Advanced Functional Materials

Cover image for Vol. 23 Issue 33

September 6, 2013

Volume 23, Issue 33

Pages 4061–4162

  1. Cover Picture

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    4. Back Cover
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      Organic Light Emitting Diodes: Low Roll-Off and High Efficiency Orange Organic Light Emitting Diodes with Controlled Co-Doping of Green and Red Phosphorescent Dopants in an Exciplex Forming Co-Host (Adv. Funct. Mater. 33/2013) (page 4061)

      Sunghun Lee, Kwon-Hyeon Kim, Daniel Limbach, Young-Seo Park and Jang-Joo Kim

      Article first published online: 3 SEP 2013 | DOI: 10.1002/adfm.201370163

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      A bright orange emission is observed from a combination of red and green emitters. Jang-Joo Kim and co-workers report on page 4105 the creation of orange organic light-emitting diodes using an advanced quasi-host and quasi-emitter concept, where green and red phosphorescent dopants are doped into an exciplex-forming host, realizing a high external quantum efficiency, low driving voltage, and low roll-off efficiency at the same time.

  2. Inside Front Cover

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      Drug Delivery: Multifunctional Up-Converting Nanocomposites with Smart Polymer Brushes Gated Mesopores for Cell Imaging and Thermo/pH Dual-Responsive Drug Controlled Release (Adv. Funct. Mater. 33/2013) (page 4062)

      Xiao Zhang, Piaoping Yang, Yunlu Dai, Ping'an Ma, Xuejiao Li, Ziyong Cheng, Zhiyao Hou, Xiaojiao Kang, Chunxia Li and Jun Lin

      Article first published online: 3 SEP 2013 | DOI: 10.1002/adfm.201370164

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      On page 4067, Z. Cheng, J. Lin, and co-workers report the synthesis of a multifunctional nanocomposite as an anticancer drug carrier based on a NaYF4:Yb3+/Er3+ core and mesoporous silica shell with thermo/pH-coupled sensitive polymer brushes grafted onto the silica surface as gate molecules. The particles can be used as fluorescent upconverters for cell imaging, and the drug release property can be promoted either by decreasing the pH to match the acidic tumor environment or by NIR laser irradiation.

  3. Back Cover

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      Supercapacitors: Superior Micro-Supercapacitors Based on Graphene Quantum Dots (Adv. Funct. Mater. 33/2013) (page 4164)

      Wen-Wen Liu, Ya-Qiang Feng, Xing-Bin Yan, Jiang-Tao Chen and Qun-Ji Xue

      Article first published online: 3 SEP 2013 | DOI: 10.1002/adfm.201370165

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      A new application of graphene quantum dots (GQDs) as an ideal electrode material for supercapacitors is explored by X.-B. Yan and co-workers. On page 4111 they build a GQD//GQD symmetric micro-supercapacitor and a GQD//MnO2 asymmetric supercapacitor. Both devices show excellent rate capabilities, exceptionally high-frequency responses, and long-term cycle stability.

  4. Masthead

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      Masthead: (Adv. Funct. Mater. 33/2013)

      Article first published online: 3 SEP 2013 | DOI: 10.1002/adfm.201370166

  5. Contents

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    4. Back Cover
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      Contents: (Adv. Funct. Mater. 33/2013) (pages 4063–4066)

      Article first published online: 3 SEP 2013 | DOI: 10.1002/adfm.201370167

  6. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Full Papers
    1. Multifunctional Up-Converting Nanocomposites with Smart Polymer Brushes Gated Mesopores for Cell Imaging and Thermo/pH Dual-Responsive Drug Controlled Release (pages 4067–4078)

      Xiao Zhang, Piaoping Yang, Yunlu Dai, Ping'an Ma, Xuejiao Li, Ziyong Cheng, Zhiyao Hou, Xiaojiao Kang, Chunxia Li and Jun Lin

      Article first published online: 27 MAR 2013 | DOI: 10.1002/adfm.201300136

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      Multifunctional nanocarriers based on up-conversion luminescent nanoparticles of NaYF4:Yb3+/Er3+ core (UCNPs) and thermo/pH-coupling sensitive polymer poly[(N-isopropylacrylamide)-co-(methacrylic acid)] brushes gated mesoporous silica shell are reported. They have applications in cancer theranostics, including fluorescence imaging, and for controlled drug release for therapy.

    2. Temperature-Insensitive (K,Na)NbO3-Based Lead-Free Piezoactuator Ceramics (pages 4079–4086)

      Ke Wang, Fang-Zhou Yao, Wook Jo, Danka Gobeljic, Vladimir V. Shvartsman, Doru C. Lupascu, Jing-Feng Li and Jürgen Rödel

      Article first published online: 19 MAR 2013 | DOI: 10.1002/adfm.201203754

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      The development of (K,Na)NbO3-based lead-free piezoceramics is attracting great interest because of growing environmental concerns. A material concept that yields an average piezoelectric coefficient, d33, of about 300 pC/N and a high level of unipolar strain up to 0.16% is reported. Most intriguingly, field-induced strain varies less than 10% from room temperature to 175 °C.

    3. Materials and Fabrication Processes for Transient and Bioresorbable High-Performance Electronics (pages 4087–4093)

      Suk-Won Hwang, Dae-Hyeong Kim, Hu Tao, Tae-il Kim, Stanley Kim, Ki Jun Yu, Bruce Panilaitis, Jae-Woong Jeong, Jun-Kyul Song, Fiorenzo G. Omenetto and John. A. Rogers

      Article first published online: 11 APR 2013 | DOI: 10.1002/adfm.201300127

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      Materials, designs, and integration techniques are presented for a class of water-soluble electronics capable of fabrication using wafer-based processes. The active components exploit biocompatible and bioresorbable materials that are capable of dissolution in biofluids. Characterization of the electronic properties of the devices, their kinetics for dissolution, and preliminary evaluations in animal models highlight key aspects of the materials and concepts.

    4. Diverse Organic Field-Effect Transistor Sensor Responses from Two Functionalized Naphthalenetetracarboxylic Diimides and Copper Phthalocyanine Semiconductors Distinguishable Over a Wide Analyte Range (pages 4094–4104)

      Weiguo Huang, Jasmine Sinha, Ming-Ling Yeh, Josué F. Martínez Hardigree, Rachel LeCover, Kalpana Besar, Ana María Rule, Patrick N. Breysse and Howard E. Katz

      Article first published online: 21 MAR 2013 | DOI: 10.1002/adfm.201300245

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      Naphthalenetetracarboxylic diimide derivatives (octyl “8” NTCDI, dimethylaminopropyl “DMP” NTCDI) and copper phthalocyanine (CuPc) are used to form a diverse organic field-effect transistor sensor array. The three-response patterns obtained from representative polar, nonpolar, acidic, and basic vapors are all different, showing the potential for this approach in rapid, low-cost electronic detection of volatile compounds.

    5. Low Roll-Off and High Efficiency Orange Organic Light Emitting Diodes with Controlled Co-Doping of Green and Red Phosphorescent Dopants in an Exciplex Forming Co-Host (pages 4105–4110)

      Sunghun Lee, Kwon-Hyeon Kim, Daniel Limbach, Young-Seo Park and Jang-Joo Kim

      Article first published online: 8 APR 2013 | DOI: 10.1002/adfm.201300187

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      An orange organic light emitting diode (OLED) with controlled co-doping of green and red phosphorescent dopants achieves a low turn-on voltage of 2.4 V and a very high EQE of 25.0%. The OLED demonstrates an external quantum efficiency over 21% at 10 000 cdm−2. The orange OLED displays a very good orange color (Commission Internationale d'Eclairage of (0.501, 0.478) at 1000 cdm−2) with very little color shift with increasing luminance.

    6. Superior Micro-Supercapacitors Based on Graphene Quantum Dots (pages 4111–4122)

      Wen-Wen Liu, Ya-Qiang Feng, Xing-Bin Yan, Jiang-Tao Chen and Qun-Ji Xue

      Article first published online: 26 MAR 2013 | DOI: 10.1002/adfm.201203771

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      Graphene quantum dots (GQDs)-based micro-supercapacitors are prepared using a simple eletrodeposition approach and their electrochemical properties in aqueous and ionic liquid electrolytes are studied. The GQDs-based micro-supercapacitors exhibit superior rate capability, high power response capability, and excellent cyclic stability

    7. Preparation of Iron Networks Hosted in Porous Alumina with Tunable Negative Permittivity and Permeability (pages 4123–4132)

      Zhi-cheng Shi, Run-hua Fan, Ke-lan Yan, Kai Sun, Meng Zhang, Cheng-guo Wang, Xiang-fa Liu and Xi-hua Zhang

      Article first published online: 15 MAR 2013 | DOI: 10.1002/adfm.201202895

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      Iron particles are hosted in porous alumina via a facile impregnation-reduction process. When the iron content exceeds the percolation threshold, iron networks are formed. The iron content and reduction temperature can easily tune the amplitude and frequency range of the negative permittivity and permeability. The impregnation-reduction process has great potential for the preparation of random composites with tunable double negative properties.

    8. Light Emission in the Unipolar Regime of Ambipolar Organic Field-Effect Transistors (pages 4133–4139)

      W. S. Christian Roelofs, Willem H. Adriaans, René A. J. Janssen, Martijn Kemerink and Dago M. de Leeuw

      Article first published online: 26 MAR 2013 | DOI: 10.1002/adfm.201203568

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      Light emission from ambipolar organic field-effect transistors is observed when they are operated in the unipolar regime. This counterintuitive unipolar light emission is quantitatively explained by injection of minority carriers into deep tail states of the semiconductor. The density of the injected minority carriers is small; they are relatively immobile and recombine close the contact with accumulated majority carriers.

    9. Nanomaterial-Based Fluorescent DNA Analysis: A Comparative Study of the Quenching Effects of Graphene Oxide, Carbon Nanotubes, and Gold Nanoparticles (pages 4140–4148)

      Fan Li, Hao Pei, Lihua Wang, Jianxin Lu, Jimin Gao, Bowei Jiang, Xingchun Zhao and Chunhai Fan

      Article first published online: 22 MAR 2013 | DOI: 10.1002/adfm.201203816

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      Three nanomaterials-based fluorescent biosensors are used for DNA detection in homogeneous solution. The quenching efficiency, kinetics, differentiation ability, and influencing factors are studied, and graphene oxide (GO) exhibits the best performance, characterized by superior quenching abilities, limit of detection, and the highest discrimination for single-base mismatches

    10. Facile Fabrication of PbS Nanocrystal:C60 Fullerite Broadband Photodetectors with High Detectivity (pages 4149–4155)

      Rinku Saran, Muhammad N. Nordin and Richard J. Curry

      Article first published online: 11 MAR 2013 | DOI: 10.1002/adfm.201202818

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      PbS nanocrystal/C60 fullerite photodetectors exhibiting broadband UV-vis-near IR response with high detectivity are demonstrated using a simple one-step deposition process. The devices operate without the need of a transparent conducting substrate under ambient air conditions exhibiting a fast photocurrent rise time and a biexponential microsecond decay. These devices offer an attractive low-cost solution for large-area broadband photodetectors.

    11. A Core-Shell Nanoporous Pt-Cu Catalyst with Tunable Composition and High Catalytic Activity (pages 4156–4162)

      Xingbo Ge, Luyang Chen, Jianli Kang, Takeshi Fujita, Akihiko Hirata, Wei Zhang, Jianhua Jiang and Mingwei Chen

      Article first published online: 26 MAR 2013 | DOI: 10.1002/adfm.201300114

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      Using a potential-controlled dealloying approach, a core-shell nanoporous Pt-Cu bimetallic catalyst with a widely tunable Pt/Cu ratio is fabricated. The nanoporous Pt-Cu catalyst consists of a Pt-Cu alloy core and a pure Pt skin, showing high catalytic activities toward the oxygen reduction reaction and formic electro-oxidation.

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