Advanced Functional Materials

Cover image for Vol. 23 Issue 18

May 13, 2013

Volume 23, Issue 18

Pages 2221–2337

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      Nanocarriers: A Near-Infrared Light-Triggered Nanocarrier with Reversible DNA Valves for Intracellular Controlled Release (Adv. Funct. Mater. 18/2013) (page 2221)

      Na Li, Zhengze Yu, Wei Pan, Yaoyao Han, Tingting Zhang and Bo Tang

      Version of Record online: 6 MAY 2013 | DOI: 10.1002/adfm.201370087

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      On page 2255, Bo Tang and co-workers report a method to construct near-infrared light-triggered nanocarriers with reversible valves. The release amounts of the cargo molecules can be controlled precisely by adjusting the irradiation time and the laser on-off cycles. The therapeutic effect toward cancer cells can also be regulated when doxorubicin is loaded into the nanocarrier.

  2. Inside Front Cover

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      Stimuli-Responsive Materials: Hierarchical Multi-Step Folding of Polymer Bilayers (Adv. Funct. Mater. 18/2013) (page 2222)

      Georgi Stoychev, Sébastien Turcaud, John W. C. Dunlop and Leonid Ionov

      Version of Record online: 6 MAY 2013 | DOI: 10.1002/adfm.201370088

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      The multistep folding of stimuli-responsive polymer films with different shapes is demonstrated by Leonid Ionov and co-workers on page 2295. It is observed that deformed shapes differ from the classical ones, such as tubes or flowers, and one can introduce sharp hinges into the folded structure by the proper design of the bilayer's shape. Experimental observations lead to the derivation of empirical folding rules. It is then demonstrated how those rules can be used to direct the folding of edge-activated polymer bilayers.

  3. Masthead

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      Masthead: (Adv. Funct. Mater. 18/2013)

      Version of Record online: 6 MAY 2013 | DOI: 10.1002/adfm.201370089

  4. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Masthead
    5. Contents
    6. Correspondences
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  5. Correspondences

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    1. Comment on “The Origin of Magnetism in Mn-Doped SrTiO3 (pages 2229–2230)

      Alexander Tkach, Paula M. Vilarinho, Wolfgang Kleemann, Vladimir V. Shvartsman, Pavel Borisov and Subhankar Bedanta

      Version of Record online: 2 DEC 2012 | DOI: 10.1002/adfm.201202314

    2. Response to “Comment on ‘The Origin of Magnetism in Mn-Doped SrTiO3’” (pages 2231–2232)

      Matjaz Valant, Taras Kolodiazhnyi, Iztok Arčon, Frederic Aguesse, Anna-Karin Axelsson and Neil M. Alford

      Version of Record online: 27 DEC 2012 | DOI: 10.1002/adfm.201203487

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    1. A Possible Reaction Pathway to Fabricate a Half-Metallic Wire on a Silicon Surface (pages 2233–2238)

      Yun Hao Lu, Hongmei Jin, Hongjun Zhu, Shuo-Wang Yang, Chun Zhang, Jian Zhong Jiang and Yuan Ping Feng

      Version of Record online: 6 DEC 2012 | DOI: 10.1002/adfm.201202142

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      A possible way to fabricate a half-metallic sandwich molecular wire on a silicon surface is proposed using first-principle calculations. The magnetic state of this molecular wire is sensitive to the electric field and can be changed between two states. The hybrid system has very promising application in emerging molecular electronic or spintronic devices.

    2. The Photo-Stability of Polymer Solar Cells: Contact Photo-Degradation and the Benefits of Interfacial Layers (pages 2239–2247)

      Graeme Williams, Qi Wang and Hany Aziz

      Version of Record online: 10 DEC 2012 | DOI: 10.1002/adfm.201202567

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      Exposure of organic solar cells (OSCs) to light results in degradation in all OSC parameters, even in inert environments. The use of electron extraction layers (EELs) in between the organic layer and an Al layer can largely suppress contact photo-degradation and enhance OSC photo-stability. Lithium acetylacetonate, as a new EEL material, provides efficiency improvement on par with the ubiquitous LiF, but with some additional stability improvement.

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      Beyond von-Neumann Computing with Nanoscale Phase-Change Memory Devices (pages 2248–2254)

      C. David Wright, Peiman Hosseini and Jorge A. Vazquez Diosdado

      Version of Record online: 12 DEC 2012 | DOI: 10.1002/adfm.201202383

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      Nanometer-scale GeSbTe phase-change memory type devices are shown to provide an efficient and effective route to computing in which processing and storage are carried out simultaneously and at the same physical location, circumventing the “von Neumann bottleneck”. Advanced processing including factorization and fractional division are demonstrated, with single GeSbTe cells performing computations that require around 100 transistors in conventional Si processors.

    4. A Near-Infrared Light-Triggered Nanocarrier with Reversible DNA Valves for Intracellular Controlled Release (pages 2255–2262)

      Na Li, Zhengze Yu, Wei Pan, Yaoyao Han, Tingting Zhang and Bo Tang

      Version of Record online: 2 DEC 2012 | DOI: 10.1002/adfm.201202564

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      A novel near-infrared light-triggered nanocarrier is developed based on mesoporous silica-coated gold nanorods with reversible DNA valves. The release amount of the cargo molecules can be controlled precisely by adjusting the irradiation time and the laser on-off cycles. The controlled release can be accomplished in living cells. Moreover, the therapeutic effect toward cancer cells can also be regulated.

    5. Highly Conductive Porous Graphene/Ceramic Composites for Heat Transfer and Thermal Energy Storage (pages 2263–2269)

      Mi Zhou, Tianquan Lin, Fuqiang Huang, Yajuan Zhong, Zhou Wang, Yufeng Tang, Hui Bi, Dongyun Wan and Jianhua Lin

      Version of Record online: 2 DEC 2012 | DOI: 10.1002/adfm.201202638

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      A novel architecture of 3D graphene is proposed by direct growth on porous Al2O3 ceramics by using chemical vapor deposition. The graphene/Al2O3 composite provides enormous conductive pathways for electron and phonon transport, suitable for application as a heat sink. Furthermore, the composite acts as a new type of highly thermally conductive reservoir to accommodate phase change materials for thermal energy storage.

    6. Highly Stable Nanoporous Sulfur-Bridged Covalent Organic Polymers for Carbon Dioxide Removal (pages 2270–2276)

      Hasmukh A. Patel, Ferdi Karadas, Jeehye Byun, Joonho Park, Erhan Deniz, Ali Canlier, Yousung Jung, Mert Atilhan and Cafer T. Yavuz

      Version of Record online: 17 DEC 2012 | DOI: 10.1002/adfm.201202442

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      A robust, one pot synthesis of sulfur and nitrogen rich covalent organic polymers (COPs) leads to porous network polymers with exceptional CO2 capture capacities, water stability, and selectivity of CO2 over N2. COPs require multidentate cores and linkers to form permanent micropores, a desired feature for gas capture and separation.

    7. Alkyl Chain Orientations in Dicyanomethylene-Substituted 2,5-Di(thiophen-2-yl)thieno-[3,2-b]thienoquinoid: Impact on Solid-State and Thin-Film Transistor Performance (pages 2277–2284)

      Qinghe Wu, Shendong Ren, Mao Wang, Xiaolan Qiao, Hongxiang Li, Xike Gao, Xiaodi Yang and Daoben Zhu

      Version of Record online: 2 DEC 2012 | DOI: 10.1002/adfm.201202744

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      N-type organic semiconductors with different alkyl chain orientations are strategically designed and synthesized. Experimental results show that the orientations of alkyl chains strongly affect the charge transport property and molecular packing of organic semiconductors.

    8. Thiocyanate-Free Ru(II) Sensitizers with a 4,4′-Dicarboxyvinyl-2,2′-bipyridine Anchor for Dye-Sensitized Solar Cells (pages 2285–2294)

      Kuan-Lin Wu, Wan-Ping Ku, Sheng-Wei Wang, Aswani Yella, Yun Chi, Shih-Hung Liu, Pi-Tai Chou, Mohammad K. Nazeeruddin and Michael Grätzel

      Version of Record online: 10 DEC 2012 | DOI: 10.1002/adfm.201201876

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      A new class of thiocyanate-free Ru(II) sensitizers with 4,4′-dicarboxyvinyl-2,2′-bipyridine anchors are synthesized and used in dye-sensitized solar cells (DSCs). The DSCs are investigated via current–voltage characteristics, incident photon-to-current conversion efficiency (IPCE), impedance spectra, as well as transient photocurrent and photovoltage decay measurements.

    9. Hierarchical Multi-Step Folding of Polymer Bilayers (pages 2295–2300)

      Georgi Stoychev, Sébastien Turcaud, John W. C. Dunlop and Leonid Ionov

      Version of Record online: 26 NOV 2012 | DOI: 10.1002/adfm.201203245

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      Highly complex multi-step folding of isotropic stimuli-responsive polymer bilayers results in a variety of 2D and 3D structures. Experimental observations allow determination of empirical rules, which can be used to direct the folding of polymer films in a predictable manner.

    10. Label-Free Electrical Detection of DNA Hybridization on Graphene using Hall Effect Measurements: Revisiting the Sensing Mechanism (pages 2301–2307)

      Cheng-Te Lin, Phan Thi Kim Loan, Tzu-Yin Chen, Keng-Ku Liu, Chang-Hsiao Chen, Kung-Hwa Wei and Lain-Jong Li

      Version of Record online: 9 JAN 2013 | DOI: 10.1002/adfm.201202672

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      Label-free, single-base sequence selective detection of DNA hybridization based on a single-layer graphene device is investigated using Hall effect measurements with the Van der Pauw method. The increase in hole carrier density, indicating p-doping to graphene, is better correlated to the DNA hybridization compared with the commonly used parameters such as conductivity change.

    11. Ultrastretchable Fibers with Metallic Conductivity Using a Liquid Metal Alloy Core (pages 2308–2314)

      Shu Zhu, Ju-Hee So, Robin Mays, Sharvil Desai, William R. Barnes, Behnam Pourdeyhimi and Michael D. Dickey

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/adfm.201202405

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      The fabrication and characterization of fibers that are ultrastretchable and have metallic electrical conductivity are described. The fibers consist of a liquid metal alloy, eutectic gallium indium (EGaIn), injected into the core of stretchable hollow fibers composed of a triblock copolymer, poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) resin. The hollow fibers are easy to mass-produce with controlled size by using commercially available melt processing methods.

    12. Soft Supracrystals of Au Nanocrystals with Tunable Mechanical Properties (pages 2315–2321)

      Cong Yan, Imad Arfaoui, Nicolas Goubet and Marie-Paule Pileni

      Version of Record online: 9 JAN 2013 | DOI: 10.1002/adfm.201202563

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      Three-dimensional colloidal arrays of nanocrystals, called supracrystals, are expected to be robust materials with Young's moduli (E) of several gigapascals. The characterization of soft supracrystal films with E of 100–200 MPa is reported. Two different models are used to determine the Young's modulus and both confirm this result independently. Further studies reveal that the mechanical properties of supracrystals are tuned by the growth mechanism.

    13. A Controllable Synthesis of Rich Nitrogen-Doped Ordered Mesoporous Carbon for CO2 Capture and Supercapacitors (pages 2322–2328)

      Jing Wei, Dandan Zhou, Zhenkun Sun, Yonghui Deng, Yongyao Xia and Dongyuan Zhao

      Version of Record online: 7 DEC 2012 | DOI: 10.1002/adfm.201202764

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      A facile and controllable synthesis method for producing ordered mesoporous carbon with high surface area and high nitrogen content is demonstrated. The approach uses soluble resol and dicyandiamide as the carbon and nitrogen source, respectively, and Pluronic F127 copolymer as a soft template via a solvent evaporation-induced self-assembly process.

    14. Similar or Totally Different: The Control of Conjugation Degree through Minor Structural Modifications, and Deep-Blue Aggregation-Induced Emission Luminogens for Non-Doped OLEDs (pages 2329–2337)

      Jing Huang, Ning Sun, Yongqiang Dong, Runli Tang, Ping Lu, Ping Cai, Qianqian Li, Dongge Ma, Jingui Qin and Zhen Li

      Version of Record online: 4 DEC 2012 | DOI: 10.1002/adfm.201202639

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      Four 4,4′-bis(1,2,2-triphenylvinyl)biphenyl (BTPE) derivatives are successfully synthesized and used as emitters for the construction of non-doped deep-blue organic light-emitting diodes (OLEDs). By merging two simple tetraphenylethene (TPE) moieties through ortho-, meta-, or para- linkage positions, the conjugation length is effectively controlled to ensure deep-blue emission, compared to BTPE which has sky-blue emission.

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