated in the research and development of lithium rechargeable batteries that require high power, high capacity, and high safety. TiO2 nanoparticles with sizes below 100 nm are mixed with LiCoO2 particles with an average particle size of 20 µm in a rotating jar at 200 rpm. The mixed particles are then fired at 1000°C for 5 h in air. The uncoated and 0.5 wt% coated particles show similar surface morphologies to each other. Despite the use of dry coating, Ti atoms appear to distribute uniformly throughout the particles. The advantage of this method is a simplified and cost-effective coating procedure, and these electrochemical enhancements can lead to versatile potential applications of the batteries, and provide breakthroughs in the power supply of mobile electronics.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
    1. Transistors: (Adv. Funct. Mater. 10/2009)

      Article first published online: 18 MAY 2009 | DOI: 10.1002/adfm.200990039

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      The inside cover picture shows ZnO-based thin-film transistors, grown at room temperature, integrated with a one-diode one-resistor (1D–1R) oxide-storage node elements, fabricated at room temperature. These stacked structures with stackable peripheral circuits offer the possibility of becoming a new building block applicable to high-density non-volatile memory devices with three-dimensionally stackable cross-point structures. Such an effective stacked memory concept utilizing an all-oxide-based device with peripheral circuits is necessary for future high-density non-volatile data storage.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
    1. Contents: (Adv. Funct. Mater. 10/2009) (pages 1471–1478)

      Article first published online: 18 MAY 2009 | DOI: 10.1002/adfm.200990040

  4. Editorial

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
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      Advances and Progress in Materials Science in Korea (pages 1479–1481)

      Jyongsik Jang

      Article first published online: 18 MAY 2009 | DOI: 10.1002/adfm.200900599

  5. Feature Articles

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
    1. Rational Design of Conjugated Polymer Supramolecules with Tunable Colorimetric Responses (pages 1483–1496)

      Dong June Ahn, Sumi Lee and Jong-Man Kim

      Article first published online: 30 DEC 2008 | DOI: 10.1002/adfm.200801074

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      The rational design of thermochromic polydiacetylenes (PDAs) by manipulating strong headgroup interactions, which leads to colorimetrically tunable systems, within the authors' groups is described. In addition, a diagnostic method for assigning colorimetric reversibility to PDAs as well as an analysis of future challenges in this area is also presented.

    2. Reversible and High-Capacity Nanostructured Electrode Materials for Li-Ion Batteries (pages 1497–1514)

      Min Gyu Kim and Jaephil Cho

      Article first published online: 26 MAR 2009 | DOI: 10.1002/adfm.200801095

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      Nanostructured electrode materials (see image) are essential for rechargeable lithium batteries that require high power, high capacity, and high safety. These electrochemical enhancements can lead to versatile potential applications of the batteries, and can provide breakthroughs for the currently limited power suppliers of mobile electronics.

    3. Control of the Morphology and Structural Development of Solution-Processed Functionalized Acenes for High-Performance Organic Transistors (pages 1515–1525)

      Jung Ah Lim, Hwa Sung Lee, Wi Hyoung Lee and Kilwon Cho

      Article first published online: 30 DEC 2008 | DOI: 10.1002/adfm.200801135

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      Solution-processed functionalized acenes have received special attention as promising organic semiconductors and provide useful benchmarks for organic electronics. In this article, the morphologies and crystalline microstructures of organic semiconductors can variously tailor from single crystals to directionally aligned crystal arrays by using controls of the solubility, the molecular interactions, and the drying conditions in solution-based film-deposition processes.

    4. Mechanical Buckling: Mechanics, Metrology, and Stretchable Electronics (pages 1526–1536)

      Dahl-Young Khang, John A. Rogers and Hong H. Lee

      Article first published online: 30 DEC 2008 | DOI: 10.1002/adfm.200801065

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      High-resolution atomic force microscopy is used to image buckled, wavy single-walled carbon nanotube (SWNT) arrays on elastomeric substrate, PDMS. From the experimentally measured buckling wavelength as a function of nanotube diameter, together with an analytical model developed based on continuum mechanics, the mechanical modulus of SWNTs is determined to be ∼1.3 TPa, which agrees well with literature values.

    5. Porous Chromium Terephthalate MIL-101 with Coordinatively Unsaturated Sites: Surface Functionalization, Encapsulation, Sorption and Catalysis (pages 1537–1552)

      Do-Young Hong, Young Kyu Hwang, Christian Serre, Gérard Férey and Jong-San Chang

      Article first published online: 20 APR 2009 | DOI: 10.1002/adfm.200801130

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      Recent ideas concerning site-selective functionalization of chromium terephtha-late MIL-101 are discussed, focusing on the utilization of unsaturated Cr(III) sites (see image). Recent advances in synthesis, selective surface functionalization, outstanding sorption properties, encapsulation of nanoobjects, and catalytic applications in MIL-101 are also discussed.

    6. New Generation of Multifunctional Nanoparticles for Cancer Imaging and Therapy (pages 1553–1566)

      Kyeongsoon Park, Seulki Lee, Eunah Kang, Kwangmeyung Kim, Kuiwon Choi and Ick Chan Kwon

      Article first published online: 14 APR 2009 | DOI: 10.1002/adfm.200801655

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      Nanobiotechnology combines nanotechnology with molecular imaging, which has led to the generation of new multifunctional nanoparticles for cancer imaging and therapy. Multifunctional nanoparticles (see image) that combine tumor-targeted imaging with therapy in an all-in-one system hold great promise for the future of cancer treatment because they can detect early stage cancer and deliver suitable therapeutic agents to enhance therapeutic efficacy.

    7. Conducting-Polymer Nanomaterials for High-Performance Sensor Applications: Issues and Challenges (pages 1567–1576)

      Hyeonseok Yoon and Jyongsik Jang

      Article first published online: 22 APR 2009 | DOI: 10.1002/adfm.200801141

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      The fascinating properties of conducting-polymer nanomaterials have inspired a worldwide effort in their application to state-of-the-art sensors (see image). Here, the important issues on conducting- polymer nanomaterials in sensor applications are discussed. Furthermore, a perspective on the next generation of sensor technology is provided.

  6. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
    1. Cell Migration: Guided Cell Migration on Microtextured Substrates with Variable Local Density and Anisotropy (Adv. Funct. Mater. 10/2009)

      Deok-Ho Kim, Chang-Ho Seo, Karam Han, Keon Woo Kwon, Andre Levchenko and Kahp-Yang Suh

      Article first published online: 18 MAY 2009 | DOI: 10.1002/adfm.200990041

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      A novel microtextured cell substrate with variable local density and anisotropy as a platform for guided cell migration is presented by A. Levchenko, K.-Y. Suh, et al. on page 1579. A simple, scalable, and cost-effective technique, capillary force lithography, is used to fabricate precise microtopographic features on an optically transparent glass coverslip. Live cell motility is found to be extremely sensitive to variation in the local density and anisotropy of rectangular lattices, with cell elongation and speed decreasing on a symmetric lattice. Cells integrate orthogonal contact guidance cues when determining the direction of their orientation and movement.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index
    1. Guided Cell Migration on Microtextured Substrates with Variable Local Density and Anisotropy (pages 1579–1586)

      Deok-Ho Kim, Chang-Ho Seo, Karam Han, Keon Woo Kwon, Andre Levchenko and Kahp-Yang Suh

      Article first published online: 6 FEB 2009 | DOI: 10.1002/adfm.200801174

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      Microtextured substrates with variable local density and anisotropy (see image) are designed to guide the organization and migration of fibroblasts in spatially desirable locations. Cell motility is sensitive to variation in the local density and anisotropy of rectangular lattice, with cell elongation and speed decreasing on symmetric lattice. Also, cells integrate orthogonal spatial cues when determining the direction of their orientation and movement.

    2. Low-Temperature-Grown Transition Metal Oxide Based Storage Materials and Oxide Transistors for High-Density Non-volatile Memory (pages 1587–1593)

      Myoung-Jae Lee, Sun I. Kim, Chang B. Lee, Huaxiang Yin, Seung-Eon Ahn, Bo S. Kang, Ki H. Kim, Jae C. Park, Chang J. Kim, Ihun Song, Sang W. Kim, Genrikh Stefanovich, Jung H. Lee, Seok J. Chung, Yeon H. Kim and Youngsoo Park

      Article first published online: 4 DEC 2008 | DOI: 10.1002/adfm.200801032

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      An all-oxide-based memory structure can be stacked by using GaInZnO thin-film transistors, grown at room temperature together with a one diode (CuO/InZnO)–one-resistor (NiO) structure oxide storage node elements, fabricated at room temperature. Such an all-oxide-based device with the stacked peripheral circuit array may lead to the terabit era.

    3. Fabrication of Ordered Nanostructured Arrays Using Poly(dimethylsiloxane) Replica Molds Based on Three-Dimensional Colloidal Crystals (pages 1594–1600)

      Hong Kyoon Choi, Mun Ho Kim, Sang Hyuk Im and O Ok Park

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adfm.200801096

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      Various polymeric nanopatterns are fabricated using poly(dimethylsiloxane) replica molds based on high-quality 3D colloidal crystals. Close-packed, non-close-packed, honeycomb-shaped, and superlattice colloidal-crystal patterns are obtained by replicating surface-modified 3D colloidal-crystal master molds (see figure).

    4. Fabrication and Optical Characteristics of Position-Controlled ZnO Nanotubes and ZnO/Zn0.8Mg0.2O Coaxial Nanotube Quantum Structure Arrays (pages 1601–1608)

      Jinkyoung Yoo, Young Joon Hong, Hye Seong Jung, Yong-Jin Kim, Chul-Ho Lee, Jeonghui Cho, Yong-Joo Doh, Le Si Dang, Kyung Ho Park and Gyu-Chul Yi

      Article first published online: 23 FEB 2009 | DOI: 10.1002/adfm.200801123

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      Position-controlled ZnO nanotubes and their coaxial nanotube quantum structure arrays are fabricated by selective metal–organic vapor-phase epitaxy (see image). Both the position-controlled nanotube and associated coaxial heterostructures arrays exhibit excellent luminescent characteristics. This simple, precise, well-controlled “bottom-up” fabrication provides a general and rational route to integrate vertical nanodevices for nanometer-scale electronics and optoelectronics.

    5. Non-volatile Ferroelectric Poly(vinylidene fluoride-co-trifluoroethylene) Memory Based on a Single-Crystalline Tri-isopropylsilylethynyl Pentacene Field-Effect Transistor (pages 1609–1616)

      Seok Ju Kang, Insung Bae, Youn Jung Park, Tae Ho Park, Jinwoo Sung, Sung Cheol Yoon, Kyung Hwan Kim, Dong Hoon Choi and Cheolmin Park

      Article first published online: 9 MAR 2009 | DOI: 10.1002/adfm.200801097

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      A single crystal of tri-isopropylsilylethynyl pentacene is utilized as an active channel for non-destructive readout of a bottom-gate ferroelectric field-effect transistor with a poly(vinylidene fluoride-co-trifluoroethylene) gate dielectric (see figure). The FET exhibits sufficient ON/OFF current bistability with excellent data retention as well as environmental stability.

    6. Inorganic Drug-Delivery Nanovehicle Conjugated with Cancer-Cell-Specific Ligand (pages 1617–1624)

      Jae-Min Oh, Soo-Jin Choi, Go-Eun Lee, Sun-Ho Han and Jin-Ho Choy

      Article first published online: 13 MAR 2009 | DOI: 10.1002/adfm.200801127

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      An inorganic drug-delivery nanovehicle, layered double hydroxide, is conjugated with a cancer-cell-specific ligand, folic acid, by a surface-modification reaction (see image). The folic-acid-conjugated layered double hydroxide shows enhanced cellular uptake and drug efficacy in folate-receptor overexpressing KB cells, indicating the delivery ability of layered double hydroxide nanovehicle with a targeting function as a result of ligand conjugation.

    7. Characteristics of Solution-Processed Small-Molecule Organic Films and Light-Emitting Diodes Compared with their Vacuum-Deposited Counterparts (pages 1625–1630)

      Tae-Woo Lee, Taeyong Noh, Hee-Won Shin, Ohyun Kwon, Jong-Jin Park, Byoung-Ki Choi, Myeong-Suk Kim, Dong Woo Shin and Yong-Rok Kim

      Article first published online: 30 MAR 2009 | DOI: 10.1002/adfm.200801045

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      The distinctive characteristics of solution-processed small-molecule films and light-emitting diodes compared to their vacuum-deposited counterparts are presented (see image). Although the solution-processed blue devices show very high luminous efficiency (8.9 cd A−1), the device lifetime is shortened, which can be ascribed to lower density of the solution-processed films.

    8. Novel Brush Polymers with Phosphorylcholine Bristle Ends: Synthesis, Structure, Properties, and Biocompatibility (pages 1631–1644)

      Gahee Kim, Samdae Park, Jungwoon Jung, Kyuyoung Heo, Jinhwan Yoon, Heesoo Kim, Ik Jung Kim, Jung Ran Kim, Jong Im Lee and Moonhor Ree

      Article first published online: 14 APR 2009 | DOI: 10.1002/adfm.200801680

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      New brush polymers with various numbers of bristle ends incorporating phosphorylcholine (PC) moieties are synthesized. The new PC-containing brush polymers (see image) form a stable molecular multi-bilayer structure in thin films and successfully mimic natural cell membrane surfaces. The hydrophilic surface of the films repels fibrinogen and platelets and exhibit bactericidal effects.

    9. Simple and Generalized Synthesis of Semiconducting Metal Sulfide Nanocrystals (pages 1645–1649)

      Sang-Hyun Choi, Kwangjin An, Eung-Gyu Kim, Jung Ho Yu, Jeong Hyun Kim and Taeghwan Hyeon

      Article first published online: 19 FEB 2009 | DOI: 10.1002/adfm.200800832

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      Uniform-sized semiconducting metal sulfide nanocrystals are synthesized from the thermolysis of metal–oleate complexes in alkanethiol. The size of the Cu2S nanocrystals can be tuned from 7 to 20 nm(see image) by varying the reaction conditions. Various shaped nanocrystals of CdS, ZnS, MnS, and PbS are synthesized from the thermal reaction of metal–oleate complex in alkanethiol.

    10. Analysis of Improved Efficiency of InGaN Light-Emitting Diode With Bottom Photonic Crystal Fabricated by Anodized Aluminum Oxidxe (pages 1650–1655)

      Sang-Wan Ryu, Joonmo Park, Jin-Kyoung Oh, Dang Hoang Long, Kwang-Woo Kwon, Young-Ho Kim, Jun Key Lee and Jin Hyeok Kim

      Article first published online: 4 MAR 2009 | DOI: 10.1002/adfm.200801125

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      A bottom photonic crystal (PC) is fabricated by anodized aluminum oxide nanopatterns to reduce threading dislocations in InGaN quantum wells grown over the PC (see image). The threading dislocations are blocked at the nanometer-sized air holes, resulting in a 23% improved optical power of the bottom PC LED compared to a reference.

    11. Generation of Monodisperse Inorganic–Organic Janus Microspheres in a Microfluidic Device (pages 1656–1662)

      Naveen Prasad, Jayakumar Perumal, Chang-Hyung Choi, Chang-Soo Lee and Dong-Pyo Kim

      Article first published online: 1 APR 2009 | DOI: 10.1002/adfm.200801181

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      Monodisperse hybrid microspheres (HJM) having organic and inorganic parts are prepared in a PDMS-based microfluidic device. The HJM have two distinct regions: a hydrophobic perfluoropolyether hemisphere and a relatively hydrophilic polycarbosilane region. After pyrolysis and subsequent oxidation, a SiC-based ceramic hemisphere (see image) is obtained by means of decomposition of the organic portion.

    12. Synthesis, Photophysical, and Electroluminescent Device Properties of Zn(II)-Chelated Complexes Based on Functionalized Benzothiazole Derivatives (pages 1663–1671)

      Soo-Gyun Roh, Yong-Hee Kim, Kang Deuk Seo, Dong Hyun Lee, Hwan Kyu Kim, Young-Il Park, Jong-Wook Park and Ji-Hoon Lee

      Article first published online: 14 APR 2009 | DOI: 10.1002/adfm.200801122

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      A series of novel Zn(II) complexes based on 2-(2-hydroxyphenyl)benzothiazole derivatives are synthesized and characterized. The influence of substituents (methyl, methoxy, hydroxy, and fluorenyl) on the photophysical, electroluminescence properties is systemically studied (see image). The RGB OLEDs using the electron-transporting layer of MeZn result in a highly reduced operating voltage and enhanced EL power efficiency compared to commercial Alq3.

  8. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Editorial
    6. Feature Articles
    7. Frontispiece
    8. Full Papers
    9. Index

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