Advanced Functional Materials

Cover image for Vol. 24 Issue 13

April 2, 2014

Volume 24, Issue 13

Pages 1813–1955

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      Porous Fibers: Spinning Angora Rabbit Wool-Like Porous Fibers from a Non-Equilibrated Gelatin/Water/2-Propanol Mixture (Adv. Funct. Mater. 13/2014) (page 1813)

      Philipp R. Stoessel, Robert N. Grass, Antoni Sánchez-Ferrer, Roland Fuhrer, Thomas Schweizer, Raffaele Mezzenga and Wendelin J. Stark

      Version of Record online: 1 APR 2014 | DOI: 10.1002/adfm.201470080

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      The luxury angora rabbit fiber stands out from other animal hair. Its porous structure combines exceptional insulation and comfortable wear. On page 1831, W. J. Stark and co-workers present a method by which a structurally equivalent protein filament can be synthesized in a continuous process. Raw material slaughterhouse waste-derived gelatin is utilized, adding value to this low-cost biopolymer.

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      Supercapacitors: Integrated Photo-supercapacitor Based on Bi-polar TiO2 Nanotube Arrays with Selective One-Side Plasma-Assisted Hydrogenation (Adv. Funct. Mater. 13/2014) (page 1814)

      Jing Xu, Hui Wu, Linfeng Lu, Siu-Fung Leung, Di Chen, Xiaoyuan Chen, Zhiyong Fan, Guozhen Shen and Dongdong Li

      Version of Record online: 1 APR 2014 | DOI: 10.1002/adfm.201470081

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      Many attempts have been made to integrate energy conversion and storage devices into individual units for highly efficient, light-weight, portable devices. On page 1840, G. Shen, D. Li, and co-workers present a stack-integrated photo-supercapacitor thin-film device, which comprises a dye-sensitized solar cell and a supercapacitor (SC) built on bipolar TiO2 nanotube arrays. In addition, selective plasma-assisted hydrogenation treatment of the SC electrodes delivers enhanced SC performance and overall photoelectric conversion and storage efficiency.

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      Organic Electronics: Graphene-Conducting Polymer Hybrid Transparent Electrodes for Efficient Organic Optoelectronic Devices (Adv. Funct. Mater. 13/2014) (page 1960)

      Byoung Hoon Lee, Jong-Hoon Lee, Yung Ho Kahng, Nara Kim, Yong Jae Kim, Jongjin Lee, Takhee Lee and Kwanghee Lee

      Version of Record online: 1 APR 2014 | DOI: 10.1002/adfm.201470086

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      Y. H. Kahng, K. Lee, and co-workers demonstrate a high-performance, flexible, and transparent electrode for organic optoelectronic devices based on graphene. On page 1847, a popular conducting polymer (PEDOT:PSS) is used as a supporting layer during graphene transfer and as a stable doping layer in the applied devices. High performance, reproducibility, and an enhanced lifetime are demonstrated with the developed electrode in various organic optoelectronic devices.

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      Masthead: (Adv. Funct. Mater. 13/2014)

      Version of Record online: 1 APR 2014 | DOI: 10.1002/adfm.201470085

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  6. Frontispiece

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      Ir Detectors: Ultrahigh Infrared Photoresponse from Core–Shell Single-Domain-VO2/V2O5 Heterostructure in Nanobeam (Adv. Funct. Mater. 13/2014) (page 1820)

      Zejun Li, Zhenpeng Hu, Jing Peng, Changzheng Wu, Yuchen Yang, Feng Feng, Peng Gao, Jinlong Yang and Yi Xie

      Version of Record online: 1 APR 2014 | DOI: 10.1002/adfm.201470083

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      The first oxide-catalogue photoconductive NIR detector is built by C. Z. Wu, Y. Xie, and co-workers using core/shell nanobeam heterostructures with single-domain monoclinic VO2 cores and V2O5 shells. The detectors have a well-defined interface, forming a type II heterojunction, which promotes efficient dissociation of the infrared light-induced excitons. An ultrahigh responsivity of 2873.7 A/W and specific detectivity of 9.23×1012 Jones are obtained at room temperature: the best performance of a reported IR detector based on a heavy-metalfree material.

  7. Full Papers

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    1. Ultrahigh Infrared Photoresponse from Core–Shell Single-Domain-VO2/V2O5 Heterostructure in Nanobeam (pages 1821–1830)

      Zejun Li, Zhenpeng Hu, Jing Peng, Changzheng Wu, Yuchen Yang, Feng Feng, Peng Gao, Jinlong Yang and Yi Xie

      Version of Record online: 18 NOV 2013 | DOI: 10.1002/adfm.201302967

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      First oxide-catalogue photoconductive NIR detector built by the inner single-domain monoclinic VO2 (M) core and outer V2O5 shell is put forward, which accomplished an ultrahigh responsivity (Rλ) of 2873.7 A W-1 and specific detectivity (D*) of 9.23 × 1012 Jones at room temperature (at 990 nm; 0.2 mW cm-2), recording the best performance compared with those reported IR detectors based on heavy-metal-free materials.

    2. Spinning Angora Rabbit Wool-Like Porous Fibers from a Non-Equilibrated Gelatin/Water/2-Propanol Mixture (pages 1831–1839)

      Philipp R. Stoessel, Robert N. Grass, Antoni Sánchez-Ferrer, Roland Fuhrer, Thomas Schweizer, Raffaele Mezzenga and Wendelin J. Stark

      Version of Record online: 27 NOV 2013 | DOI: 10.1002/adfm.201303321

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      The continuous spinning of angora rabbit wool-like fibers from a non-equilibrated gelatin/water/2-propanol mixture using the presented process allows the production of protein fibers with simultaneous high porosity and promising mechanical properties.

    3. Integrated Photo-supercapacitor Based on Bi-polar TiO2 Nanotube Arrays with Selective One-Side Plasma-Assisted Hydrogenation (pages 1840–1846)

      Jing Xu, Hui Wu, Linfeng Lu, Siu-Fung Leung, Di Chen, Xiaoyuan Chen, Zhiyong Fan, Guozhen Shen and Dongdong Li

      Version of Record online: 18 NOV 2013 | DOI: 10.1002/adfm.201303042

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      A novel stack-integrated photo-supercapacitor (PSC) thin-film device is composed of a dye-sensitized solar cell and a supercapacitor built on bi-polar anodic titanium oxide nanotube arrays. Improved supercapacitor performance is achieved through selective plasma-assisted hydrogenation treatment. A remarkable overall photoelectric conversion and storage efficiency up to 1.64% is achieved with a fast response and superior cycling capability.

    4. Graphene-Conducting Polymer Hybrid Transparent Electrodes for Efficient Organic Optoelectronic Devices (pages 1847–1856)

      Byoung Hoon Lee, Jong-Hoon Lee, Yung Ho Kahng, Nara Kim, Yong Jae Kim, Jongjin Lee, Takhee Lee and Kwanghee Lee

      Version of Record online: 27 NOV 2013 | DOI: 10.1002/adfm.201302928

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      Graphene-conducting polymer hybrid electrode is demonstrated by employing a popular conducting polymer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), as a new supporting and doping layer for the transfer of GR films. Because the transfer method simplifies the transfer process and solves the residue problem of conventional transfer methods, the new GR/PEDOT:PSS hybrid electrodes are fully functional in organic electronic devices, outperforming the conventionally transferred GR electrodes and indium tin oxide electrodes.

    5. Constrained Order in Nanoporous Alumina with High Aspect Ratio: Smart Combination of Interference Lithography and Hard Anodization (pages 1857–1863)

      Josep M. Montero Moreno, Martin Waleczek, Stephan Martens, Robert Zierold, Detlef Görlitz, Victor Vega Martínez, Victor M. Prida and Kornelius Nielsch

      Version of Record online: 20 NOV 2013 | DOI: 10.1002/adfm.201303268

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      Using the phenomenon of light interference, periodic patterns are easily created on the surface of aluminum. These can guide the pores nucleation during the porous anodization. The resulting membranes show the ideal hexagonal array of pores over a large area. By matching the parameters of the lithographic technique and the electrochemical oxidation, a broad window of interpore distances is feasible.

    6. Graphene as an Electron Shuttle for Silver Deoxidation: Removing a Key Barrier to Plasmonics and Metamaterials for SERS in the Visible (pages 1864–1878)

      Maria Losurdo, Iris Bergmair, Babak Dastmalchi, Tong-Ho Kim, Maria M. Giangregroio, Wenyuan Jiao, Giuseppe V. Bianco, April S. Brown, Kurt Hingerl and Giovanni Bruno

      Version of Record online: 19 NOV 2013 | DOI: 10.1002/adfm.201303135

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      The role of graphene in enabling deoxidation of silver nanostructures, thereby contributing to enhance plasmonic properties and to improve the temporal stability of graphene/silver hybrids for both general plasmonic and meta-materials applications as well as for surface enhanced Raman scattering (SERS) substrates, is demonstrated.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Frontispiece
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      Contrast Agents: Magnetically Decorated Multiwalled Carbon Nanotubes as Dual MRI and SPECT Contrast Agents (Adv. Funct. Mater. 13/2014) (page 1879)

      Julie Tzu-Wen Wang, Laura Cabana, Maxime Bourgognon, Houmam Kafa, Andrea Protti, Kerrie Venner, Ajay M. Shah, Jane K. Sosabowski, Stephen J. Mather, Anna Roig, Xiaoxing Ke, Gustaaf Van Tendeloo, Rafael T. M. de Rosales, Gerard Tobias and Khuloud T. Al-Jamal

      Version of Record online: 1 APR 2014 | DOI: 10.1002/adfm.201470084

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      Multiwalled carbon nanotubes (CNTs) are cylinder-structured nanomaterials composed of rolled-up graphene sheets. G. Tobias, K. T. Al-Jamal, and co-workers carefully decorated CNTs with superparamagnetic iron oxide nanoparticles capable of magnetic resonance imaging, and subsequently tagged them with a nuclear imaging probe via a bisphosphonate linker. The hybrid successfully bridges two clinically important imaging techniques—magnetic resonance and nuclear imaging—thus combining the high resolution and sensitivity offered by each technique.

  9. Full Papers

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    1. Magnetically Decorated Multiwalled Carbon Nanotubes as Dual MRI and SPECT Contrast Agents (pages 1880–1894)

      Julie Tzu-Wen Wang, Laura Cabana, Maxime Bourgognon, Houmam Kafa, Andrea Protti, Kerrie Venner, Ajay M. Shah, Jane K. Sosabowski, Stephen J. Mather, Anna Roig, Xiaoxing Ke, Gustaaf Van Tendeloo, Rafael T. M. de Rosales, Gerard Tobias and Khuloud T. Al-Jamal

      Version of Record online: 19 NOV 2013 | DOI: 10.1002/adfm.201302892

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      Dual single photon emission computed tomography (SPECT) and magnetic resonance (MR) imaging of superparamagnetic iron oxide nanoparticle (SPION)–multiwalled carbon nanotube (MWNT) hybrid phantoms. Fe2O3–MWNT hybrids are dispersed in 1% Pluronic F-127 solution and imaged by MR or SPECT/CT.

    2. Adopting the Principles of Collagen Biomineralization for Intrafibrillar Infiltration of Yttria-Stabilized Zirconia into Three-Dimensional Collagen Scaffolds (pages 1895–1903)

      Bin Zhou, Li-na Niu, Wei Shi, Wei Zhang, Dwayne D. Arola, Lorenzo Breschi, Jing Mao, Ji-hua Chen, David H. Pashley and Franklin R. Tay

      Version of Record online: 18 NOV 2013 | DOI: 10.1002/adfm.201302920

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      Acac-stablized yttria-stabilized zirconia (YSZ) nano-sized precursors infuse into the fibril and coalesce in the presence of the PAH-crosslinked collagen molecules to form larger-sized precursor droplets. These precursor droplets further condense in the presence of water available within the intrafibrillar compartments of the collagen fibril into amorphous YSZ nanoparticles.

    3. High-Performance Hybrid Solar Cell Made from CdSe/CdTe Nanocrystals Supported on Reduced Graphene Oxide and PCDTBT (pages 1904–1910)

      Shi Wun Tong, Nimai Mishra, Chen Liang Su, Venkatram Nalla, Wenya Wu, Wei Ji, Jie Zhang, Yinthai Chan and Kian Ping Loh

      Version of Record online: 19 NOV 2013 | DOI: 10.1002/adfm.201303010

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      A chemically mediated way of controlling nanoscale morphologies in a composite is demonstrated by immobilizing CdSe/CdTe nanocrystals on oleylamine-functionalized reduced graphene oxide (rGO) sheets. The tetrapod-rGO can be homogeneously mixed with an organic dye (PCDTBT) to form donor–acceptor dispersed heterojunctions and exhibit a high power-conversion efficiency of ∼3.3% in a solar cell device.

    4. Bright Blue and White Electrophosphorescent Triarylboryl-Functionalized C^N-Chelate Pt(II) Compounds: Impact of Intramolecular Hydrogen Bonds and Ancillary Ligands (pages 1911–1927)

      Xiang Wang, Yi-Lu Chang, Jia-Sheng Lu, T. Zhang, Zheng-Hong Lu and Suning Wang

      Version of Record online: 4 DEC 2013 | DOI: 10.1002/adfm.201302871

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      Bright blue and white phosphorescent dimesitylboryl-functionalized phenyl-1,2,3-triazolyl C^N-chelate Pt(II) compounds with phosphorescent quantum yield as high as 0.97 are achieved. Intramolecular hydrogen bonds, substituents, and ancillary ligands are found to greatly influence phosphorescence efficiency and excimer emission. Single-dopant white light electrophosphorescent devices with external quantum efficiency = 15.6% are fabricated.

    5. Room Temperature Fluorescent Conjugated Polymer Gums (pages 1928–1937)

      Young-Jae Jin, Jung-Eun Bae, Kwang-Soo Cho, Wang-Eun Lee, Dong-Yeon Hwang and Giseop Kwak

      Version of Record online: 14 OCT 2013 | DOI: 10.1002/adfm.201302829

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      Long alkyl chain-coupled PDPA derivatives provide quite soft and sticky gums at room temperature to produce films with very smooth surfaces after manual kneading and pressing. The fluorescence emission is quite intense in both the film and solution. The elastomer-supported film accommodates the large strain without cracking and delamination, after stretching and relaxing several hundred times.

    6. Film-Based Implants for Supporting Neuron–Electrode Integrated Interfaces for The Brain (pages 1938–1948)

      Min D. Tang-Schomer, Xiao Hu, Marie Hronik-Tupaj, Lee W. Tien, Michael J. Whalen, Fiorenzo G. Omenetto and David L. Kaplan

      Version of Record online: 18 NOV 2013 | DOI: 10.1002/adfm.201303196

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      Neuron-electrode interfaces are developed on thin silk films as brain implants. Silk films can use surface topography to induce astrocyte alignment, and microfluidic systems to generate patterned axon tracts. With built-in wire connections in the film, cortical neurons produce robust calcium responses upon electrical stimulation. These brain-compatible implants could potentially provide sustained functional neuron-electrode interfaces for the brain.

    7. Efficient Si Nanowire Array Transfer via Bi-Layer Structure Formation Through Metal-Assisted Chemical Etching (pages 1949–1955)

      Taeho Moon, Lin Chen, Shinhyun Choi, Chunjoong Kim and Wei Lu

      Version of Record online: 20 NOV 2013 | DOI: 10.1002/adfm.201303180

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      A facile method is demonstrated to produce bilayer Si nanowire structures with horizontal cracks during metal-assisted chemical etching, allowing the efficient transfer of Si nanowire arrays on diverse substrates. A mass-transport model is developed to explain the natural bilayer structure formation mechanism. Repeated etch and transfer from a single Si wafer is demonstrated for large-scale Si-nanowire device fabrication.

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