Advanced Functional Materials

Cover image for Vol. 23 Issue 24

June 25, 2013

Volume 23, Issue 24

Pages 3017–3129

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      Electrodes: Bench-Top Fabrication of Hierarchically Structured High-Surface-Area Electrodes (Adv. Funct. Mater. 24/2013) (page 3017)

      Christine M. Gabardo, Yujie Zhu, Leyla Soleymani and Jose M. Moran-Mirabal

      Version of Record online: 18 JUN 2013 | DOI: 10.1002/adfm.201370118

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      Hierarchically structured materials hold great potential in biosensing, energy storage, photovoltaics, and tissue engineering. On page 3030, Leyla Soleymani, Jose M. Moran-Mirabal, and co-workers present a rapid, facile, and inexpensive approach to fabricate electrodes with hierarchical features spanning from the millimeter to the nanometer scale. The image depicts the tunable topographies obtained using this method through the stress-driven crumpling of gold films.

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      Biomedical Applications: Imaging-Guided pH-Sensitive Photodynamic Therapy Using Charge Reversible Upconversion Nanoparticles under Near-Infrared Light (Adv. Funct. Mater. 24/2013) (page 3018)

      Chao Wang, Liang Cheng, Yumeng Liu, Xiaojing Wang, Xinxing Ma, Zhaoyi Deng, Yonggang Li and Zhuang Liu

      Version of Record online: 18 JUN 2013 | DOI: 10.1002/adfm.201370119

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      Smart charge-reversible upconversion nanoparticles are reported on page 3077 by Zhuang Liu and co-workers for pH-responsive, in vivo, near-infrared light excited photodynamic therapy. While stable under normal physiological pH, highly sensitive acid-induced charge conversion of the nanoparticles is observed in a slightly acidic tumor microenvironment, resulting in significantly enhanced cellular internalization of nanoparticles and remarkably improved photodynamic cancer cell killing in vitro and in vivo.

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      Masthead: (Adv. Funct. Mater. 24/2013)

      Version of Record online: 18 JUN 2013 | DOI: 10.1002/adfm.201370120

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  5. Correction

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      Correction: Liquid-Crystalline Perylene Diester Polymers with Tunable Charge-Carrier Mobility (page 3023)

      Mathis-Andreas Muth, Miguel Carrasco-Orozco and Mukundan Thelakkat

      Version of Record online: 18 JUN 2013 | DOI: 10.1002/adfm.201301538

      This article corrects:

      Liquid-Crystalline Perylene Diester Polymers with Tunable Charge-Carrier Mobility

      Vol. 21, Issue 23, 4510–4518, Version of Record online: 21 OCT 2011

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    1. Origins of Low Quantum Efficiencies in Quantum Dot LEDs (pages 3024–3029)

      Deniz Bozyigit, Olesya Yarema and Vanessa Wood

      Version of Record online: 22 JAN 2013 | DOI: 10.1002/adfm.201203191

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      The quantum yield (QY) of CdSe/CdS core/shell colloidal quantum dots (QD) is reduced exponentially with increasing electric field (Fqd). This reduction is more pronounced with thicker shells and is due to the reduced overlap between electron and hole wavefunctions. This has strong implications for the use of QDs in opto-electronic applications, where electric field strengths can readily exceed 1 MV cm−1.

    2. Bench-Top Fabrication of Hierarchically Structured High-Surface-Area Electrodes (pages 3030–3039)

      Christine M. Gabardo, Yujie Zhu, Leyla Soleymani and Jose M. Moran-Mirabal

      Version of Record online: 17 JAN 2013 | DOI: 10.1002/adfm.201203220

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      A rapid, facile, and inexpensive method to fabricate hierarchically structured gold electrodes that present high surface areas is presented. The combination of vinyl film masking, stress-driven wrinkling, and electrodeposition allows the rapid prototyping of electrode designs. The fabricated electrodes are robust, highly reproducible, perform well in electrochemical measurements, and demonstrate up to 1000% enhancements in electroactive surface area.

    3. Matrix Metalloproteinase Responsive, Proximity-Activated Polymeric Nanoparticles for siRNA Delivery (pages 3040–3052)

      Hongmei Li, Shann S. Yu, Martina Miteva, Christopher E. Nelson, Thomas Werfel, Todd D. Giorgio and Craig L. Duvall

      Version of Record online: 6 FEB 2013 | DOI: 10.1002/adfm.201202215

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      A pH-responsive, smart polymeric nanocarrier (SPN) with matrix metalloproteinase (MMP)-7-dependent proximity-activated targeting (PAT) incorporates polyethylene glycol (PEG) shielding that is removable in MMP-7-rich environments (e.g., breast cancer metastases). The up-regulated MMP-7 activity in pathological tissue exposes the cationic component of the SPN polymer, triggering cell uptake. Following internalization of polymers into the endosomal pathway, pH-dependent endosomal escape facilitates cytosolic siRNA delivery.

    4. Self-Assembly of π-Conjugated Amphiphiles: Free Standing, Ordered Sheets with Enhanced Mobility (pages 3053–3060)

      Bhawani Narayan, Satyaprasad P. Senanayak, Ankit Jain, K. S. Narayan and Subi J. George

      Version of Record online: 17 JAN 2013 | DOI: 10.1002/adfm.201202298

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      An amphiphilic design and solution-state self-assembly of π-conjugated systems results in free-standing, nanostructured sheets with green fluorescence. Highly ordered, lamellar molecular organization in the sheets leads to good mobility when transferred on to a field-effect transistor device.

    5. Cyclobutadiene–C60 Adducts: N-Type Materials for Organic Photovoltaic Cells with High VOC (pages 3061–3069)

      Ggoch Ddeul Han, William R. Collins, Trisha L. Andrew, Vladimir Bulović and Timothy M. Swager

      Version of Record online: 16 JAN 2013 | DOI: 10.1002/adfm.201203251

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      Cofacial π-orbital interactions between the fullerene and the cyclobutene addend are shown to decrease the electron affinity and thereby increase the lowest unoccupied molecular orbital (LUMO) energy level of C60 significantly. The increased LUMO level of fullerene can be used to generate higher open-circuit voltages and a comparable power conversion efficiency relative to the widely used P3HT/PCBM composite.

    6. Microstructured Nematic Liquid Crystalline Elastomer Surfaces with Switchable Wetting Properties (pages 3070–3076)

      Zi Liang Wu, Axel Buguin, Hong Yang, Jean-Marie Taulemesse, Nicolas Le Moigne, Anne Bergeret, Xiaogong Wang and Patrick Keller

      Version of Record online: 24 JAN 2013 | DOI: 10.1002/adfm.201203291

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      Microstructured liquid crystalline elastomer surfaces covered with micropillar arrays are developed using a replica molding technique. When modulating the temperature, the contraction of the pillars along their long axis induces a roughness change and therefore a change of the wetting properties of the microstructured surfaces.

    7. Imaging-Guided pH-Sensitive Photodynamic Therapy Using Charge Reversible Upconversion Nanoparticles under Near-Infrared Light (pages 3077–3086)

      Chao Wang, Liang Cheng, Yumeng Liu, Xiaojing Wang, Xinxing Ma, Zhaoyi Deng, Yonggang Li and Zhuang Liu

      Version of Record online: 31 JAN 2013 | DOI: 10.1002/adfm.201202992

      Thumbnail image of graphical abstract

      Smart charge-reversible upconversion nanoparticles are developed for pH-responsive in vivo near-infrared light -excited photodynamic therapy. While stable under normal physiological pH, highly sensitive acid-induced charge conversion of those nanoparticles is observed in slightly acidic tumor microenvironments, resulting in significantly enhanced cellular internalization of nanoparticles and remarkably improved photodynamic cancer-cell killing efficacy.

    8. Spray Layer-by-Layer Electrospun Composite Proton Exchange Membranes (pages 3087–3095)

      David S. Liu, J. Nathan Ashcraft, Matthew M. Mannarino, Meredith N. Silberstein, Avni A. Argun, Gregory C. Rutledge, Mary C. Boyce and Paula T. Hammond

      Version of Record online: 18 JAN 2013 | DOI: 10.1002/adfm.201202892

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      Polymer electrolyte films are deposited onto highly porous electrospun mats using layer-by-layer (LbL) processing to fabricate composite proton conducting membranes. Various dip and spray processing techniques are investigated for different and unique composite film morphologies. By combining the different spray-LbL fabrication techniques with electrospun fiber supports and tuning the parameters, mechanically stable membranes with high selectivity can be produced.

    9. Fluorene-Based Asymmetric Bipolar Universal Hosts for White Organic Light Emitting Devices (pages 3096–3105)

      Ejabul Mondal, Wen-Yi Hung, Hung-Chi Dai and Ken-Tsung Wong

      Version of Record online: 22 JAN 2013 | DOI: 10.1002/adfm.201202889

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      A new bipolar host molecule (CzFCN) configuring hole-transporting carbazole and electron-transporting cyano-substituted fluorene via a saturated carbon center is utilized to realize highly efficient electrophosphorescent blue, green, yellowish-green, yellow, red, and white devices using a common device structure.

    10. An Analytical Model of Reactive Diffusion for Transient Electronics (pages 3106–3114)

      Rui Li, Huanyu Cheng, Yewang Su, Suk-Won Hwang, Lan Yin, Hu Tao, Mark A. Brenckle, Dae-Hyeong Kim, Fiorenzo G. Omenetto, John A. Rogers and Yonggang Huang

      Version of Record online: 21 JAN 2013 | DOI: 10.1002/adfm.201203088

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      Transient electronics are designed to be stable and fully functional during their lifetimes, but then completely disappear in water or biofluids at prescribed rates and at programmed times. Analytical models are established for the dissolution of constituent materials in transient electronic systems, and they provide important design tools for transient electronics.

    11. Molecularly Imprinted Polymer Grafted Porous Au-Paper Electrode for an Microfluidic Electro-Analytical Origami Device (pages 3115–3123)

      Lei Ge, Shoumei Wang, Jinghua Yu, Nianqiang Li, Shenguang Ge and Mei Yan

      Version of Record online: 18 JAN 2013 | DOI: 10.1002/adfm.201202785

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      A molecular imprinting technique is introduced into a lab-on-paper device through electropolymerization of molecularly imprinted polymer in a novel Au nanoparticle (AuNP) modified paper working electrode. This is fabricated through the growth of AuNP layers on the surfaces of cellulose fibers to enhance the conductivity of the cellulose fibers in the paper and, as a result, increase the effective surface area of the electrode.

    12. Nano-Imprinted Ferroelectric Polymer Nanodot Arrays for High Density Data Storage (pages 3124–3129)

      Xiang-Zhong Chen, Qian Li, Xin Chen, Xu Guo, Hai-Xiong Ge, Yun Liu and Qun-Dong Shen

      Version of Record online: 17 JAN 2013 | DOI: 10.1002/adfm.201203042

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      Ferroelectric polymer [P(VDF-TrFE)] free-standing nanodot arrays with ultrahigh data storage density are fabricated through nano-imprinting. The preferred orientation of the copolymer chains in the nanodot arrays is favorable for polarization switching of single nanodots. This approach allows nanometer electronic features to be written directly in two dimensions by piezoresponse force microscopy probe based technology.

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