Advanced Functional Materials

Cover image for Vol. 18 Issue 17

September 10, 2008

Volume 18, Issue 17

Pages 2463–2626

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Corrections
    7. Index
    1. Cover Picture: SERS Aptatags: New Responsive Metallic Nanostructures for Heterogeneous Protein Detection by Surface Enhanced Raman Spectroscopy (Adv. Funct. Mater. 17/2008)

      Laura Fabris, Mark Dante, Thuc-Quyen Nguyen, Jeffrey B.-H. Tok and Guillermo C. Bazan

      Version of Record online: 5 SEP 2008 | DOI: 10.1002/adfm.200890066

      Thumbnail image of graphical abstract

      On page 2518, Bazan and co-workers describe the design and function of “aptatags” that consist of aptamer-decorated silver nanoparticles brought together by an organic linker. This linkeris strategically located where surface enhancement of Raman signals takes place. The aptamer probes were chosen to selectively bind specific proteins. These structural attributes of aptatags allow the development of a new heterogeneous protein detection method.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Corrections
    7. Index
    1. Inside Front Cover: Defect Tolerance and Nanomechanics in Transistors that Use Semiconductor Nanomaterials and Ultrathin Dielectrics (Adv. Funct. Mater. 17/2008)

      Jong-Hyun Ahn, Zhengtao Zhu, Sang-Il Park, Jianliang Xiao, Yonggang Huang and John A. Rogers

      Version of Record online: 5 SEP 2008 | DOI: 10.1002/adfm.200890067

      Thumbnail image of graphical abstract

      The mechanics of solid nanostructures – ribbons, wires, membranes – can be important for their use in electronic and related systems. This colorized scanning electron microscopy image illustrates the ability of nanoribbons to span open trenches as discussed by Ahn et al. on page 2535. This behavior leads to improved electronic properties in transistors that incorporate gate dielectrics with pinhole or related defects, as shown in the inset data and schematic illustration.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Corrections
    7. Index
  4. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Corrections
    7. Index
    1. Quantitative analysis of lattice ordering in thin film opal-based photonic crystals (pages 2471–2479)

      Worawut Khunsin, Gudrun Kocher, Sergei G. Romanov and Clivia M. Sotomayor Torres

      Version of Record online: 23 JUL 2008 | DOI: 10.1002/adfm.200701431

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      Assembling colloidal crystals in a moving meniscus under random noise agitation produces opal films with the same lattice but different disorders. The lattice ordering can be quantified by the magnitudes of harmonics in the Fourier transforms of SEM images to address the in-plane lattice ordering and by rotation diagrams of the optical transmission (see figure) to address the regularity of crystal planes. In prepared opals, a strong deviation of the lattice from the face-centered cubic symmetry is demonstrated.

    2. The Influence of UV Irradiation on Ketonic Defect Emission in Fluorene-Based Copolymers (pages 2480–2488)

      Horst Scheiber, Michael Graf, Harald Plank, Egbert Zojer, Christian Slugovc, Stefan Kappaun, Frank Galbrecht, Ullrich Scherf and Emil J. W. List

      Version of Record online: 5 AUG 2008 | DOI: 10.1002/adfm.200800389

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      The recovery of blue emission in partially UV irradiated thin films of statistical poly(fluorene)-fluorenone copolymers is investigated. This effect is attributed to suppressed energy migration towards green emitting ketonic defect sites due to UV induced conjugation interruption. It is demonstrated that the observed effect can be used for the fabrication of two-color polymer light-emitting diodes (PLEDs) by selective structuring.

    3. In vivo Imaging and Drug Storage by Quantum-Dot-Conjugated Carbon Nanotubes (pages 2489–2497)

      Yan Guo, Donglu Shi, Hoonsung Cho, Zhongyun Dong, Amit Kulkarni, Giovanni M. Pauletti, Wei Wang, Jie Lian, Wen Liu, Lei Ren, Qiqing Zhang, Guokui Liu, Christopher Huth, Lumin Wang and Rodney C. Ewing

      Version of Record online: 8 AUG 2008 | DOI: 10.1002/adfm.200800406

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      Carbon nanotubes functionalized with plasma polymer coating, luminescent quantum dots, and loaded withr anticancer drugs are investigated. The functionalized CNTs can be used as biomarkers and drug carriers. Successful in vivo imaging and quantitative determination of paclitaxel drug loading are described for the first time for this novel nanoassembly.

    4. Effect of Surfactant on FRET and Quenching in DNA Sequence Detection Using Conjugated Polymers (pages 2498–2509)

      Hameed A. Al Attar and Andy P. Monkman

      Version of Record online: 5 AUG 2008 | DOI: 10.1002/adfm.200700809

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      Enhancement of both sensitivity and selectivity in DNA sequence detection using cationic conjugated polymers (CCPs) and peptide nucleic acid labeled with fluorescein (PNA-Flu*) by the addition of nonionic surfactant is revealed by steady-state and time-resolved measurements. In particular, the effect of surfactant (gray in figure) on various energy-transfer and quenching processes is investigated.

    5. Photoresponsive Glass-Forming Butadiene-Based Chiral Liquid Crystals with Circularly Polarized Photoluminescence (pages 2510–2517)

      Ratheesh K. Vijayaraghavan, Shibu Abraham, Haruhisa Akiyama, Seiichi Furumi, Nobuyuki Tamaoki and Suresh Das

      Version of Record online: 5 AUG 2008 | DOI: 10.1002/adfm.200701230

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      Inherently photoactive mesomorphic materials with a wide-range cholesteric liquid crystalline phase are demonstrated as a promising candidate for photomodulated full color data storage devices (see figure). The pitch and thereby the reflection wavelength from the cholesteric film can be tuned for the entire visible range and even in the IR region. The materials display characteristic polarized optical properties and these aspects are described as well.

    6. SERS Aptatags: New Responsive Metallic Nanostructures for Heterogeneous Protein Detection by Surface Enhanced Raman Spectroscopy (pages 2518–2525)

      Laura Fabris, Mark Dante, Thuc-Quyen Nguyen, Jeffrey B.-H. Tok and Guillermo C. Bazan

      Version of Record online: 20 AUG 2008 | DOI: 10.1002/adfm.200800301

      Thumbnail image of graphical abstract

      Aptatags comprise metal nanoparticles held together by a covalent linker that serves as an SERS reporter and surface-modified with aptamers to serve as the recognition elements. These nanomaterials are an essential component in a new surface-mediated protein recognition assay.

    7. Significantly Enhanced Photoluminescence of Doped Polymer-Metal Hybrid Nanotubes (pages 2526–2534)

      Dong Hyuk Park, Hyun Seung Kim, Mi-Yun Jeong, Yong Baek Lee, Hyun-Jun Kim, Dae-Chul Kim, Jeongyong Kim and Jinsoo Joo

      Version of Record online: 5 AUG 2008 | DOI: 10.1002/adfm.200701483

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      The LCM PL intensity of hybrid doped-P3MT/Ni nanotubes significantly increased on increasing the doping level of the P3MT. Both charge- and energy-transfer effects in surface plasmon resonance coupling contributed to a very-large enhancement of the PL efficiency of the doped-P3MT-based hybrid NTs with the nanometer scale Ni coating.

    8. Defect Tolerance and Nanomechanics in Transistors that Use Semiconductor Nanomaterials and Ultrathin Dielectrics (pages 2535–2540)

      Jong-Hyun Ahn, Zhengtao Zhu, Sang-Il Park, Jianliang Xiao, Yonggang Huang and John A. Rogers

      Version of Record online: 20 AUG 2008 | DOI: 10.1002/adfm.200800176

      Thumbnail image of graphical abstract

      Experimental and theoretical studies of the mechanics of nanoribbons and membranes of single-crystalline silicon on patterned dielectric layers reveal key aspects of this system. As a practical matter, these type of mechanics have the advantage that they reduce greatly the sensitivity of such devices to roughness and other structural imperfections in the substrate or the supported layers.

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      Analysis of Complete Organic Semiconductor Devices by Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (pages 2541–2547)

      Sebastian Scholz, Karsten Walzer and Karl Leo

      Version of Record online: 20 AUG 2008 | DOI: 10.1002/adfm.200700816

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      Analysis of chemical reaction products in organic light-emitting devices by the use of the laser desorption/ionization time-of-flight mass spectrometry is discussed. With this technique, it is possible to discover the degradation products and mechanisms in complete organic semiconductor devices.

    10. Stability of Doped Transparent Carbon Nanotube Electrodes (pages 2548–2554)

      Roderick Jackson, Benoit Domercq, Rishabh Jain, Bernard Kippelen and Samuel Graham

      Version of Record online: 28 JUL 2008 | DOI: 10.1002/adfm.200800324

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      Doped up: An increase greater than twofold in the electrical conductivity of SWNT transparent electrodes is achieved by doping with HNO3 and SOCl2. Both air and thermal stability of the electrical properties are maintained by using a thin PEDOT/PSS capping layer on the electrodes. Stability of sheet resistance with exposure to air is demonstrated in the figure.

    11. Formation of Methanofullerene Cation in Bulk Heterojunction Polymer Solar Cells Studied by Transient Absorption Spectroscopy (pages 2555–2562)

      Shunsuke Yamamoto, Jiamo Guo, Hideo Ohkita and Shinzaburo Ito

      Version of Record online: 28 JUL 2008 | DOI: 10.1002/adfm.200800411

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      Charge carriers formed in blend films of MDMO-PPV and PCBM (see figure) are investigated by transient absorption spectroscopy. In blend films with a low PCBM fraction, only MDMO-PPV hole polarons and PCBM radical anions are generated. On the other hand, with a higher PCBM fraction, PCBM radical cations are newly generated as hole carriers.

    12. Limits to Nanopatterning of Fluids on Surfaces in Soft Lithography (pages 2563–2571)

      Jens A. Wigenius, Mahiar Hamedi and Olle Inganäs

      Version of Record online: 20 AUG 2008 | DOI: 10.1002/adfm.200800073

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      Microcontact printing using bare elastomeric PDMS stamps could lead to unstable prints at dimensions below micrometer. The process has been followed with time-resolved AFM. Printed lines are rearranged into rod-shaped ridges and further contracted into spherical drops (see Figure). This instability places a fundamental limitation on patterning using macromolecular fluids, which is of general relevance to soft- and nanoimprint lithography.

    13. Aqueous Deposition of Ultraviolet Luminescent Columnar Tin-Doped Indium Hydroxide Films (pages 2572–2583)

      Yu Qiu, Paul Bellina, Lars P. H. Jeurgens, Andreas Leineweber, Udo Welzel, Peter Gerstel, Linqin Jiang, Peter A. van Aken, Joachim Bill and Fritz Aldinger

      Version of Record online: 20 AUG 2008 | DOI: 10.1002/adfm.200800181

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      Ultraviolet luminescent Sn-doped In(OH)3· xH2O (0 ≤ x ≤ 1) films were deposited directly from an aqueous solution containing InCl3, SnCl4 and hydrogen peroxide on sulfonate self-assembled monolayers. Their columnar microstructures were formed by the oriented attachment of rodlike subunites. The films show enhanced optical transmittance and electrical conductivity compared to the undoped phase.

    14. Fabrication of radial ZnO nanowire clusters and radial ZnO/PVDF composites with enhanced dielectric properties (pages 2584–2592)

      Guangsheng Wang, Yuan Deng, Yan Xiang and Lin Guo

      Version of Record online: 20 AUG 2008 | DOI: 10.1002/adfm.200800109

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      Novel ZnO nanowire clusters can be prepared on a large scale using an improved micro-emulsion method. Composites of these radial ZnO nanowires and PVDF exhibit significantly larger dielectric constants as well as better thermal stability than composites of bulk ZnO/PVDF composites, and have a low percolation threshold.

    15. High-Performance Organic Transistor Memory Elements with Steep Flanks of Hysteresis (pages 2593–2601)

      Weiping Wu, Hongliang Zhang, Ying Wang, Shanghui Ye, Yunlong Guo, Chongan Di, Gui Yu, Daoben Zhu and Yunqi Liu

      Version of Record online: 21 AUG 2008 | DOI: 10.1002/adfm.200701269

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      High performance organic transistor memory elements with steep flanks of hysteresis can be achieved by using donor non-ferroelectric polymer blends as buffer layers. The low cost and high efficiency of this method provide a promising approach to organic memory elements for practical organic circuits and products.

    16. Evidence of Interfacial Charge Transfer upon UV-Light Irradiation in Novel Titanium Oxide Gel (pages 2602–2610)

      Thomas Cottineau, Luc Brohan, Matej Pregelj, Pavel Cevc, Mireille Richard-Plouet and Denis Arčon

      Version of Record online: 8 AUG 2008 | DOI: 10.1002/adfm.200800185

      Thumbnail image of graphical abstract

      A novel electron–hole generation process upon UV illumination in a new Ti-O organic–inorganic hybrid gel is investigated using electron paramagnetic resonance (EPR). Photoreduction of surface TiIV to TiIII sites centered in weakly distorted TiO6 octahedra to which methanoate groups are bonded is proved (see figure). The unique photo-electrochemical properties of the nanostructured gel offer new possibilities in photochemical conversion and storage of solar energy.

    17. Photovoltaic Processes of Singlet and Triplet Excited States in Organic Solar Cells (pages 2611–2617)

      Zhihua Xu and Bin Hu

      Version of Record online: 8 AUG 2008 | DOI: 10.1002/adfm.200800331

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      Magnetic-field effects of the photocurrent in organic solar cells reveal that weak donor-acceptor interactions lead to a two-step photovoltaic process: polaron-pair dissociation and charge reaction. Strong donor-acceptor interactions give rise to a one-step process: direct dissociation, together with the formation of charge-transfer (CT) complexes from dissociated electrons and holes at the intermolecular interfaces between the donor and acceptor molecules.

    18. Strong, Tough, Electrospun Polymer–Nanotube Composite Membranes with Extremely Low Density (pages 2618–2624)

      David Blond, William Walshe, Karen Young, Fiona M. Blighe, Umar Khan, Dorothée Almecija, Leslie Carpenter, Joe McCauley, Werner J. Blau and Jonathan N. Coleman

      Version of Record online: 14 AUG 2008 | DOI: 10.1002/adfm.200701487

      Thumbnail image of graphical abstract

      Electrospinning is used to produce porous, polymer–nanotube composite membranes of very low density. The fibers forming these membranes can be aligned during preparation and subsequent drawing, in materials with the mechanical properties of typical plastics but with a fraction of the density.

  5. Corrections

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Corrections
    7. Index
    1. You have free access to this content
      Embedded Shape-Memory Alloy Wires for Improved Performance of Self-Healing Polymers

      Eva L. Kirkby, Joseph D. Rule, Véronique J. Michaud, Nancy R. Sottos, Scott R. White and Jan-Anders E. Månson

      Version of Record online: 5 SEP 2008 | DOI: 10.1002/adfm.200890070

      This article corrects:

      Embedded Shape-Memory Alloy Wires for Improved Performance of Self-Healing Polymers1

      Vol. 18, Issue 15, 2253–2260, Version of Record online: 23 JUL 2008

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      Fibrillar Constructs from Multilevel Hierarchical Self-Assembly of Discotic and Calamitic Supramolecular Motifs

      Nikolay Houbenov, Antti Nykänen, Hermis Iatrou, Nikos Hadjichristidis, Janne Ruokolainen, Charl F. J. Faul and Olli Ikkala

      Version of Record online: 5 SEP 2008 | DOI: 10.1002/adfm.200890071

      This article corrects:
  6. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Corrections
    7. Index

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