Advanced Materials

Cover image for Vol. 26 Issue 23

June 18, 2014

Volume 26, Issue 23

Pages 3777–3978

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Biodegradable Electronics: Materials, Designs, and Operational Characteristics for Fully Biodegradable Primary Batteries (Adv. Mater. 23/2014) (page 3777)

      Lan Yin, Xian Huang, Hangxun Xu, Yanfeng Zhang, Jasper Lam, Jianjun Cheng and John A. Rogers

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470152

      Thumbnail image of graphical abstract

      Transient electronics is an emerging technology whose key attribute is the ability to physically disappear, with applications including temporary implants and environmental sensors. On page 3879, J. A. Rogers and co-workers show the design of a primary magnesium battery that can fully degrade, without harm, in biofluids or groundwater. Monolithically integrating cells yields battery packs with sufficient power to operate conventional LEDs and radio transmitters.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Nanogenerators: Transparent Flexible Graphene Triboelectric Nanogenerators (Adv. Mater. 23/2014) (page 3778)

      Seongsu Kim, Manoj Kumar Gupta, Keun Young Lee, Ahrum Sohn, Tae Yun Kim, Kyung-Sik Shin, Dohwan Kim, Sung Kyun Kim, Kang Hyuck Lee, Hyeon-Jin Shin, Dong-Wook Kim and Sang-Woo Kim

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470153

      Thumbnail image of graphical abstract

      Transparent, flexible graphene triboelectric nanogenerators, as a new energy-harvesting application of graphene, are successfully demonstrated by S.-W. Kim and co-workers on page 3918. The work function and friction are decisive factors in understanding the difference in output performance, and depend on the number of layers of graphene. A liquid-crystal display (LCD), lightemitting diodes (LEDs), and an electroluminescent (EL) display can be powered using the electrical power output of the graphene triboelectric nanogenerator without any external energy source.

  3. Back Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. You have free access to this content
      Nanodots: Ultrasmall NaGdF4 Nanodots for Efficient MR Angiography and Atherosclerotic Plaque Imaging (Adv. Mater. 23/2014) (page 3980)

      Huaiyong Xing, Shengjian Zhang, Wenbo Bu, Xiangpeng Zheng, Lijun Wang, Qingfeng Xiao, Dalong Ni, Jiamin Zhang, Liangping Zhou, Weijun Peng, Kuaile Zhao, Yanqing Hua and Jianlin Shi

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470157

      Thumbnail image of graphical abstract

      As shown by J. Shi, W. Bu, and co-workers on page 3867, ultrasmall NaGdF4 nanodots (ca. 2 nm) with diethylenetriaminepenta-acetic acid (DTPA) conjugation are synthesized for efficient magnetic resonance (MR) angiography. Impressively, the r1 value in magnetic resonance imaging (MRI) reaches up to 8.93 mM−1 s−1. The ultrasmall vessel lumen of a rabbit is lit up remarkably. After 3 h, atherosclerotic plaques can be discriminated clearly. This is quite favorable for the accurate early diagnosis of vascular pathema.

  4. Masthead

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Masthead: (Adv. Mater. 23/2014)

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470155

  5. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Contents: (Adv. Mater. 23/2014) (pages 3779–3787)

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470154

  6. Progress Reports

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. A Shape-Adaptive Thin-Film-Based Approach for 50% High-Efficiency Energy Generation Through Micro-Grating Sliding Electrification (pages 3788–3796)

      Guang Zhu, Yu Sheng Zhou, Peng Bai, Xian Song Meng, Qingshen Jing, Jun Chen and Zhong Lin Wang

      Article first published online: 1 APR 2014 | DOI: 10.1002/adma.201400021

      Thumbnail image of graphical abstract

      A thin-film-based micro-grating triboelectric nanogenerator (MG-TENG) is developed for conversion of mechanical energy at an efficiency of 50%. The MG-TENG generates a power density of 50 mW/cm2 and 15 W/cm3, making it a sufficient power supply to regular electronics, such as light bulbs. The scalable and cost-effective MG-TENG is practically applicable in not only harvesting various mechanical motions but also possibly power generation at a large scale.

  7. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Optical Fibers: The Optical Fiber Tip: An Inherently Light-Coupled Microscopic Platform for Micro- and Nanotechnologies (Adv. Mater. 23/2014) (page 3797)

      Gorgi Kostovski, Paul R. Stoddart and Arnan Mitchell

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470156

      Thumbnail image of graphical abstract

      The flat tip of an optical fibre is illustrated as an inherently light-coupled platform for micro- and nanostructures. The diversity of these structures includes metallic nanoarrays for SERS and plasmonics, MEMS for Fabry–Perot pressure sensors and AFM probes, and entirely selfcontained silicon-photonic circuits. This broad field is reviewed in detail by G Kostovski and co-workers on page 3798.

  8. Reviews

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. The Optical Fiber Tip: An Inherently Light-Coupled Microscopic Platform for Micro- and Nanotechnologies (pages 3798–3820)

      Gorgi Kostovski, Paul R. Stoddart and Arnan Mitchell

      Article first published online: 5 MAR 2014 | DOI: 10.1002/adma.201304605

      Thumbnail image of graphical abstract

      The tip of the optical fiber is a compelling microscopic substrate for miniaturized photonic devices. This article reviews approaches for fabricating 2D and 3D micro and nanostructures on the fiber tip. Techniques include self-assembly, through-fiber patterning, photolithography, interference lithography, nanoimprinting, EBL, FIB, and hybrid micro- and nanotransfer techniques. Applications including pressure sensors, enhanced optical coupling, SNOM, SERS, AFM, and lab-on-a-tip. Potential for mass fabrication and commercialization is also discussed.

    2. Molecular Materials for Organic Photovoltaics: Small is Beautiful (pages 3821–3838)

      Jean Roncali, Philippe Leriche and Philippe Blanchard

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adma.201305999

      Thumbnail image of graphical abstract

      Various classes of molecules used as donor materials in heterojunction organic solar cells are presented. Special emphasis is placed on molecular structures that combine low molecular weight, (in general inferior to 500) structural simplicity and synthetic accessibility with reasonable yield. Such systems are discussed as possible working structures for the development of simple and cost-effective materials for organic photovoltaics.

  9. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Increased Open-Circuit Voltage of Organic Solar Cells by Reduced Donor-Acceptor Interface Area (pages 3839–3843)

      Koen Vandewal, Johannes Widmer, Thomas Heumueller, Christoph J. Brabec, Michael D. McGehee, Karl Leo, Moritz Riede and Alberto Salleo

      Article first published online: 24 MAR 2014 | DOI: 10.1002/adma.201400114

      Thumbnail image of graphical abstract

      The charge carrier lifetime in small molecule: C60 photovoltaic devices is increased by reducing the physical interface area availabe for recombination. For donor contents below 10%, the gain in open-circuit voltage (Voc) depends logarithmically on the interface area while the energy of the interfacial charge-transfer state ECT remains invariant.

    2. Highly Efficient Organic Light-Emitting Diodes with Phosphorescent Emitters Having High Quantum Yield and Horizontal Orientation of Transition Dipole Moments (pages 3844–3847)

      Kwon-Hyeon Kim, Chang-Ki Moon, Jeong-Hwan Lee, Sei-Yong Kim and Jang-Joo Kim

      Article first published online: 8 APR 2014 | DOI: 10.1002/adma.201305733

      Thumbnail image of graphical abstract

      Ancillary ligands in heteroleptic iridium complexes significantly influence the orientation of the transition dipole moments. Ir(ppy)3, a homoleptic iridium complex, exhibits isotropic dipole orientation, whereas the heteroleptic Ir complexes of Ir(ppy)2tmd show a highly preferred dipole orientation (78%) in the horizontal direction. In addition, we demonstrate an unprecedented highly efficient green OLED exhibiting an EQE of 32.3% and a power efficiency of 142.5 lm/W by using an emitter with high quantum yield and horizontally oriented dipoles.

    3. High-Performance Pseudocubic Thermoelectric Materials from Non-cubic Chalcopyrite Compounds (pages 3848–3853)

      Jiawei Zhang, Ruiheng Liu, Nian Cheng, Yubo Zhang, Jihui Yang, Ctirad Uher, Xun Shi, Lidong Chen and Wenqing Zhang

      Article first published online: 1 APR 2014 | DOI: 10.1002/adma.201400058

      Thumbnail image of graphical abstract

      The pseudocubic approach is a new strategy to realize good electronic transport properties and a high thermoelectric figure of merit zT in non-cubic chalcopyrites through the utilization of cubic-like degenerate electronic bands, via the coexistence of a long-range cubic framework with short-range non-cubic lattice distortions.

    4. Layered SnS2-Reduced Graphene Oxide Composite – A High-Capacity, High-Rate, and Long-Cycle Life Sodium-Ion Battery Anode Material (pages 3854–3859)

      Baihua Qu, Chuze Ma, Ge Ji, Chaohe Xu, Jing Xu, Ying Shirley Meng, Taihong Wang and Jim Yang Lee

      Article first published online: 27 MAR 2014 | DOI: 10.1002/adma.201306314

      Thumbnail image of graphical abstract

      A layered SnS2-reduced graphene oxide (SnS2-RGO) composite is prepared by a facile hydrothermal route and evaluated as an anode material for sodium-ion batteries (NIBs). The measured electrochemical properties are a high charge specific capacity (630 mAh g−1 at 0.2 A g−1) coupled to a good rate performance (544 mAh g−1 at 2 A g−1) and long cycle-life (500 mAh g−1 at 1 A g−1 for 400 cycles).

    5. Phase Transitions in the Brominated Ferroelectric Tris-Sarcosine Calcium Chloride (pages 3860–3866)

      J. C. Lashley, J. H. D. Munns, M. Echizen, M. N. Ali, S. E. Rowley and J. F. Scott

      Article first published online: 2 MAY 2014 | DOI: 10.1002/adma.201305065

      Thumbnail image of graphical abstract

      We demonstrate that the Curie temperature, Tc, of tris-sarcosine calcium chloride can be lowered from 130 K to near 0 K by chemical doping of the anion. In the low temperature limit, quantum fluctuations persist over a range of chemical doping concentrations. Below TC the temperature dependence of the fractional length change, inline image, scales as inline image (red line) where t is the reduced temperature, and λ = -1.5. The behavior of linear coefficient of thermal expansion near TC is shown in the inset. Three additional phase transitions near 43, 50, and 61 K are resolved.

    6. Ultrasmall NaGdF4 Nanodots for Efficient MR Angiography and Atherosclerotic Plaque Imaging (pages 3867–3872)

      Huaiyong Xing, Shengjian Zhang, Wenbo Bu, Xiangpeng Zheng, Lijun Wang, Qingfeng Xiao, Dalong Ni, Jiamin Zhang, Liangping Zhou, Weijun Peng, Kuaile Zhao, Yanqing Hua and Jianlin Shi

      Article first published online: 20 FEB 2014 | DOI: 10.1002/adma.201305222

      Thumbnail image of graphical abstract

      Herein, ultrasmall NaGdF4 nanodots (~2 nm) with DTPA conjugation have been synthesized for efficient MR angiography. Impressively, the r1 value in MRI reaches up to 8.93 mM−1·s−1. The ultrasmall vessel lumen of a rabbit is lighted up remarkably. After 3 h, atherosclerotic plaques could be discriminated clearly. This is beneficial for the accurate early diagnosis of vascular pathema.

  10. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Organic Electrochemical Transistors: Electrocardiographic Recording with Conformable Organic Electrochemical Transistor Fabricated on Resorbable Bioscaffold (Adv. Mater. 23/2014) (page 3873)

      Alessandra Campana, Tobias Cramer, Daniel T. Simon, Magnus Berggren and Fabio Biscarini

      Article first published online: 12 JUN 2014 | DOI: 10.1002/adma.201470165

      Thumbnail image of graphical abstract

      Conformable organic electrochemical transistors are fabricated on a resorbable bioscaffold, as discussed by F. Biscarini, T. Cramer, and co-workers on page 3874. The devices show a fast and sensitive transistorcurrent response to electrophysiological potential changes and allow the recording of the human electrocardiogram. The result paves the way for new types of bioelectronic interfaces with reduced invasiveness due to bioresorption and soft mechanical properties.

  11. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Back Cover
    5. Masthead
    6. Contents
    7. Progress Reports
    8. Frontispiece
    9. Reviews
    10. Communications
    11. Frontispiece
    12. Communications
    1. Electrocardiographic Recording with Conformable Organic Electrochemical Transistor Fabricated on Resorbable Bioscaffold (pages 3874–3878)

      Alessandra Campana, Tobias Cramer, Daniel T. Simon, Magnus Berggren and Fabio Biscarini

      Article first published online: 18 MAR 2014 | DOI: 10.1002/adma.201400263

      Thumbnail image of graphical abstract

      Organic electrochemical transistors are fabricated on a poly(L-lactide-co-glycolide) substrate. Fast and sensitive performance of the transistors allows recording of the electrocardiogram. The result paves the way for new types of bioelectronic interfaces with reduced invasiveness due to bioresorption and soft mechanical properties.

    2. Materials, Designs, and Operational Characteristics for Fully Biodegradable Primary Batteries (pages 3879–3884)

      Lan Yin, Xian Huang, Hangxun Xu, Yanfeng Zhang, Jasper Lam, Jianjun Cheng and John A. Rogers

      Article first published online: 20 MAR 2014 | DOI: 10.1002/adma.201306304

      Thumbnail image of graphical abstract

      Biodegradable electronics represent an emerging class of technology with potential to provide advanced semiconductor functionality in temporary biomedical implants. This work reported a biodegradable primary battery as a potential power source for these systems, which uses biodegradable metal foils and polyanhydride packages. Monolithically integrating cells yields battery packs with sufficient power to operate conventional light emitting diodes and radio transmitters.

    3. Impact of the Mechanical Stress on Switching Characteristics of Electrochemical Resistive Memory (pages 3885–3892)

      Stefano Ambrogio, Simone Balatti, Seol Choi and Daniele Ielmini

      Article first published online: 26 MAR 2014 | DOI: 10.1002/adma.201306250

      Thumbnail image of graphical abstract

      Electrochemical memory (ECM) shows a marked asymmetric switching due to the different ionic energy barriers under a positive or negative voltage. The switching asymmetry can be explained by the mechanical-stress gradient aiding the CF retraction under negative erase. CF stabilization is demonstrated by increasing the program pulse width, suggesting the alleviation of the stress field through electrically induced relaxation and allowing reliable ECM storage to be achieved.

    4. Two Types of Martensitic Phase Transformations in Magnetic Shape Memory Alloys by In-Situ Nanoindentation Studies (pages 3893–3898)

      Y. Liu, I. Karaman, H. Wang and X. Zhang

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adma.201400217

      Thumbnail image of graphical abstract

      A reversible gradual L21-to-10M/14M phase transformation at low stress is shown via in-situ nanoindentation on a single crystalline Ni54Fe19Ga27 alloy. At higher stress, an irreversible abrupt transition from residual L21 to L10 martensite (a 2nd type of phase transformation) occurrs. This study provides new perspectives for understanding stress induced phase transformations in magnetic shape memory alloys.

    5. Nanomesh-Structured Ultrathin Membranes Harnessing the Unidirectional Alignment of Viruses on a Graphene-Oxide Film (pages 3899–3904)

      Yong Man Lee, Bokyung Jung, Young Hun Kim, A. Reum Park, Sungsoo Han, Woo-Seok Choe and Pil J. Yoo

      Article first published online: 20 MAR 2014 | DOI: 10.1002/adma.201305862

      Thumbnail image of graphical abstract

      Ultrathin membranes of M13 viruses are demonstrated. Genetically engineered viruses are first selectively bound on the edges of graphene-oxide nanosheets. Further applying a shear flow on the assembled viruses results in their unidirectional alignment with a constant interspacing. These unit viral layers are stacked such that each layer is perpendicular to the preceding layer, forming a nanomesh structure, which is utilized for the separation of nanoparticles.

    6. High-Performance Biodegradable/Transient Electronics on Biodegradable Polymers (pages 3905–3911)

      Suk-Won Hwang, Jun-Kyul Song, Xian Huang, Huanyu Cheng, Seung-Kyun Kang, Bong Hoon Kim, Jae-Hwan Kim, Sooyoun Yu, Yonggang Huang and John A. Rogers

      Article first published online: 1 APR 2014 | DOI: 10.1002/adma.201306050

      Thumbnail image of graphical abstract

      Materials and fabrication approaches that allow integration of biodegradable/transient electronics onto diverse classes of biodegradable substrates are presented in this article. By first depositing, patterning, and etching the materials for the electronics and then integrating them on a substrate of interest, it is possible to use nearly any type of biodegradable material for this purpose. Component and system-level studies of various devices and biodegradable polymers illustrate the capabilities and operational aspects. Dissolution studies and mechanics modeling results highlight different modes for transient behavior.

    7. Spatiotemporally Controllable and Cytocompatible Approach Builds 3D Cell Culture Matrix by Photo-Uncaged-Thiol Michael Addition Reaction (pages 3912–3917)

      Zhenzhen Liu, Qiuning Lin, Yun Sun, Tao Liu, Chunyan Bao, Fuyou Li and Linyong Zhu

      Article first published online: 20 MAR 2014 | DOI: 10.1002/adma.201306061

      Thumbnail image of graphical abstract

      A new concept of photocrosslinking mechanism is developed to construct a 3D cell culture matrix based on a photo-uncaged-thiol Michael addition. This first-class approach not only provides highly cytocompatible gelation in a spatiotemporally controlled manner, but also controls gel stiffness via appropriate light dose, signaling desired cues to live cells and thus important to bioengineering and regenerative medicine.

    8. Transparent Flexible Graphene Triboelectric Nanogenerators (pages 3918–3925)

      Seongsu Kim, Manoj Kumar Gupta, Keun Young Lee, Ahrum Sohn, Tae Yun Kim, Kyung-Sik Shin, Dohwan Kim, Sung Kyun Kim, Kang Hyuck Lee, Hyeon-Jin Shin, Dong-Wook Kim and Sang-Woo Kim

      Article first published online: 28 MAR 2014 | DOI: 10.1002/adma.201400172

      Thumbnail image of graphical abstract

      Transparent flexible graphene triboelectric nanogenerators as new promising applications of chemical vapor deposition-grown graphene are successfully demonstrated. The work function and friction are decisive factors to understand the difference in output performance depending on the number of layers of graphene. In this work, we were able to power an LCD, LEDs, and an EL display using the electrical power output of the graphene triboelectric nanogenerator without any external energy source.

    9. Preparation and Biofunctionalization of Multicolor Conjugated Polymer Nanoparticles for Imaging and Detection of Tumor Cells (pages 3926–3930)

      Liheng Feng, Libing Liu, Fengting Lv, Guillermo C. Bazan and Shu Wang

      Article first published online: 18 MAR 2014 | DOI: 10.1002/adma.201305206

      Thumbnail image of graphical abstract

      Multicolor conjugated polymer nano­particles (CPNs) are designed and biofunctionalized with antibody for targeted cell imaging and cell detection. In comparison to single-antibody recognition mode to tumor cells, enhanced specificity for targeted imaging and detection of tumor cells is achieved by binding two antibody functionalized CPNs to one tumor cell. This strategy provides a new platform for designing CPNs useful for targeted imaging, cells detection and other biological applications.

    10. Tunable Plasmon Resonances in Two-Dimensional Molybdenum Oxide Nanoflakes (pages 3931–3937)

      Manal M. Y. A. Alsaif, Kay Latham, Matthew R. Field, David D. Yao, Nikhil V. Medehkar, Gary A. Beane, Richard B. Kaner, Salvy P. Russo, Jian Zhen Ou and Kourosh Kalantar-zadeh

      Article first published online: 26 MAR 2014 | DOI: 10.1002/adma.201306097

      Thumbnail image of graphical abstract

      Tunable plasmon resonances in suspended 2D molybdenum oxide flakes are demonstrated. The 2D configuration generates a large depolarization factor and the presence of ultra-doping produces visible-light plasmon resonances. The ultra-doping process is conducted by reducing the semiconducting 2D MoO3 flakes using simulated solar irradiation. The generated plasmon resonances can be controlled by the doping levels and the flakes’ lateral dimensions, as well as by exposure to a model protein.

    11. Heat- or Water-Driven Malleability in a Highly Recyclable Covalent Network Polymer (pages 3938–3942)

      Philip Taynton, Kai Yu, Richard K. Shoemaker, Yinghua Jin, H. Jerry Qi and Wei Zhang

      Article first published online: 27 MAR 2014 | DOI: 10.1002/adma.201400317

      Thumbnail image of graphical abstract

      A catalyst-free malleable network polymer that can be reprocessed by application of either water or heat is prepared through imine chemistry. This material is recycled from a fine powder to a coherent solid with >100% recycling efficiency through several generations. It is also reprocessed at ambient temperature using only water, thus potentially leading to energy-neutral green processing of the material.

    12. Ultra-Uniform SnOx/Carbon Nanohybrids toward Advanced Lithium-Ion Battery Anodes (pages 3943–3949)

      Xiaosi Zhou, Zhihui Dai, Shuhu Liu, Jianchun Bao and Yu-Guo Guo

      Article first published online: 24 MAR 2014 | DOI: 10.1002/adma.201400173

      Thumbnail image of graphical abstract

      Ultra-uniform SnOx/carbon nanohybrids for lithium-ion batteries are successfully prepared by solvent replacement and subsequent electrospinning. The resulting 1D nanostructure with Sn-N bonding between the SnOx and N-containing carbon nanofiber matrix can not only tolerate the substantial volume change and suppress the aggregation of SnOx, but also enhances the transport of both electrons and ions for the embedded SnOx, thus leading to high cycling performance and rate capability.

    13. Synthesis of Monodispere Au@Co3O4 Core-Shell Nanocrystals and Their Enhanced Catalytic Activity for Oxygen Evolution Reaction (pages 3950–3955)

      Zhongbin Zhuang, Wenchao Sheng and Yushan Yan

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adma.201400336

      Thumbnail image of graphical abstract

      Novel OER catalysts – monodisperse Au@Co3O4 core-shell nanocrystals – have been prepared by synthesizing Au nanocrystals, followed by deposition of Co shells and their conversion to Co3O4 shells. Owing to the synergistic effect, Au@Co3O4 nanocrystals have an OER activity 7 times as high as a Au and Co3O4 nanocrystals mixture or Co3O4 nanocrystals alone, and 55 times as high as Au nanocrystals alone.

    14. Optically Tunable Magneto-Capacitance Phenomenon in Organic Semiconducting Materials Developed by Electrical Polarization of Intermolecular Charge-Transfer States (pages 3956–3961)

      Lei He, Mingxing Li, Augustine Urbas and Bin Hu

      Article first published online: 21 MAR 2014 | DOI: 10.1002/adma.201305965

      Thumbnail image of graphical abstract

      Optically tunable magneto-capacitance can be developed by using photo-generated intermolecular charge-transfer (CT) states in an organic donor:acceptor (TPD:BBOT) composite through magnetic field-dependent singlet/triplet ratio and singlet/triplet ratio-dependent electrical polarization. The magnitude and line shape of the magneto-capacitance can be readily tuned by changing the density of intermolecular CT states.

    15. Ultra-thin 3D Nano-Devices from Atomic Layer Deposition on Polyimide (pages 3962–3967)

      Nathan T. Eigenfeld, Jason M. Gray, Joseph J. Brown, George D. Skidmore, Steven M. George and Victor M. Bright

      Article first published online: 1 APR 2014 | DOI: 10.1002/adma.201400410

      Thumbnail image of graphical abstract

      A new nanofabrication process for nano/micro-devices through the combination of inorganic nanomaterials from atomic layer deposition (ALD) on 3-dimensional organic polyimide substrates is developed. The first suspended ALD structures with multiple patterned suspended levels on the order of 10 nm are fabricated and results surrounding the mechanical stability of ultra-thin suspended structures are discussed.

    16. Flexible Molecular-Scale Electronic Devices Composed of Diarylethene Photoswitching Molecules (pages 3968–3973)

      Dongku Kim, Hyunhak Jeong, Hanki Lee, Wang-Taek Hwang, Jannic Wolf, Elke Scheer, Thomas Huhn, Heejun Jeong and Takhee Lee

      Article first published online: 31 MAR 2014 | DOI: 10.1002/adma.201306316

      Thumbnail image of graphical abstract

      The electrical properties of diarylethene photoswitching molecular devices on flexible substrates are studied. When exposed to UV or visible light, diarylethene molecular devices show two electrical states (a high and a low conductance state) with a discrepancy of an order of magnitude in the level of current between the two states. The diarylethene flexible molecular devices exhibit excellent long-time stability and reliable electrical characteristics in both conductance states when subjected to various mechanical stresses.

    17. High Thermoelectric Performance in Non-Toxic Earth-Abundant Copper Sulfide (pages 3974–3978)

      Ying He, Tristan Day, Tiansong Zhang, Huili Liu, Xun Shi, Lidong Chen and G. Jeffrey Snyder

      Article first published online: 26 MAR 2014 | DOI: 10.1002/adma.201400515

      Thumbnail image of graphical abstract

      A new type of high performance thermoelectric material Cu2-xS composed of non-toxic and earth-abundant elements Cu and S is reported. Cu2-xS surprisingly has lower thermal conductivity and more strikingly reduced specific heat compared to the heavier Cu2Se, leading to an increased zT to 1.7.

SEARCH

SEARCH BY CITATION