Advanced Functional Materials

Cover image for Vol. 23 Issue 31

August 19, 2013

Volume 23, Issue 31

Pages 3829–3940

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      Light-Emitting Diodes: Organic Light-Emitting Diodes with 30% External Quantum Efficiency Based on a Horizontally Oriented Emitter (Adv. Funct. Mater. 31/2013) (page 3829)

      Sei-Yong Kim, Won-Ik Jeong, Christian Mayr, Young-Seo Park, Kwon-Hyeon Kim, Jeong-Hwan Lee, Chang-Ki Moon, Wolfgang Brütting and Jang-Joo Kim

      Version of Record online: 12 AUG 2013 | DOI: 10.1002/adfm.201370153

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      Green phosphorescent organic light-emitting diodes (OLEDs) based on a horizontally oriented emitter are analysed by J.-J. Kim and co-workers on page 3896. They demonstrate that theoretical analysis based on the orientation factor (the ratio of horizontal dipoles to total dipoles) and the quantum yield of the emitter predicts that the maximum EQE of OLEDs with this emitter is about 30%, matching experimental data, indicating that the electrical loss of the OLEDs is negligible and the device structure can be utilized as a platform to demonstrate the validity of optical modeling.

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      Solar Cells: Honeycomb-Like Organized TiO2 Photoanodes with Dual Pores for Solid-State Dye-Sensitized Solar Cells (Adv. Funct. Mater. 31/2013) (page 3830)

      Sung Hoon Ahn, Won Seok Chi, Dong Jun Kim, Sung Yeon Heo and Jong Hak Kim

      Version of Record online: 12 AUG 2013 | DOI: 10.1002/adfm.201370154

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      A solid-state dye-sensitized solar cell with 7.4% efficiency is fabricated by J. H. Kim and co-workers using meso/macroscopic, honeycomb-like, organized TiO2 photoanodes. These electrodes have dual pores, high porosity, good interconnectivity, and excellent light scattering properties. On page 3901, an approach to control these structures via a onestep self-assembly of preformed TiO2 nanocrystals and graft copolymers is presented.

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      Capacitors: Flexible Films Derived from Electrospun Carbon Nanofibers Incorporated with Co3O4 Hollow Nanoparticles as Self-Supported Electrodes for Electrochemical Capacitors (Adv. Funct. Mater. 31/2013) (page 3944)

      Fang Zhang, Changzhou Yuan, Jiajia Zhu, Jie Wang, Xiaogang Zhang and Xiong Wen (David) Lou

      Version of Record online: 12 AUG 2013 | DOI: 10.1002/adfm.201370155

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      On page 3909, X. G. Zhang, X. W. Lou, and co-workers derive flexible porous films from electrospun carbon nanofibers incorporating Co3O4 hollow nanoparticles as advanced self-supported hybrid film electrodes for electrochemical capacitors. Such unique film electrodes exhibit very high specific capacitance and excellent electrochemical stability at high current densities. These features make them attractive for flexible power sources.

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      Masthead: (Adv. Funct. Mater. 31/2013)

      Version of Record online: 12 AUG 2013 | DOI: 10.1002/adfm.201370156

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    1. Solution-pH-Modulated Rectification of Ionic Current in Highly Ordered Nanochannel Arrays Patterned with Chemical Functional Groups at Designed Positions (pages 3836–3844)

      Cheng-Yong Li, Feng-Xiang Ma, Zeng-Qiang Wu, Hong-Li Gao, Wen-Ting Shao, Kang Wang and Xing-Hua Xia

      Version of Record online: 4 APR 2013 | DOI: 10.1002/adfm.201300315

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      A new ionic current rectification device responsive to a broad range of pH stimuli is established using highly ordered nanochannels of porous anodic alumina membrane with abrupt surface charge discontinuity. Due to the protonation/deprotonation of the patterned amine and the remaining intrinsic hydroxyl groups, the nanochannel-array-based device is able to regulate ion transport selectivity and has ionic current rectification properties.

    2. Soft Iron/Silicon Composite Tubes for Magnetic Peristaltic Pumping: Frequency-Dependent Pressure and Volume Flow (pages 3845–3849)

      Roland Fuhrer, Christoph M. Schumacher, Martin Zeltner and Wendelin J. Stark

      Version of Record online: 6 MAR 2013 | DOI: 10.1002/adfm.201203572

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      Magnetic silicone tubes with 67 wt% magnetic particles and an inner diameter of elliptical shape allow very efficient contractions of the tube by applying an external magnetic field. The combination of magnetic silicone tubes and a magnetic field generating device results in a magnetic peristaltic pump.

    3. Fused Thiophene Semiconductors: Crystal Structure–Film Microstructure Transistor Performance Correlations (pages 3850–3865)

      Jangdae Youn, Sumit Kewalramani, Jonathan D. Emery, Yanrong Shi, Shiming Zhang, Hsiu-Chieh Chang, You-jhih Liang, Chia-Ming Yeh, Chieh-Yuan Feng, Hui Huang, Charlotte Stern, Liang-Hsiang Chen, Jia-Chong Ho, Ming-Chou Chen, Michael J. Bedzyk, Antonio Facchetti and Tobin J. Marks

      Version of Record online: 13 MAR 2013 | DOI: 10.1002/adfm.201203439

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      The thin film molecular packing motifs of several new benzo[d,d]thieno[3,2-b;4,5-b]dithiophene (BTDT) derivatives have different molecular packings from their bulk crystals. Co-existence of strained lattices with their single crystal forms is speculated to have a significant effect on organic thin-film transistor (OTFT) performance.

    4. Core-Brominated Tetraazaperopyrenes as n-Channel Semiconductors for Organic Complementary Circuits on Flexible Substrates (pages 3866–3874)

      Sonja Geib, Ute Zschieschang, Marcel Gsänger, Matthias Stolte, Frank Würthner, Hubert Wadepohl, Hagen Klauk and Lutz H. Gade

      Version of Record online: 8 MAR 2013 | DOI: 10.1002/adfm.201203600

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      The preparation of brominated tetraazaperopyrenes, their crystal structures, and their electrochemical properties are reported. These N-heterocyclic peropyrene derivatives are well-suited materials for the preparation of n-channel conducting organic thin-film transistors either by vacuum deposition or by solution processing. Additionally, the fabrication of a complementary ring oscillator on a flexible substrate is described.

    5. Charge-Tunable Autoclaved Silk-Tropoelastin Protein Alloys That Control Neuron Cell Responses (pages 3875–3884)

      Xiao Hu, Min D. Tang-Schomer, Wenwen Huang, Xiao-Xia Xia, Anthony S. Weiss and David L. Kaplan

      Version of Record online: 8 MAR 2013 | DOI: 10.1002/adfm.201202685

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      Molecular interaction mechanisms between silk fibroin and recombinant human tropoelastin are utilized to generate multifunctional protein alloys with different net charges. The combination of their properties in alloy format extends the versatility of both structural proteins, providing a new biocompatible, biodegradable, and charge-tunable biomaterial platform for neural repair.

    6. Development of Degradable, pH-Sensitive Star Vectors for Enhancing the Cytoplasmic Delivery of Nucleic Acids (pages 3885–3895)

      Yasemin Yuksel Durmaz, Yen-Ling Lin and Mohamed E. H. ElSayed

      Version of Record online: 11 MAR 2013 | DOI: 10.1002/adfm.201203762

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      A series of degradable, pH-sensitive, membrane-destabilizing, star-shaped polymers is synthesized. Star polymers are engineered to “sense” the drop in endosomal pH, which triggers the hydrolysis of acid-labile hydrazone linkages and release of membrane-active grafts that rupture the endosomal membrane and release the loaded siRNA cargo into the cytoplasm to produce the desired knockdown of targeted gene expression at both the mRNA and protein levels.

    7. Organic Light-Emitting Diodes with 30% External Quantum Efficiency Based on a Horizontally Oriented Emitter (pages 3896–3900)

      Sei-Yong Kim, Won-Ik Jeong, Christian Mayr, Young-Seo Park, Kwon-Hyeon Kim, Jeong-Hwan Lee, Chang-Ki Moon, Wolfgang Brütting and Jang-Joo Kim

      Version of Record online: 27 MAR 2013 | DOI: 10.1002/adfm.201300104

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      High-efficiency phosphorescent organic light-emitting diodes (OLEDs) doped with Ir(ppy)2(acac) in an exciplex forming co-host have a preferred horizontal emitter orientation. Based on optical analysis a maximum efficiency of the OLEDs of about 30% is calculated, which matches very well with the experimental data. Furthermore, a simple method to predict the maximum efficiency achievable with a certain emitting dye in a host matrix is suggested.

    8. Honeycomb-Like Organized TiO2 Photoanodes with Dual Pores for Solid-State Dye-Sensitized Solar Cells (pages 3901–3908)

      Sung Hoon Ahn, Won Seok Chi, Dong Jun Kim, Sung Yeon Heo and Jong Hak Kim

      Version of Record online: 27 MAR 2013 | DOI: 10.1002/adfm.201203851

      Thumbnail image of graphical abstract

      Meso/macroscopic, honeycomb-like organized TiO2 photoanodes with dual pores, high porosity, good interconnectivity, and excellent light scattering properties result in high efficiency solid-state dye-sensitized solar cells (7.4% at 100 mW/cm2). This value is one of the highest observed for N719 dye.

    9. Flexible Films Derived from Electrospun Carbon Nanofibers Incorporated with Co3O4 Hollow Nanoparticles as Self-Supported Electrodes for Electrochemical Capacitors (pages 3909–3915)

      Fang Zhang, Changzhou Yuan, Jiajia Zhu, Jie Wang, Xiaogang Zhang and Xiong Wen (David) Lou

      Version of Record online: 26 MAR 2013 | DOI: 10.1002/adfm.201203844

      Thumbnail image of graphical abstract

      Flexible porous films derived from electrospun carbon nanofibers incorporated with Co3O4 hollow nanoparticles are efficiently fabricated and directly applied as advanced self-supported hybrid film electrodes. The exhibit very high specific capacitance and excellent electrochemical stability at high current densities.

    10. Random Lasing in Self-Assembled Dye-Doped Latex Nanoparticles: Packing Density Effects (pages 3916–3924)

      Luis Cerdán, Angel Costela, Eduardo Enciso and Inmaculada García-Moreno

      Version of Record online: 6 MAR 2013 | DOI: 10.1002/adfm.201202616

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      Efficient random lasing (RL) from self-assembled dye-doped latex nanoparticles presenting size polydispersity is reported. Both the nanoparticle size and size polydispersity influence the RL emission properties. The use of binary mixtures of nanoparticles with different sizes improves the RL emission properties with respect to the mixture constituents separately due to an increase in the filling fraction.

    11. Energetics of Donor-Doping, Metal Vacancies, and Oxygen-Loss in A-Site Rare-Earth-Doped BaTiO3 (pages 3925–3928)

      Colin L. Freeman, James A. Dawson, Hung-Ru Chen, Liubin Ben, John H. Harding, Finlay D. Morrison, Derek C. Sinclair and Anthony R. West

      Version of Record online: 6 MAR 2013 | DOI: 10.1002/adfm.201203147

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      The defect structure of 4% La-doped BaTiO3 with 4 LaBa and a Ti vacancy is shown. The loss of Ti encourages the creation of an oxygen vacancy and the subsequent electron compensation creates Ti3+, which generates the semiconducting behavior seen for the these samples.

    12. Biomimetic Structural Electrochemistry from Conducting Polymers: Processes, Charges, and Energies. Coulovoltammetric Results from Films on Metals Revisited (pages 3929–3940)

      Toribio F. Otero, Mercedes Alfaro, Venancio Martinez, Maria A. Perez and Jose G. Martinez

      Version of Record online: 8 MAR 2013 | DOI: 10.1002/adfm.201203502

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      Coulovoltammetric responses from films of conducting polymers coating metal electrodes allow a graphical separation, identification, and quantification of reversible and irreversible reactions; structural (shrinking, compaction, relaxation and swelling) components of the reversible film reaction; their potential domains; charges; and energies consumed by every structural process.

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