Advanced Functional Materials

Cover image for Vol. 22 Issue 9

May 9, 2012

Volume 22, Issue 9

Pages 1773–1988

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    6. Contents
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    1. Thermomagnetic Materials: Thermomagnetic Properties Improved by Self-Organized Flower-Like Phase Separation of Ferromagnetic Co2Dy0.5Mn0.5Sn (Adv. Funct. Mater. 9/2012) (page 1773)

      Michael Schwall, Leslie M. Schoop, Siham Ouardi, Benjamin Balke, Claudia Felser, Peter Klaer and Hans-Joachim Elmers

      Article first published online: 2 MAY 2012 | DOI: 10.1002/adfm.201290053

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      On page 1822, Benjamin Balke and co-workers report the thermodynamically stable phase separation of a Heusler compound induced by rapid cooling from the liquid phase. A linear combination of the different element-specific energy-dispersive X-ray (EDX) mappings (with brightness proportional to the concentration) is shown. The phase separation forms an ordered 3D flower-like structure on the microscale.

  2. Inside Front Cover

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    1. Quantum Dots: Ultrasensitive, Biocompatible, Quantum-Dot-Embedded Silica Nanoparticles for Bioimaging (Adv. Funct. Mater. 9/2012) (page 1774)

      Bong-Hyun Jun, Do Won Hwang, Heung Su Jung, Jaeho Jang, Hyunsoo Kim, Homan Kang, Taegyu Kang, San Kyeong, Hyeokjae Lee, Dae Hong Jeong, Keon Wook Kang, Hyewon Youn, Dong Soo Lee and Yoon-Sik Lee

      Article first published online: 2 MAY 2012 | DOI: 10.1002/adfm.201290054

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      On page 1843, Dong Soo Lee, Yoon-Sik Lee, and co-workers investigate very bright quantum dot (QD)-based probes for effective bioimaging. Silica-coated, QD-embedded silica nanoparticles (Si@QDs@Si NPs) containing QDs composed of CdSe@ZnS (core-shell) are prepared to compare the structure-based advantages with single QDs having similar quantum yields. The excellence of Si@QDs@Si NPs is illustrated by significantly enhanced fluorescence signals. The more advanced version of QDs-based silica nanoparticles containing multishell QDs is prepared without significant loss of quantum yield during surface modification.

  3. Back Cover

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    1. Gold Nanoparticles: Fluorescence of Colloidal Gold Nanoparticles is Controlled by the Surface Adsorbate (Adv. Funct. Mater. 9/2012) (page 1989)

      Ewa M. Goldys and Mushtaq A. Sobhan

      Article first published online: 2 MAY 2012 | DOI: 10.1002/adfm.201290055

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      The image shows three gold nanoparticles with varying levels of surface adsorbate (shown as brown patches on nanoparticle surface) but that are otherwise identical. Both the excitation and emission spectra shift as a result; this is indicated by varying colors of exciting laser beams and simultaneously varying colors of nanoparticle fluorescence. The article by Ewa M. Goldys and Mushtaq A. Sobhan on page 1906 explains the microscopic mechanism behind this observation.

  4. Masthead

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    1. Masthead: (Adv. Funct. Mater. 9/2012)

      Article first published online: 2 MAY 2012 | DOI: 10.1002/adfm.201290056

  5. Contents

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    1. Contents: (Adv. Funct. Mater. 9/2012) (pages 1775–1781)

      Article first published online: 2 MAY 2012 | DOI: 10.1002/adfm.201290051

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    1. Hydrogen Incorporation in III-N-V Semiconductors: From Macroscopic to Nanometer Control of the Materials’ Physical Properties (pages 1782–1801)

      Rinaldo Trotta, Antonio Polimeni and Mario Capizzi

      Article first published online: 16 MAR 2012 | DOI: 10.1002/adfm.201102053

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      The remarkable consequences of hydrogen irradiation on the electronic, structural, optical, and electrical properties of GaAsN are exploited to specifically create artificial heterostructures for different applications. The highly trapping-limited diffusion of H atoms in dilute nitrides allows for the modulation of the material properties in the growth plane, thus allowing for fabrication of site-controlled quantum dots, engineering of the strain field, and patterning of the electrical resistance.

  7. Full Papers

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    1. N,7,7-Tricyanoquinomethanimine (TCQMI) Based Organic Magnetic Materials (pages 1802–1811)

      Jordan L. Arthur, Saul H. Lapidus, Curtis E. Moore, Arnold L. Rheingold, Peter W. Stephens and Joel S. Miller

      Article first published online: 14 MAR 2012 | DOI: 10.1002/adfm.201101937

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      A new family of organic magnets with N,7, 7-tricyanoquinomethanimine (TCQMI) is reported. [FeIII(C5Me5)2]•+[TCQMI]•− forms parallel chains of alternating radical cations/anions and orders at 3.4 K as a weak ferromagnet. Amorphous M[TCQMI]2z CH2Cl2 (M = V, Fe) have μ4-[TCQMI]•−, and the Fe compound is a weak ferromagnet at ≈4 K, whereas the V compound does not magnetically order.

    2. Noise-Assisted Crystallization of Opal Films (pages 1812–1821)

      Worawut Khunsin, Andreas Amann, Gudrun Kocher-Oberlehner, Sergei G. Romanov, Saroj Pullteap, Han Cheng Seat, Eoin P. O'Reilly, Rudolf Zentel and Clivia M. Sotomayor Torres

      Article first published online: 9 FEB 2012 | DOI: 10.1002/adfm.201102605

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      A tenfold improvement of the in-plane lattice ordering in opal films is achieved using the non-equilibrium self-assembly of colloidal suspension under agitation by noise vibrations. A new and robust quantitative method of surface lattice ordering characterization is applied and results are compared with the optical diffraction at high-index crystal planes.

    3. Thermomagnetic Properties Improved by Self-Organized Flower-Like Phase Separation of Ferromagnetic Co2Dy0.5Mn0.5Sn (pages 1822–1826)

      Michael Schwall, Leslie M. Schoop, Siham Ouardi, Benjamin Balke, Claudia Felser, Peter Klaer and Hans-Joachim Elmers

      Article first published online: 22 FEB 2012 | DOI: 10.1002/adfm.201102792

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      A thermodynamically stable phase separation of Co2Dy0.5Mn0.5Sn into the Heusler compound Co2MnSn and Co8Dy3Sn4 is induced by rapid cooling from the liquid phase. The phase separation forms an ordered flower-like structure on the microscale. The increased scattering of phonons at the phase boundaries reduces the thermal conductivity and thus improves thermoelectric and spincaloric properties.

    4. Reversible Switch Memory Effect in Hydrogen-Terminated Ultrananocrystalline Diamond (pages 1827–1834)

      Moshe Tordjman, Asaf Bolker, Cecile Saguy, Emanuel Baskin, Paola Bruno, Dieter M. Gruen and Rafi Kalish

      Article first published online: 10 FEB 2012 | DOI: 10.1002/adfm.201102193

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      Reversible bistable current with a switching effect of the electron field emission from surface transfer doped ultra-nanocrystalline diamond thin films is reported. This switching is manifested by abrupt jumps in the current emission at specific extracting electric field values. Persistent hysteresis is exhibited whenever the field is ramped down. This finding may lead the way to novel memory switch devices with unprecedented performance.

    5. Facilitation of Gene Transfection and Cell Adhesion by Gelatin-Functionalized PCL Film Surfaces (pages 1835–1842)

      Wei Yuan, Chunyan Li, Chen Zhao, Chenguang Sui, Wan-Tai Yang, Fu-Jian Xu and Jie Ma

      Article first published online: 8 FEB 2012 | DOI: 10.1002/adfm.201102221

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      Efficient local gene transfection on a tissue scaffold is of crucial importance in facilitating tissue repair and regeneration. The gelatin-functionalized polycaprolactone (PCL) film surfaces are prepared via surface-initiated atom transfer radical polymerization (ATRP) of glycidyl methacrylate (GMA), which could enhance the cell-adhesion and local gene transfection properties. With the pre- and post-loading sandwich-like gene transfection, the gelatin-functionalized PCL film surface can substantially enhance the transfection properties to different cell lines.

    6. Ultrasensitive, Biocompatible, Quantum-Dot-Embedded Silica Nanoparticles for Bioimaging (pages 1843–1849)

      Bong-Hyun Jun, Do Won Hwang, Heung Su Jung, Jaeho Jang, Hyunsoo Kim, Homan Kang, Taegyu Kang, San Kyeong, Hyeokjae Lee, Dae Hong Jeong, Keon Wook Kang, Hyewon Youn, Dong Soo Lee and Yoon-Sik Lee

      Article first published online: 17 FEB 2012 | DOI: 10.1002/adfm.201102930

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      Very bright quantum dot (QD)-based probes consisting of QDs on 120 nm silica nanoparticles with silica shells are investigated for effective bioimaging. Silica-coated, QD-embedded silica nanoparticles exhibit approximately 200-times stronger photoluminescence (PL) than single QDs. The more advanced version of QD-based silica nanoparticles containing multishell QDs can detect as few as 400 units of nanoparticle-internalized cells in a cell-implanted mouse model.

    7. Synthesis of Phase-Pure Ferromagnetic Fe3P Films from Single-Source Molecular Precursors (pages 1850–1855)

      Adam C. Colson, Chih-Wei Chen, Emilia Morosan and Kenton H. Whitmire

      Article first published online: 14 FEB 2012 | DOI: 10.1002/adfm.201102386

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      Ferromagnetic Fe3P films are readily deposited on quartz substrates at 400 °C using the single-source molecular precursors H2Fe3(CO)9PR (R = tBu or Ph) in a simple, low-pressure metal-organic chemical vapor deposition (MOCVD) apparatus. The films exhibit exceptional phase purity and the structural, spectroscopic, and magnetic data obtained from the films agree well with data obtained from pure bulk Fe3P.

    8. Influence of Thiol Self-Assembled Monolayer Processing on Bottom-Contact Thin-Film Transistors Based on n-Type Organic Semiconductors (pages 1856–1869)

      Jangdae Youn, Geetha R. Dholakia, Hui Huang, Jonnathan W. Hennek, Antonio Facchetti and Tobin J. Marks

      Article first published online: 20 FEB 2012 | DOI: 10.1002/adfm.201102312

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      The growth orientation of semiconductor molecules at a gold/self-assembled monolayer (SAM)/semiconductor interface preserves the molecular long axis orientation along the substrate normal, in contrast to a bare gold/semiconductor interface. As a result, the film microstructure is well-organized for charge transport in the interfacial region.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
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    5. Masthead
    6. Contents
    7. Feature Article
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    1. Biomaterials: Biofunctional Silk/Neuron Interfaces (Adv. Funct. Mater. 9/2012) (page 1870)

      Valentina Benfenati, Katja Stahl, Carolina Gomis-Perez, Stefano Toffanin, Anna Sagnella, Reidun Torp, David L. Kaplan, Giampiero Ruani, Fiorenzo G. Omenetto, Roberto Zamboni and Michele Muccini

      Article first published online: 2 MAY 2012 | DOI: 10.1002/adfm.201290052

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      On page 1871 Valentina Benfenati, Michele Muccini, and co-workers demonstrate that silk films act as biofunctional interfaces that support the adherence, neurite outgrowth, and intercellular communication of neurons. Silk films have huge potential for use in electronic devices aimed at stimulating neural network activity and peripheral nerve repair. The image depicts a synaptic process occurring on silk fibroin films from Bombyx mori cocoon.

  9. Full Papers

    1. Top of page
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    1. Biofunctional Silk/Neuron Interfaces (pages 1871–1884)

      Valentina Benfenati, Katja Stahl, Carolina Gomis-Perez, Stefano Toffanin, Anna Sagnella, Reidun Torp, David L. Kaplan, Giampiero Ruani, Fiorenzo G. Omenetto, Roberto Zamboni and Michele Muccini

      Article first published online: 20 FEB 2012 | DOI: 10.1002/adfm.201102310

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      Silk fibroin (SF) is a natural biomaterial with huge potential for use as a biofunctional interface in electronic devices that aim to stimulate and control neural network activity and peripheral nerve repair. SF films support the adherence and growth of peripheral sensory neurons, preserve neuronal functionalities, and can be funtionalized with trophic factors to promote neurite outgrowth.

    2. Utilization of All Hydrothermally Synthesized Red, Green, Blue Nanophosphors for Fabrication of Highly Transparent Monochromatic and Full-Color Plasma Display Devices (pages 1885–1893)

      Woo-Seuk Song, Ki-Heon Lee, Young Rag Do and Heesun Yang

      Article first published online: 10 FEB 2012 | DOI: 10.1002/adfm.201102545

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      Using hydrothermally synthesized red Y(V0.5,P0.5)O4:Eu, blue Y(V0.5,P0.5)O4:Tm, and green LaPO4:Ce,Tb nanophosphors highly transparent emissive layers are screen-printed. Monochromatic test panels of transparent plasma display are fabricated by the simple combination of the rear plate (nanophosphor/glass) with the front plate of the current ac-plasma display panels and a white luminescent full-color transparent panel is demonstrated.

    3. Rapid Characterization of Ultrathin Layers of Chalcogenides on SiO2/Si Substrates (pages 1894–1905)

      Dattatray J. Late, Bin Liu, H. S. S. Ramakrishna Matte, C. N. R. Rao and Vinayak P. Dravid

      Article first published online: 16 FEB 2012 | DOI: 10.1002/adfm.201102913

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      Preparation, isolation, and rapid unambiguous characterization of large size ultrathin layers of MoS2, GaS, and GaSe onto SiO2/Si substrates is reported. The optical contrast of these thin layers is correlated with atomic force microscopy (AFM), Raman spectroscopy, and Raman imaging to determine the exact thickness and to calculate number of atomic layers present in the thin flakes/sheets in a fast, non-destructive, and unambiguous manner.

    4. Fluorescence of Colloidal Gold Nanoparticles is Controlled by the Surface Adsorbate (pages 1906–1913)

      Ewa M. Goldys and Mushtaq A. Sobhan

      Article first published online: 17 FEB 2012 | DOI: 10.1002/adfm.201102057

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      The fluorescence emission/excitation energies of gold nanoparticles of various types are shown to follow variations in the electrostatic potential at their surface. The fluorescence shifts, the evolution of zeta potentials, and the fluorescence intensity trends are explained by a model of the principal fluorescence transitions that takes into account the nanoparticle surface ligands.

    5. One-Step Formulation of Protein Microparticles with Tailored Properties: Hard Templating at Soft Conditions (pages 1914–1922)

      Dmitry V. Volodkin, Stephan Schmidt, Paulo Fernandes, Natalia I. Larionova, Gleb B. Sukhorukov, Claus Duschl, Helmuth Möhwald and Regine von Klitzing

      Article first published online: 8 FEB 2012 | DOI: 10.1002/adfm.201103007

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      Monodisperse microparticles with adjustable diameter composed from pure protein (insulin or catalase) are prepared under gentle conditions by hard-templating on porous decomposable CaCO3 microtemplates via isoelectric precipitation followed by pH- or EDTA-mediated template removal. The mechanism of the particle formation, mechanical properties, protein release, and potential for drug delivery applications are addressed.

    6. Extruded Saloplastic Polyelectrolyte Complexes (pages 1923–1931)

      Rabih F. Shamoun, Andreas Reisch and Joseph B. Schlenoff

      Article first published online: 13 FEB 2012 | DOI: 10.1002/adfm.201102787

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      Large, dense shapes of nanoblended polyelectrolyte complex are produced for the first time. Properties and processing are influenced by the salt concentration of solutions to which the complexes are exposed. A macroscopic tube, of dimensions similar to blood vessels, is an example of the new morphologies accessible.

    7. Stimuli-Free Reversible and Controllable Loading and Release of Proteins under Physiological Conditions by Exponentially Growing Nanoporous Multilayered Structure (pages 1932–1939)

      Weiyong Yuan, Zhisong Lu, Huili Wang and Chang Ming Li

      Article first published online: 8 FEB 2012 | DOI: 10.1002/adfm.201102308

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      A novel nanoporous multilayered poly(ethyleneimine) PEI/alginate film is fabricated by exponentially growing, layer-by-layer self-assembly to serve as a carrier for protein loading and release. It is demonstrated to be the first artificial system reported with the capability of stimuli-free reversible loading and release of proteins under physiological conditions and thus has great potential for various biomedical applications.

    8. Self-Assembled Complexes of Horseradish Peroxidase with Magnetic Nanoparticles Showing Enhanced Peroxidase Activity (pages 1940–1951)

      Stéphane C. Corgié, Patarawan Kahawong, Xiaonan Duan, Daniel Bowser, Joseph B. Edward, Larry P. Walker and Emmanuel P. Giannelis

      Article first published online: 15 FEB 2012 | DOI: 10.1002/adfm.201102398

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      Self-assembled bio-nanocatalysts (BNCs) of magnetite and horseradish peroxidase demonstrate novel catalytic properties depending on the magnetic nanoparticles used (size, magnetism, surface area). The new properties can be attributed to magnetic field effects at the nanoscale and the mesoporous properties of the assemblies on the reaction schemes of enzymes. BNCs offer new opportunities to expand the use of peroxidase-related enzymes for industrial bioprocesses.

    9. The Performance of Small-Pore Microporous Aluminophosphates in Low-Temperature Solar Energy Storage: The Structure–Property Relationship (pages 1952–1957)

      Alenka Ristić, Nataša Zabukovec Logar, Stefan K. Henninger and Venčeslav Kaučič

      Article first published online: 15 FEB 2012 | DOI: 10.1002/adfm.201102734

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      A model that predicts the heat storage potential of numerous known or new microporous aluminophosphates is proposed based on a comparative thermogravimetric and calorimetric study of three known structures. The formation of highly ordered water clusters in the pores is determined to be a driving force for sudden water uptake in a narrow relative pressure range.

    10. Understanding Chemical Expansion in Non-Stoichiometric Oxides: Ceria and Zirconia Case Studies (pages 1958–1965)

      Dario Marrocchelli, Sean R. Bishop, Harry L. Tuller and Bilge Yildiz

      Article first published online: 16 FEB 2012 | DOI: 10.1002/adfm.201102648

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      Formation of an oxygen vacancy (leading to a lattice contraction) with simultaneous cation radius increase (leading to a lattice expansion), which is investigated by atomic scale computational and empirical modeling, results in a chemical expansion of a non-stoichiometric oxide. Material compositions with minimal coefficient of chemical expansion, avoiding mechanical instabilities in high temperature applications, are predicted.

    11. Facile Synthesis of Monodisperse Mesoporous Zirconium Titanium Oxide Microspheres with Varying Compositions and High Surface Areas for Heavy Metal Ion Sequestration (pages 1966–1971)

      Dehong Chen, Lu Cao, Tracey L. Hanley and Rachel A. Caruso

      Article first published online: 16 FEB 2012 | DOI: 10.1002/adfm.201102878

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      Monodisperse mesoporous zirconium titanium oxide microspheres with varying compositions, high surface areas, and well-interconnected mesopores are successfully synthesized via a combined sol–gel self-assembly and solvothermal process. The resulting microspheres show potential for heavy metal ion sequestration from aqueous solution.

    12. Suppression of Catastrophic Failure in Metallic Glass–Polyisoprene Nanolaminate Containing Nanopillars (pages 1972–1980)

      Ju-Young Kim, Xun Gu, Matt Wraith, Jonathan T. Uhl, Karin A. Dahmen and Julia R. Greer

      Article first published online: 15 FEB 2012 | DOI: 10.1002/adfm.201103050

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      Nanolaminates with alternating layers of Cu50Zr50 metallic glasses (MG) and polyisoprene are synthesized and nanolaminate-containing nanopillars are fabricated. Compared with monolithic metallic glasses and MG-metal nanolaminates, these novel materials exhibit >30% enhancement in deformability without sacrifice in strength, with a concurrent suppressed stochastic signature.

    13. Synthesis of Potassium-Modified Graphene and Its Application in Nitrite-Selective Sensing (pages 1981–1988)

      Xiao-Rong Li, Fen-Ying Kong, Jing Liu, Tong-Ming Liang, Jing-Juan Xu and Hong-Yuan Chen

      Article first published online: 20 FEB 2012 | DOI: 10.1002/adfm.201103025

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      A facile and mild strategy to synthesize K-modified graphene using the room-temperature chemical modification of K in the graphene is demonstrated. The as-prepared K-modified graphene, used as an advanced electrode material, exhibits excellent electrocatalytic activity toward the oxidation of NO2 and is successfully applied in the determination of NO2 in vitro and from cancer cells.

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