Advanced Materials

Cover image for Advanced Materials

February 21, 2012

Volume 24, Issue 8

Pages 993–1132

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Food Sensors: Silk-Based Conformal, Adhesive, Edible Food Sensors (Adv. Mater. 8/2012) (page 993)

      Hu Tao, Mark A. Brenckle, Miaomiao Yang, Jingdi Zhang, Mengkun Liu, Sean M. Siebert, Richard D. Averitt, Manu S. Mannoor, Michael C. McAlpine, John A. Rogers, David L. Kaplan and Fiorenzo G. Omenetto

      Version of Record online: 14 FEB 2012 | DOI: 10.1002/adma.201290036

      Thumbnail image of graphical abstract

      An array of passive Au antennae (whose magnified image is shown in the background) fabricated on an all-protein-based silk substrate were conformally transferred and adhered to the surface of an egg by F. G. Omenetto and co-workers. The process allows for intimate contact of micro- and nanostructures that can probe their surrounding environment, and accordingly provides the opportunity for in-situ monitoring of food quality. This type of device is composed entirely of edible and biodegradable components, making it well suited for interfaces with biological matter. For more details, see page 1067.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Biomimetics: Looking Beyond Fibrillar Features to Scale Gecko-Like Adhesion (Adv. Mater. 8/2012) (page 994)

      Michael D. Bartlett, Andrew B. Croll, Daniel R. King, Beth M. Paret, Duncan J. Irschick and Alfred J. Crosby

      Version of Record online: 14 FEB 2012 | DOI: 10.1002/adma.201290037

      Thumbnail image of graphical abstract

      Gecko-inspired reversible adhesive materials with unprecedented force capacities are described by D. Irschick, A. Crosby, and co-workers on page 1078. A simple scaling parameter, which describes both natural and synthetic reversible adhesive systems, leads to the development of unpatterned synthetic adhesive materials. Adhesive force capacities as high as 2950 N are achieved, not with fibrillar features, but through an integrated design with inextensible, draping fabrics, inspired by the skin-tendon morphologies found in the tokay gecko. The image presents an arm of a tokay gecko in front of a draping fabric.

  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Highly Photoactive, Low Bandgap TiO2 Nanoparticles Wrapped by Graphene (Adv. Mater. 8/2012) (page 1133)

      Joon Seok Lee, Kyeong Hwan You and Chan Beum Park

      Version of Record online: 14 FEB 2012 | DOI: 10.1002/adma.201290038

  4. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Masthead: (Adv. Mater. 8/2012)

      Version of Record online: 14 FEB 2012 | DOI: 10.1002/adma.201290039

  5. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
  6. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Spray-Assisted Polyelectrolyte Multilayer Buildup: from Step-by-Step to Single-Step Polyelectrolyte Film Constructions (pages 1001–1016)

      Pierre Schaaf, Jean-Claude Voegel, Loïc Jierry and Fouzia Boulmedais

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201104227

      Thumbnail image of graphical abstract

      Design of nanometer to micrometer thin films by spraying solutions of polyelectrolyte is a recent emerging concept in the field of surface coating. Herein the origin of this new process, the fundamental issues, and the resulting potential applications relative to spray assisted deposition from the current literature are reviewed.

  7. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Atomic Layer Deposition of Nanostructured Materials for Energy and Environmental Applications (pages 1017–1032)

      Catherine Marichy, Mikhael Bechelany and Nicola Pinna

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201104129

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      Atomic layer deposition (ALD) is a thin film technology that in the past two decades rapidly developed from a niche technology to an established method. It has proven to be a key technology for the surface modification and the fabrication of complex nanostructured materials for energy and environmental applications. Figure reproduced with permission from [5].

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Nanoimprint Lithography: A Polyferroplatinyne Precursor for the Rapid Fabrication of L10-FePt-type Bit Patterned Media by Nanoimprint Lithography (Adv. Mater. 8/2012) (page 1033)

      Qingchen Dong, Guijun Li, Cheuk-Lam Ho, Mahtab Faisal, Chi-Wah Leung, Philip Wing-Tat Pong, Kun Liu, Ben-Zhong Tang, Ian Manners and Wai-Yeung Wong

      Version of Record online: 14 FEB 2012 | DOI: 10.1002/adma.201290034

      Thumbnail image of graphical abstract

      On page 1034 W.-T. Pong, I. Manners, W.-Y. Wong, and co-workers report the simple and rapid fabrication of patterned L10-FePt alloy nanoparticles from a solution-processable bimetallic polyferroplatinyne polymer precursor. This approach holds great promise for fabricating L10-FePt-type bit-patterned media using high-throughput nanoimprint lithography, followed by controlled pyrolysis of the nanopatterned polymer. Each dot in the asgenerated FePt-containing nanodot array is magnetic, which can serve as a good platform for future ultrahigh-density perpen-dicular magnetic data recording systems.

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. A Polyferroplatinyne Precursor for the Rapid Fabrication of L10-FePt-type Bit Patterned Media by Nanoimprint Lithography (pages 1034–1040)

      Qingchen Dong, Guijun Li, Cheuk-Lam Ho, Mahtab Faisal, Chi-Wah Leung, Philip Wing-Tat Pong, Kun Liu, Ben-Zhong Tang, Ian Manners and Wai-Yeung Wong

      Version of Record online: 31 JAN 2012 | DOI: 10.1002/adma.201104171

      Thumbnail image of graphical abstract

      A polyferroplatinyne polymer can be patterned on the surface of Si wafer in ordered nanoline or nanodot shapes with PDMS molds through nanoimprint lithography (NIL), and subsequent thermal treatment gives rise to the nanopatterned arrays of L10-FePt nanoparticles with the same periodicities. The method offers excellent potential to be utilized in the simple and rapid fabrication of bit patterned media for magnetic data recording.

    2. Barrier-Guided Growth of Micro- and Nano-Structured Graphene (pages 1041–1045)

      Nathaniel S. Safron, Myungwoong Kim, Padma Gopalan and Michael S. Arnold

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201104195

      Thumbnail image of graphical abstract

      A novel approach for the rational synthesis of low-defect density, patterned graphene from the bottom up, called barrier-guided chemical vapor deposition, is introduced. A patterned barrier layer impedes the growth of graphene in selected areas of the copper substrate, guiding the growth of graphene into desired micro- and nano- structures with control over placement, orientation, and spatial and lateral extent.

    3. Accurate Control of Multishelled ZnO Hollow Microspheres for Dye-Sensitized Solar Cells with High Efficiency (pages 1046–1049)

      Zhenghong Dong, Xiaoyong Lai, Jonathan E. Halpert, Nailiang Yang, Luoxin Yi, Jin Zhai, Dan Wang, Zhiyong Tang and Lei Jiang

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/adma.201104626

      Thumbnail image of graphical abstract

      A series of multishelled ZnO hollow microspheres with controlled shell number and inter-shell spacing have been successfully prepared by a simple carbonaceous microsphere templating method, whose large surface area and complex multishelled hollow structure enable them load sufficient dyes and multi-reflect the light for enhancing light harvesting and realize a high conversion efficiency of up to 5.6% when used in dye-sensitized solar cells.

    4. Nanoporous Anodic Alumina Barcodes: Toward Smart Optical Biosensors (pages 1050–1054)

      Abel Santos, Victor S. Balderrama, María Alba, Pilar Formentín, Josep Ferré-Borrull, Josep Pallarès and Lluís F. Marsal

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/adma.201104490

      Thumbnail image of graphical abstract

      Toward a Smart Optical Biosensor Based on Nanoporous Anodic Alumina (NAA): By modifying the pore geometry in nanoporous anodic alumina we are able to change the effective medium at will and tune the photoluminescence of NAA. The oscillations in the PL spectrum are converted into exclusive barcodes, which are useful for developing optical biomedical sensors in the UV-Visible region.

    5. Nanostructured, Active Organic–Metal Junctions for Highly Efficient Charge Generation and Extraction in Polymer-Fullerene Solar Cells (pages 1055–1061)

      Ajay K. Pandey, Muhsen Aljada, Marappan Velusamy, Paul L. Burn and Paul Meredith

      Version of Record online: 24 JAN 2012 | DOI: 10.1002/adma.201103896

      Thumbnail image of graphical abstract

      A facile one step method for periodic nanostructuring of organic solar cells is presented. The nanostructured metal–organic interface delivers combined enhanced light trapping and improved charge extraction leading to up to a 10% increase in power conversion efficiency of already optimized planar devices.

    6. Programmable Bipolar and Unipolar Nonvolatile Memory Devices Based on Poly(2-(N-carbazolyl)ethyl methacrylate) End-Capped with Fullerene (pages 1062–1066)

      Suk Gyu Hahm, Nam-Goo Kang, Wonsang Kwon, Kyungtae Kim, Yong-Gi Ko, Seonyoung Ahn, Beom-Goo Kang, Taihyun Chang, Jae-Suk Lee and Moonhor Ree

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201103647

      Thumbnail image of graphical abstract

      A novel polymer, poly(2-(N -carbazolyl)ethyl methacrylate) end-capped with fullerene (PCzMA-C60), has been synthesized via living anionic polymerization. Electrically programmable flash memory devices were easily fabricated with this polymer by using solution coating and metal deposition. This polymer was found in these devices to exhibit bipolar and unipolar switching behaviors with a high ON/OFF current ratio, a long retention time, high reliability, and low power consumption. The excellent properties and easy processability of this polymer open up the possibility of the mass production of high performance nonvolatile memory devices at low cost.

    7. Silk-Based Conformal, Adhesive, Edible Food Sensors (pages 1067–1072)

      Hu Tao, Mark A. Brenckle, Miaomiao Yang, Jingdi Zhang, Mengkun Liu, Sean M. Siebert, Richard D. Averitt, Manu S. Mannoor, Michael C. McAlpine, John A. Rogers, David L. Kaplan and Fiorenzo G. Omenetto

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/adma.201103814

      Thumbnail image of graphical abstract

      An array of passive metamaterial antennas fabricated on all protein-based silk substrates were conformally transferred and adhered to the surface of an apple. This process allows the opportunity for intimate contact of micro- and nanostructures that can probe, and accordingly monitor changes in, their surrounding environment. This provides in situ monitoring of food quality. It is to be noted that this type of sensor consists of all edible and biodegradable components, holding utility and potential relevance for healthcare and food/consumer products and markets.

    8. Buckling of Aligned Carbon Nanotubes as Stretchable Conductors: A New Manufacturing Strategy (pages 1073–1077)

      Yong Zhu and Feng Xu

      Version of Record online: 23 JAN 2012 | DOI: 10.1002/adma.201103382

      Thumbnail image of graphical abstract

      A new manufacturing strategy for buckling of aligned carbon nanotubes is developed, which does not involve prestretching the substrate but relies on the interface interaction between the nanotubes and the substrate. More specifically, upon stretching the substrate the nanotubes slide on the substrate, but upon releasing the nanotubes buckle. Following this manufacturing strategy, stretchable conductors based on aligned carbon nanotubes are demonstrated.

  10. Communication

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Looking Beyond Fibrillar Features to Scale Gecko-Like Adhesion (pages 1078–1083)

      Michael D. Bartlett, Andrew B. Croll, Daniel R. King, Beth M. Paret, Duncan J. Irschick and Alfred J. Crosby

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201104191

      Thumbnail image of graphical abstract

      Hand-sized gecko-inspired adhesives with reversible force capacities as high as 2950 N (29.5 N cm-2) are designed without the use of fibrillar features through a simple scaling theory. The scaling theory describes both natural and synthetic gecko-inspired adhesives, over 14 orders of magnitude in adhesive force capacity, from nanoscopic to macroscopic length scales.

  11. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. Highly Photoactive, Low Bandgap TiO2 Nanoparticles Wrapped by Graphene (pages 1084–1088)

      Joon Seok Lee, Kyeong Hwan You and Chan Beum Park

      Version of Record online: 24 JAN 2012 | DOI: 10.1002/adma.201104110

      Thumbnail image of graphical abstract

      Highly photoactive, graphene-wrapped anatase TiO2 nanoparticles are synthesized through one-step hydrothermal reduction of graphene oxide (GO) and TiO2 crystallization from GO-wrapped amorphous TiO2 NPs. Graphene-TiO2 nanoparticles exhibit a red-shift of the band-edge and a significant reduction of the bandgap (2.80 eV). Graphene-TiO2 nanoparticles possess excellent photocatalytic properties under visible light for the degradation of methylene blue.

    2. Folded Structured Graphene Paper for High Performance Electrode Materials (pages 1089–1094)

      Fei Liu, Shuyan Song, Dongfeng Xue and Hongjie Zhang

      Version of Record online: 24 JAN 2012 | DOI: 10.1002/adma.201104691

      Thumbnail image of graphical abstract

      A novel method to fabricate graphene paper with folded structured graphene sheets is described. When used as an electrode for LIBs and supercapacitors, the as-prepared graphene paper can show much higher performances compared to conventional graphene paper fabricated by a flow-directed assembly method. The unique graphene paper obtained here is promising to act as a new kind of flexible electrode for wearable or rolling-up devices.

    3. Patchiness of Embedded Particles and Film Stiffness Control Through Concentration of Gold Nanoparticles (pages 1095–1100)

      D. Kohler, N. Madaboosi, M. Delcea, S. Schmidt, B. G. De Geest, D. V. Volodkin, H. Möhwald and A. G. Skirtach

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/adma.201103958

      Thumbnail image of graphical abstract

      Patchy particles are fabricated using a method of embedding-into and extracting-from thick, biocompatible, gel-like HA/PLL films. Control over the patchiness is achieved by adjusting the stiffness of films, which affects embedding and masking of particles. The stiffness is adjusted by the concentration of gold nanoparticles adsorbed onto the surface of the films.

    4. Three-Dimensional Metallic Photonic Crystals with Optical Bandgaps (pages 1101–1105)

      Nikos Vasilantonakis, Konstantina Terzaki, Ioanna Sakellari, Vytautas Purlys, David Gray, Costas M. Soukoulis, Maria Vamvakaki, Maria Kafesaki and Maria Farsari

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201104778

      Thumbnail image of graphical abstract

      The fabrication of fully three-dimensional photonic crystals with a bandgap at optical wavelengths is demonstrated by way of direct femtosecond laser writing of an organic-inorganic hybrid material with metal-binding moieties, and selective silver coating using electroless plating. The crystals have 600-nm intralayer periodicity and sub-100 nm features, and they exhibit well-defined diffraction patterns.

    5. Direct Observations of Retention Failure in Ferroelectric Memories (pages 1106–1110)

      Peng Gao, Christopher T. Nelson, Jacob R. Jokisaari, Yi Zhang, Seung-Hyub Baek, Chung Wung Bark, Enge Wang, Yuanming Liu, Jiangyu Li, Chang-Beom Eom and Xiaoqing Pan

      Version of Record online: 14 FEB 2012 | DOI: 10.1002/adma.201103983

      Thumbnail image of graphical abstract

      Nonvolatile ferroelectric random-access memory uses ferroelectric thin films to save a polar state written by an electric field that is retained when the field is removed. After switching, the high energy of the domain walls separating regions of unlike polarization can drive backswiching resulting in a loss of switched domain volume, or in the case of very small domains, complete retention loss.

    6. Template-free Formation of Uniform Urchin-like α-FeOOH Hollow Spheres with Superior Capability for Water Treatment (pages 1111–1116)

      Bao Wang, Haobin Wu, Le Yu, Rong Xu, Teik-Thye Lim and Xiong Wen (David) Lou

      Version of Record online: 23 JAN 2012 | DOI: 10.1002/adma.201104599

      Thumbnail image of graphical abstract

      Uniform urchin-like α-FeOOH hollow spheres assembled from nanoneedles have been synthesized via a facile and green one-pot method. By simply adjusting the amount of glycerol in the reaction system, hierarchical urchin-like α-FeOOH solid spheres or hollow spheres can be obtained. When evaluated for the potential use in water treatment, it is found that the as-obtained uniform urchin-like α-FeOOH hollow spheres exhibit excellent capability for removing both organic dye and heavy metal ions in waste water.

    7. Organic Single-Crystal Arrays from Solution-Phase Growth Using Micropattern with Nucleation Control Region (pages 1117–1122)

      Osamu Goto, Shigetaka Tomiya, Yosuke Murakami, Akira Shinozaki, Akira Toda, Jiro Kasahara and Daisuke Hobara

      Version of Record online: 26 JAN 2012 | DOI: 10.1002/adma.201104373

      Thumbnail image of graphical abstract

      A method for forming organic single-crystal arrays from solution is demonstrated using an organic semiconductor, 3,9-bis(4-ethylphenyl)-peri-xanthenoxanthene (C2Ph-PXX). Supersaturation of C2Ph-PXX/tetralin solution is spatially changed by making a large difference in solvent evaporation to generate nuclei at the designated location. The method is simple to implement since it employs only a micropattern and control of the solvent vapor pressure during growth.

  12. Research News

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Review
    8. Progress Report
    9. Frontispiece
    10. Communications
    11. Communication
    12. Communications
    13. Research News
    1. CdSe Magic-Sized Nuclei, Magic-Sized Nanoclusters and Regular Nanocrystals: Monomer Effects on Nucleation and Growth (pages 1123–1132)

      Kui Yu

      Version of Record online: 24 JAN 2012 | DOI: 10.1002/adma.201104081

      Thumbnail image of graphical abstract

      The nature and degree of supersaturation (DS) of CdSe monomers plays an essential role in the formation of CdSe magic-sized nuclei (MSN), magic-sized nanoclusters (MSCs), and regular nanocrystals (RNCs) in 1-octadecene (ODE) from reactions with cadmium acetate Cd(OAc)2 as a Cd source. With low and high myristic acid to Cd(OAc)2 feed molar ratios such as 1-to-2 and 3-to-1, the resulting Cd precursors are OAc-Cd-MA and MA-Cd-MA, respectively, which play an important role in the formation of the various CdSe NCs.

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