Advanced Materials

Cover image for Vol. 23 Issue 45

December 1, 2011

Volume 23, Issue 45

Pages 5331–5455

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Hybrid Light-Emitting Diodes: Electrically Driven Quantum Dot/Wire/Well Hybrid Light-Emitting Diodes (Adv. Mater. 45/2011) (page 5331)

      Young-Ho Ko, Je-Hyung Kim, Li-Hua Jin, Suk-Min Ko, Bong-Joon Kwon, Joosung Kim, Taek Kim and Yong-Hoon Cho

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190181

      Thumbnail image of graphical abstract

      Electrically driven hybrid light-emitting diodes (LEDs) consisting of quantum dots, wires, and wells based on the nanometer-sized pyramid GaN structure are reported by Taek Kim, Yong-Hoon Cho, and co-workers on page 5364. The LEDs exhibit mixed emissions from InGaN quantum dots, wires, and wells formed at the tops, edges, and sidewalls of the pyramids, respectively. The hybrid LEDs containing low-dimensional quantum structures provide a broad-band, highly efficient visible lighting source.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Theranostic Nanoshells: Facile Synthesis of Monodisperse Superparamagnetic Fe3O4 Core@hybrid@Au Shell Nanocomposite for Bimodal Imaging and Photothermal Therapy (Adv. Mater. 45/2011) (page 5332)

      Wenjie Dong, Yongsheng Li, Dechao Niu, Zhi Ma, Jinlou Gu, Yi Chen, Wenru Zhao, Xiaohang Liu, Changsheng Liu and Jianlin Shi

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190183

      Thumbnail image of graphical abstract

      A simple but controllable seed-mediated growth route to fabricate a monodisperse, uniform superparamagnetic Fe3O4 core/gold shell structured nanocomposite is reported by Yongsheng Li, Jianlin Shi, and co-workers on page 5392. An intense magnetic resonance imaging (MRI) con-trasting effect is generated in a 3D magnetic field, allowing the identification of the location and size of a tumor, and targeted NIR laser-induced photo-thermal therapy is carried out.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Contents: (Adv. Mater. 45/2011) (pages 5333–5338)

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190177

  4. Apology

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Apology: Infrared Photodetectors Based on Reduced Graphene Oxide and Graphene Nanoribbons (page 5339)

      Basant Chitara, L. S. Panchakarla, S. B. Krupanidhi and C. N. R. Rao

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190182

      This article corrects:

      Infrared Photodetectors Based on Reduced Graphene Oxide and Graphene Nanoribbons

      Vol. 23, Issue 45, 5419–5424, Article first published online: 22 JUL 2011

  5. Corrections

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Correction: Macroscale Elastomeric Conductors Generated from Hydrothermally Synthesized Metal-Polymer Hybrid Nanocable Sponge (page 5339)

      Hong-Bin Yao, Gang Huang, Chun-Hua Cui, Xiao-Han Wang and Shu-Hong Yu

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190184

      This article corrects:
    2. You have free access to this content
      Correction: Pattern Transfer and Electric-Field-Induced Magnetic Domain Formation in Multiferroic Heterostructures (page 5340)

      Tuomas H. E. Lahtinen, Jussi. O. Tuomi and Sebastiaan van Dijken

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190178

      This article corrects:

      Pattern Transfer and Electric-Field-Induced Magnetic Domain Formation in Multiferroic Heterostructures

      Vol. 23, Issue 28, 3187–3191, Article first published online: 25 MAY 2011

  6. Progress Report

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Graphene – A Promising Material for Organic Photovoltaic Cells (pages 5342–5358)

      Xiangjian Wan, Guankui Long, Lu Huang and Yongsheng Chen

      Article first published online: 29 SEP 2011 | DOI: 10.1002/adma.201102735

      Thumbnail image of graphical abstract

      The application of graphene in organic photovoltaics as the transparent electrode, active layer or interface layer is reviewed. While research on this topic is still in the very early stages, the impressive results indicate that potentially a great future for graphene application in organic photovoltaic cells lies ahead.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Efficient Small Molecule Bulk Heterojunction Solar Cells with High Fill Factors via Pyrene-Directed Molecular Self-Assembly (pages 5359–5363)

      Olivia P. Lee, Alan T. Yiu, Pierre M. Beaujuge, Claire H. Woo, Thomas W. Holcombe, Jill E. Millstone, Jessica D. Douglas, Mark S. Chen and Jean M. J. Fréchet

      Article first published online: 21 OCT 2011 | DOI: 10.1002/adma.201103177

      Thumbnail image of graphical abstract

      Efficient organic photovoltaic (OPV) materials are constructed by attaching completely planar, symmetric end-groups to donor-acceptor electroactive small molecules. Appending C2-pyrene as the small molecule end-group to a diketopyrrolopyrrole core leads to materials with a tight, aligned crystal packing and favorable morphology dictated by ππ interactions, resulting in high power conversion efficiencies and high fill factors. The use of end-groups to direct molecular self-assembly is an effective strategy for designing high-performance small molecule OPV devices.

    2. Electrically Driven Quantum Dot/Wire/Well Hybrid Light-Emitting Diodes (pages 5364–5369)

      Young-Ho Ko, Je-Hyung Kim, Li-Hua Jin, Suk-Min Ko, Bong-Joon Kwon, Joosung Kim, Taek Kim and Yong-Hoon Cho

      Article first published online: 17 OCT 2011 | DOI: 10.1002/adma.201102534

      Thumbnail image of graphical abstract

      Electrically driven quantum dot, wire, and well hybrid light-emitting diodes are demonstrated by using nanometer-sized pyramid structures of GaN. InGaN quantum dots, wires, and wells are formed at the tops, edges, and sidewalls of pyramids, respectively. The hybrid light-emitting diodes containing low-dimensional quantum structures are good candidates for broad-band highly efficient visible lighting sources.

    3. The Origin of a 650 nm Photoluminescence Band in Rubrene (pages 5370–5375)

      Yuanzhen Chen, Bumsu Lee, Danni Fu and Vitaly Podzorov

      Article first published online: 17 OCT 2011 | DOI: 10.1002/adma.201102294

      Thumbnail image of graphical abstract

      Commonly observed variations in photoluminescence (PL) spectra of crystalline organic semiconductors, including the appearance or enhancement of certain PL bands, are shown to originate from a small amount of structural disorder (e.g., amorphous inclusions embedded in a crystal), rather than be necessarily related to chemical impurities or material oxidation. For instance, in rubrene, a minute amount of such disorder can lead to the appearance of a dominant PL band at 650 nm as a result of triplet excitons captured and fused at these sites, with a subsequent emission from the amorphous phase.

  8. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Ferroelectric Materials: Conduction at Domain Walls in Insulating Pb(Zr0.2Ti0.8)O3 Thin Films (Adv. Mater. 45/2011) (page 5376)

      Jill Guyonnet, Iaroslav Gaponenko, Stefano Gariglio and Patrycja Paruch

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190179

      Thumbnail image of graphical abstract

      Electrical conduction at domain walls in the widely used ferroelectric insulator Pb(Zr0.2Ti0.8)O3 is demonstrated in local probe microscopy measurements by Patrycja Paruch and co-workers. The results suggest that this phenomenon, previously observed only in the complex multiferroic BiFeO3, is much more general than previously thought. Such nanoscale conduction channels offer great promise for potential applications in miniaturized devices.

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Conduction at Domain Walls in Insulating Pb(Zr0.2Ti0.8)O3 Thin Films (pages 5377–5382)

      Jill Guyonnet, Iaroslav Gaponenko, Stefano Gariglio and Patrycja Paruch

      Article first published online: 28 SEP 2011 | DOI: 10.1002/adma.201102254

      Thumbnail image of graphical abstract

      Domain wall conduction in insulating Pb(Zr0.2Ti0.8)O3thin films is demonstrated. The observed electrical conduction currents can be clearly differentiated from displacement currents associated with ferroelectric polarization switching. The domain wall conduction, nonlinear and highly asymmetric due to the specific local probe measurement geometry, shows thermal activation at high temperatures, and high stability over time.

    2. Tungsten Oxide as a Gate Dielectric for Highly Transparent and Temperature-Stable Zinc-Oxide-Based Thin-Film Transistors (pages 5383–5386)

      Michael Lorenz, Holger von Wenckstern and Marius Grundmann

      Article first published online: 14 OCT 2011 | DOI: 10.1002/adma.201103087

      Thumbnail image of graphical abstract

      Tungsten oxide is currently used as gate insulator in pH-sensing ion-sensitive field-effect transistors (ISFETs) and in electrochromic devices. Its great potential as a high-κ dielectric with high transparency and temperature stability is reported. Owing to the low gate voltage sweep necessary to turn the transistor on and off, a possible application could be as a low-voltage pixel driver in active-matrix displays in harsh environments.

    3. High-Performance Solar Cells using a Solution-Processed Small Molecule Containing Benzodithiophene Unit (pages 5387–5391)

      Yongsheng Liu, Xiangjian Wan, Fei Wang, Jiaoyan Zhou, Guankui Long, Jianguo Tian and Yongsheng Chen

      Article first published online: 21 OCT 2011 | DOI: 10.1002/adma.201102790

      Thumbnail image of graphical abstract

      A conjugated small molecule containing a benzodithiophene unit shows high performance in bulk heterojunction (BHJ) solar cells. Using the simple solution spinning process, a high PCE is achieved by employing this molecule as the donor in BHJ solar cells.

    4. Facile Synthesis of Monodisperse Superparamagnetic Fe3O4 Core@hybrid@Au Shell Nanocomposite for Bimodal Imaging and Photothermal Therapy (pages 5392–5397)

      Wenjie Dong, Yongsheng Li, Dechao Niu, Zhi Ma, Jinlou Gu, Yi Chen, Wenru Zhao, Xiaohang Liu, Changsheng Liu and Jianlin Shi

      Article first published online: 14 OCT 2011 | DOI: 10.1002/adma.201103521

      Thumbnail image of graphical abstract

      A simple seed-mediated growth route is developed to fabricate monodisperse, uniform superparamagnetic Fe3O4 core/gold shell structured nanocomposites with tunable sizes and optical properties, in which gold seed formation and attachment onto the core surface via S–Au covalent bonding proceeds almost simultaneously in the one-pot synthesis. The as-prepared nanocomposite is demonstrated to have a great potential for magnetic resonance imaging (MRI)-guided, focused photothermal tumor therapy under near-IR laser radiation.

    5. Parallel Bulk-Heterojunction Solar Cell by Electrostatically Driven Phase Separation (pages 5398–5403)

      Antti Ojala, Hannah Bürckstümmer, Matthias Stolte, Rüdiger Sens, Helmut Reichelt, Peter Erk, Jaehyung Hwang, Dirk Hertel, Klaus Meerholz and Frank Würthner

      Article first published online: 21 OCT 2011 | DOI: 10.1002/adma.201103167

      Thumbnail image of graphical abstract

      Thermal co-evaporation of C60 fullerene and two merocyanine dyes affords bulk heterojunction solar cells with improved short-circuit currents and power conversion efficiencies in comparison with the respective single donor cells. These results are rationalized by the formation of three distinct subphases driven by differences in molecular shape and electrostatic interactions.

    6. Combinatorial Optimization of a Molecular Glass Photoresist System for Electron Beam Lithography (pages 5404–5408)

      Wolfgang-Andreas C. Bauer, Christian Neuber, Christopher K. Ober and Hans-Werner Schmidt

      Article first published online: 18 OCT 2011 | DOI: 10.1002/adma.201103107

      Thumbnail image of graphical abstract

      Electron beam lithography is a powerful technique for the productionof nanostructures but pattern quality depends on numerous interacting process variables. Orthogonal gradients of resist composition, baking temperatures, and development time as well as dose variations inside writing fields are used to prepare ternary combinatorial libraries for an efficient stepwise optimization of a molecular glass negative tone resist system.

  10. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Perfect Plasmonic Absorber: Design of a Perfect Black Absorber at Visible Frequencies Using Plasmonic Metamaterials (Adv. Mater. 45/2011) (page 5409)

      Mehdi Keshavarz Hedayati, Mojtaba Javaherirahim, Babak Mozooni, Ramzy Abdelaziz, Ali Tavassolizadeh, Venkata Sai Kiran Chakravadhanula, Vladimir Zaporojtchenko, Thomas Strunkus, Franz Faupel and Mady Elbahri

      Article first published online: 29 NOV 2011 | DOI: 10.1002/adma.201190180

      Thumbnail image of graphical abstract

      As reported by Mady Elbahri and co-workers, a bent polymeric film coated with a black logo of the Nanochemistry and Nanoen-gineering group (colored TEM image of nanoparticles as the back-ground) demonstrates a plasmonic, perfect black absorber. This is achieved by combination of a metal film with suitable metal/dielectric nanocomposites and has potential applications in optoelectronics such as solar absorbers and photovoltaic devices.

  11. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Apology
    6. Corrections
    7. Progress Report
    8. Communications
    9. Frontispiece
    10. Communications
    11. Frontispiece
    12. Communications
    1. Design of a Perfect Black Absorber at Visible Frequencies Using Plasmonic Metamaterials (pages 5410–5414)

      Mehdi Keshavarz Hedayati, Mojtaba Javaherirahim, Babak Mozooni, Ramzy Abdelaziz, Ali Tavassolizadeh, Venkata Sai Kiran Chakravadhanula, Vladimir Zaporojtchenko, Thomas Strunkus, Franz Faupel and Mady Elbahri

      Article first published online: 14 OCT 2011 | DOI: 10.1002/adma.201102646

      Thumbnail image of graphical abstract

      The design and fabrication of a plasmonic black absorber with almost 100% absorbance spanning a broad range of frequencies from ultraviolet (UV) to the near infrared (NIR) is demonstrated. The perfect plasmonic absorber is achieved by a combination of a metal film with suitable metal/dielectric nanocomposites. Our fabrication technique is simple, versatile, cost-effective, and compatible with current industrial methods for solar absorber production.

    2. Surfaces That Sequester Serum-Borne Heparin Amplify Growth Factor Activity (pages 5415–5418)

      Gregory A. Hudalla, Justin T. Koepsel and William L. Murphy

      Article first published online: 26 OCT 2011 | DOI: 10.1002/adma.201103046

      Thumbnail image of graphical abstract

      Surfaces presenting a heparin-binding peptide can non-covalently sequester heparin from culture supplements, such as fetal bovine serum. In turn, sequestered, serum-borne heparin can non-covalently localize growth factors at the cell-material interface, resulting in amplified growth factor bioactivity.

    3. Infrared Photodetectors Based on Reduced Graphene Oxide and Graphene Nanoribbons (pages 5419–5424)

      Basant Chitara, L. S. Panchakarla, S. B. Krupanidhi and C. N. R. Rao

      Article first published online: 22 JUL 2011 | DOI: 10.1002/adma.201101414

      Thumbnail image of graphical abstract

      The use of reduced graphene oxide (RGO) and graphene nanoribbons (GNRs) as infrared photodetectors is explored, based on recent results dealing with solar cells, light-emitting devices, photodetectors, and ultrafast lasers. IR detection is demonstrated by both RGO and GNRs (see image) in terms of the time-resolved photocurrent and photoresponse. The responsivity of the detectors and their functioning are presented.

    4. Ultrasensitive Diagnosis for an Anthrax-Protective Antigen Based on a Polyvalent Directed Peptide Polymer Coupled to Zinc Oxide Nanorods (pages 5425–5429)

      Hye-Yeon Park, Vinayakumar Gedi, Joungmok Kim, Hae-Chul Park, Sung-Hwan Han and Moon-Young Yoon

      Article first published online: 14 OCT 2011 | DOI: 10.1002/adma.201103284

      Thumbnail image of graphical abstract

      A flexible poly-D-lysine polymer conjugated with different target-binding peptides is demonstrated with an ultralow concentration detection limit compared to those of other conventional detection systems. This polyvalent directed peptide polymer (PDPP) exhibits increased binding affinity and detects anthrax protective antigen at low levels using a well-known zinc oxide nanorod detection system.

    5. Stereoselective Synthesis, Efficient Light Emission, and High Bipolar Charge Mobility of Chiasmatic Luminogens (pages 5430–5435)

      Zujin Zhao, Jacky W. Y. Lam, Carrie Y. K. Chan, Shuming Chen, Jianzhao Liu, Ping Lu, Mario Rodriguez, José-Luis Maldonado, Gabriel Ramos-Ortiz, Herman H. Y. Sung, Ian D. Williams, Huimin Su, Kam Sing Wong, Yuguang Ma, Hoi Sing Kwok, Huayu Qiu and Ben Zhong Tang

      Article first published online: 21 OCT 2011 | DOI: 10.1002/adma.201102804

      Thumbnail image of graphical abstract

      Stereoregular tetraphenylethene derivatives (Z)-o-BCaPTPE and (Z)-o-BTPATPE featured with chiasmatic conformations and aggregation-enhanced emission characteristics are synthesized using a McMurry reaction. Both luminogens exhibit high hole and electron mobilities. Organic light-emitting diodes (OLEDs) using (Z)-o-BCaPTPE and (Z)-o-BTPATPE as both the light-emitting and electron-transporting layers show high efficiencies.

    6. Aligned Carbon Nanotube Sheets for the Electrodes of Organic Solar Cells (pages 5436–5439)

      Zhibin Yang, Tao Chen, Ruixuan He, Guozhen Guan, Houpu Li, Longbin Qiu and Huisheng Peng

      Article first published online: 24 OCT 2011 | DOI: 10.1002/adma.201103509

      Thumbnail image of graphical abstract

      Aligned carbon nanotube sheets are developed as a new family of electrodes to fabricate dye-sensitized solar cells. The energy conversion efficiency of the resulting cell is higher than the randomly dispersed carbon nanotube film and comparable with the platinum. Novel and flexible solar cells can be easily made from such carbon nanotube sheets with high potentials.

    7. High-Strain Sensors Based on ZnO Nanowire/Polystyrene Hybridized Flexible Films (pages 5440–5444)

      Xu Xiao, Longyan Yuan, Junwen Zhong, Tianpeng Ding, Yu Liu, Zhixiang Cai, Yaoguang Rong, Hongwei Han, Jun Zhou and Zhong Lin Wang

      Article first published online: 17 OCT 2011 | DOI: 10.1002/adma.201103406

      Thumbnail image of graphical abstract

      A type of strain sensor with high tolerable strain based on a ZnO nanowires/polystyrene nanofibers hybrid structure on a polydimethylsiloxane film is reported. The novel strain sensor can measure and withstand high strain and demonstrates good performance on rapid human-motion measurements. In addition, the device could be driven by solar cells. The results indicate that the device has potential applications as an outdoor sensor system.

    8. Metal Nitride/Graphene Nanohybrids: General Synthesis and Multifunctional Titanium Nitride/Graphene Electrocatalyst (pages 5445–5450)

      Zhenhai Wen, Shumao Cui, Haihui Pu, Shun Mao, Kehan Yu, Xinliang Feng and Junhong Chen

      Article first published online: 20 OCT 2011 | DOI: 10.1002/adma.201102772

      Thumbnail image of graphical abstract

      A facile, efficient, and general strategy is developed for the fabrication of a new class of nanohybrids consisting of nitrogen-doped graphene functionalized with metal nitride nanoparticles. The graphene decorated with titanium nitride nanoparticles is explored for multifunctional electrocatalytic applications, i.e., as a low-cost counter electrode for I3 reduction in dye-sensitized solar cells and for nicotinamide adenine dinucleotide (NADH) oxidation in dehydrogenase enzyme-based biosensors.

    9. Enhanced Performance and Air Stability of 3.2% Hybrid Solar Cells: How the Functional Polymer and CdTe Nanostructure Boost the Solar Cell Efficiency (pages 5451–5455)

      Hsieh-Chih Chen, Chih-Wei Lai, I-Che Wu, Hsin-Ru Pan, I-Wen P. Chen, Yung-Kang Peng, Chien-Liang Liu, Chun- hsien Chen and Pi-Tai Chou

      Article first published online: 18 OCT 2011 | DOI: 10.1002/adma.201102775

      Thumbnail image of graphical abstract

      A record high PCE of up to 3.2% demonstrates that the efficiency of hybrid solar cells (HSCs) can be boosted by utilizing a unique mono-aniline end group of PSBTBT-NH2 as a strong anchor to attach to CdTe nanocrystal surfaces and by simultaneously exploiting benzene–1,3-dithiol solvent–vapor annealing to improve the charge separation at the donor/acceptor interface, which leads to efficient charge transportation in the HSCs.

SEARCH

SEARCH BY CITATION