Advanced Materials

Cover image for Vol. 23 Issue 28

July 26, 2011

Volume 23, Issue 28

Pages 3107–3219

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Communications
    6. Research News
    1. Electromechanical Responses: Nanoscale Structure and Mechanism for Enhanced Electromechanical Response of Highly Strained BiFeO3 Thin Films (Adv. Mater. 28/2011) (page 3107)

      Anoop R. Damodaran, Chen-Wei Liang, Qing He, Chun-Yen Peng, Li Chang, Ying-Hao Chu and Lane W. Martin

      Article first published online: 19 JUL 2011 | DOI: 10.1002/adma.201190106

      Thumbnail image of graphical abstract

      A rugged landscape for high-performance electromechanical responses is reported on p. 3170 by Lane W. Martin and co-workers. The cover image shows a high-resolution atomic force microscopy image of the complex surface structure of a highly strained BiFeO3 thin film. The presence of several structural variants in these films gives rise to exotic electric-field-induced responses and electromechanical responses as large as 5%.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Communications
    6. Research News
    1. Contents: (Adv. Mater. 28/2011) (pages 3109–3114)

      Article first published online: 19 JUL 2011 | DOI: 10.1002/adma.201190107

  3. Review

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Communications
    6. Research News
    1. Nanoscale Semiconductor “X” on Substrate “Y” – Processes, Devices, and Applications (pages 3115–3127)

      Morten Madsen, Kuniharu Takei, Rehan Kapadia, Hui Fang, Hyunhyub Ko, Toshitake Takahashi, Alexandra C. Ford, Min Hyung Lee and Ali Javey

      Article first published online: 10 JUN 2011 | DOI: 10.1002/adma.201101192

      Thumbnail image of graphical abstract

      Recent advancements in the integration of nanoscale semiconductor “X” on substrate “Y” (XoY) for use in transistor and sensor applications are presented. XoY is a generic materials framework for enabling the fabrication of various novel devices, without the constraints of the original growth substrates. Two specific XoY schemes based on top-down and bottom-up fabrication processes, along with their material, device and application implications are presented. The work is an example of “translational nano­technology” as it bridges basic science of nanomaterials with practical applications.

  4. Communications

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Communications
    6. Research News
    1. Morphology Optimization for the Fabrication of High Mobility Thin-Film Transistors (pages 3128–3133)

      Xiangnan Sun, Lei Zhang, Chong-an Di, Yugeng Wen, Yunlong Guo, Yan Zhao, Gui Yu and Yunqi Liu

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adma.201101178

      Thumbnail image of graphical abstract

      A novel method to enhance the perform­ance of pentacene thin-film transistors (TFTs) based on a blending polymeric dielectric is reported. By the inter-grain-enhancing process and the nucleation-controlling process, the morphology of pentacene has been optimized and the mobility of OTFT is enhanced up to 3.6 cm2/Vs. The mechanism of this technology is a “heterogeneity-employed” method, which is absolutely different from conventional “homogeneity-aimed” methods.

    2. Depleted Bulk Heterojunction Colloidal Quantum Dot Photovoltaics (pages 3134–3138)

      D. Aaron R. Barkhouse, Ratan Debnath, Illan J. Kramer, David Zhitomirsky, Andras G. Pattantyus-Abraham, Larissa Levina, Lioz Etgar, Michael Grätzel and Edward H. Sargent

      Article first published online: 26 MAY 2011 | DOI: 10.1002/adma.201101065

      Thumbnail image of graphical abstract

      The first solution-processed depleted bulk heterojunction colloidal quantum dot solar cells are presented. The architecture allows for high absorption with full depletion, thereby breaking the photon absorption/carrier extraction compromise inherent in planar devices. A record power conversion of 5.5% under simulated AM 1.5 illumination conditions is reported.

    3. Directed Blood Vessel Growth Using an Angiogenic Microfiber/Microparticle Composite Patch (pages 3139–3143)

      Ross J. DeVolder, Harim Bae, Jonghwi Lee and Hyunjoon Kong

      Article first published online: 27 MAY 2011 | DOI: 10.1002/adma.201100823

      Thumbnail image of graphical abstract

      An angiogenic microfiber patch that releases angiogenic growth factors along aligned fibers and subsequently directs the spacing and orientation of mature and functional blood vessel formation is presented. The fiber patches are prepared by electrostatically binding electrosprayed vascular endothelial growth factor (VEGF)-encapsulating poly(lactide-co-glycolide) (PLGA) microparticles with electrospun poly(lactide) (PLA) microfibers.

    4. Solution-Processed Nanocrystal Quantum Dot Tandem Solar Cells (pages 3144–3148)

      Joshua J. Choi, Whitney N. Wenger, Rachel S. Hoffman, Yee-Fun Lim, Justin Luria, Jacek Jasieniak, John A. Marohn and Tobias Hanrath

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adma.201100723

      Thumbnail image of graphical abstract

      Solution-processed tandem solar cells created from nanocrystal quantum dots with size-tuned energy levels are demonstrated. Prototype devices featuring interconnected quantum dot layers of cascaded energy gaps exhibit IR sensitivity and an open circuit voltage, Voc, approaching 1 V. The tandem solar cell performance depends critically on the optical and electrical properties of the interlayer.

    5. Highly Efficient Activation of Molecular Oxygen with Nanoporous Metalloporphyrin Frameworks in Heterogeneous Systems (pages 3149–3154)

      Long Chen, Yong Yang, Zhaoqi Guo and Donglin Jiang

      Article first published online: 30 MAY 2011 | DOI: 10.1002/adma.201100974

      Thumbnail image of graphical abstract

      A nanoporous metalloporphyrin framework exhibits high activity in the activation of molecular oxygen and excellent catalytic activity in the aerobic epoxidation of olefins, with high conversion, outstanding selectivity, and broad substrate applicability. The porous framework is reusable and allows large-scale transformation. These catalytic features are correlated with the structural characteristics of the porous framework and mark a breakthrough for this classic reaction.

    6. Reversible Sodium Ion Insertion in Single Crystalline Manganese Oxide Nanowires with Long Cycle Life (pages 3155–3160)

      Yuliang Cao, Lifen Xiao, Wei Wang, Daiwon Choi, Zimin Nie, Jianguo Yu, Laxmikant V. Saraf, Zhenguo Yang and Jun Liu

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adma.201100904

      Thumbnail image of graphical abstract

      Single crystalline Na4Mn9O18 nanowires are prepared with a polymer-pyrolysis method. This material shows a high, reversible sodium ion insertion/extraction capacity, excellent cycling ability, and promising rate capability for sodium-ion battery applications.

    7. Facile Synthetic Route for Thickness and Composition Tunable Hollow Metal Oxide Spheres from Silica-Templated Coordination Polymers (pages 3161–3164)

      Ju-Un Park, Hee Jung Lee, Won Cho, Chiho Jo and Moonhyun Oh

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adma.201101161

      Thumbnail image of graphical abstract

      Monodisperse hollow metal oxides are generated from silica@coordination polymer core/shell precursors through a calcination process to transform coordination polymers into metal oxides, followed by an etching process to remove silica cores. The layer thicknesses of the hollow structures are effectively controlled by adjusting the shell thicknesses of the coordination polymers within the silica@coordination polymer core/shell precursors.

    8. Direct Fabrication of Functional and Biofunctional Nanostructures Through Reactive Imprinting (pages 3165–3169)

      Chandramouleeswaran Subramani, Nergiz Cengiz, Krishnendu Saha, Tugce Nihal Gevrek, Xi Yu, Youngdo Jeong, Avinash Bajaj, Amitav Sanyal and Vincent M. Rotello

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adma.201101292

      Thumbnail image of graphical abstract

      One-step reactive imprinting of a protected maleimide polymer provides a nanopatterned maleimide surface via a retro-Diels–Alder reaction. The patterned surfaces are used as scaffolds for the generation of functional and biofunctional structures. The biofunctional surface offers a platform for aligning the cells in the direction of patterns, demonstrating the potential for applications in the field of tissue engineering.

    9. Nanoscale Structure and Mechanism for Enhanced Electromechanical Response of Highly Strained BiFeO3 Thin Films (pages 3170–3175)

      Anoop R. Damodaran, Chen-Wei Liang, Qing He, Chun-Yen Peng, Li Chang, Ying-Hao Chu and Lane W. Martin

      Article first published online: 24 MAY 2011 | DOI: 10.1002/adma.201101164

      Thumbnail image of graphical abstract

      The presence of a variety of structural variants in BiFeO3 thin films give rise to exotic electric-field-induced responses and resulting electromechanical responses as large as 5%. Using high-resolution X-ray diffraction and scanning-probe-micro­scopy-based studies the numerous phases present at the phase boundaries are identified and an intermediate monoclinic phase, in addition to the previously observed rhombohedral- and tetragonal-like phases, is discovered.

    10. Nanoscale Electronics: Digital Fabrication by Direct Femtosecond Laser Processing of Metal Nanoparticles (pages 3176–3181)

      Yong Son, Junyeob Yeo, Hanul Moon, Tae Woo Lim, Sukjoon Hong, Koo Hyun Nam, Seunghyup Yoo, Costas P. Grigoropoulos, Dong-Yol Yang and Seung Hwan Ko

      Article first published online: 25 MAY 2011 | DOI: 10.1002/adma.201100717

      Thumbnail image of graphical abstract

      A digital, direct nanoscale metal patterning method is developed using femtosecond laser digital processing of metal nanoparticles for nanoscale electronics fabrication without using conventional vacuum deposition or a photolithography mask. This method is expected to be a potential alternative to the conventional electron beam lithography method for arbitrary nanoscale direct patterning in single-step, low-temperature, and non-vacuum environments.

    11. Protection and Promotion of UV Radiation-Induced Liposome Leakage via DNA-Directed Assembly with Gold Nanoparticles (pages 3182–3186)

      Neeshma Dave and Juewen Liu

      Article first published online: 31 MAY 2011 | DOI: 10.1002/adma.201101086

      Thumbnail image of graphical abstract

      DNA-functionalized gold nanoparticles and liposomes are assembled by a linker DNA. The gold nanoparticles can either protect the liposome from UV radiation induced leakage or can promote the leakage, depending on the DNA sequence and the alignment of the particles.

    12. Pattern Transfer and Electric-Field-Induced Magnetic Domain Formation in Multiferroic Heterostructures (pages 3187–3191)

      Tuomas H. E. Lahtinen, Jussi O. Tuomi and Sebastiaan van Dijken

      Article first published online: 25 MAY 2011 | DOI: 10.1002/adma.201100426

      Thumbnail image of graphical abstract

      The ability to tailor magnetic properties via coupling to ferroelectric domains is of great interest for the design of electric-field-tunable magnetic devices. Ferroelectric stripe domains are demonstrated to be fully transferable to magnetic thin films in multiferroic heterostructures and new magnetic domain patterns can be written by the application of an electric field.

      Corrected by:

      Correction: Correction: Pattern Transfer and Electric-Field-Induced Magnetic Domain Formation in Multiferroic Heterostructures

      Vol. 23, Issue 45, 5340, Article first published online: 29 NOV 2011

    13. Remote Controlled Multishape Polymer Nanocomposites with Selective Radiofrequency Actuations (pages 3192–3196)

      Zhengwang He, Nitin Satarkar, Tao Xie, Yang-Tse Cheng and J. Zach Hilt

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adma.201100646

      Thumbnail image of graphical abstract

      A multicomposite shape memory polymer (SMP) with remote and selective triggering of the recovery of multiple temporary shapes in radiofrequency fields is demonstrated. Each deformed region can be independently actuated at a specific frequency based on the filler type in the region. In addition, the nanocomposite SMP exhibits multiple temporary shapes and multiple possible shape recovery routes.

    14. Metamaterials on Paper as a Sensing Platform (pages 3197–3201)

      Hu Tao, Logan R. Chieffo, Mark A. Brenckle, Sean M. Siebert, Mengkun Liu, Andrew C. Strikwerda, Kebin Fan, David L. Kaplan, Xin Zhang, Richard D. Averitt and Fiorenzo G. Omenetto

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adma.201100163

      Thumbnail image of graphical abstract

      A paper-based metamaterial (MM) device, which can potentially be utilized for quantitative analysis in biochemical sensing applications is introduced. Proof-of-concept demonstrations are accomplished by patterning micrometer-sized MM reson­ators on paper substrates and monitoring the resonance shift induced by placing different concentrations of glucose solution on the paper MM.

    15. Transparent Conductive Graphene Films Synthesized by Ambient Pressure Chemical Vapor Deposition Used as the Front Electrode of CdTe Solar Cells (pages 3202–3206)

      Hui Bi, Fuqiang Huang, Jun Liang, Xiaoming Xie and Mianheng Jiang

      Article first published online: 30 MAY 2011 | DOI: 10.1002/adma.201100645

      Thumbnail image of graphical abstract

      Transparentgraphene conducting films are successfully incorporated in thin-film CdTe solar cells as the front electrode. A four-layer graphene film, deposited by an ambient pressure chemical vapor deposition (CVD) method, possesses a carrier mobility of 550 cm2 V−1 s−1 and an optical transparency of 90.5% from 350–2200 nm, achieving an overall efficiency of 4.17% in the prototype device.

    16. Superhydrophobic–Superoleophilic Polythiophene Films with Tunable Wetting and Electrochromism (pages 3207–3213)

      Roderick B. Pernites, Ramakrishna R. Ponnapati and Rigoberto C. Advincula

      Article first published online: 3 JUN 2011 | DOI: 10.1002/adma.201100469

      Thumbnail image of graphical abstract

      A non-fluorinated polythiophene film with dual superhydrophobic and super­o­leophilic wetting properties invol­ving 2D assembly of polystyrene (PS) latex particles and electropolymerization is demonstrated. The phenomenon is stable at a wide range of temperatures and pH. It is easily and rapidly reversed with voltage or surfactant coincident with elec­tro­­chromism.

  5. Research News

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Review
    5. Communications
    6. Research News
    1. Colloidal Synthesis of Ultrathin Two-Dimensional Semiconductor Nanocrystals (pages 3214–3219)

      Jae Sung Son, Jung Ho Yu, Soon Gu Kwon, Jihwa Lee, Jin Joo and Taeghwan Hyeon

      Article first published online: 27 MAY 2011 | DOI: 10.1002/adma.201101334

      Thumbnail image of graphical abstract

      2D semiconductor quantum wells are an important candidate for use in quantum devices. Recent advances in colloidal synthesis of uniform and ultrathin 2D CdSe nanocrystals are highlighted. Characterization of the structural and optical properties of these nanocrystals is discussed.

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