Advanced Materials

Cover image for Vol. 21 Issue 37

October 5, 2009

Volume 21, Issue 37

Pages 3719–3812

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
    1. Neural Electrodes: Interfacing Conducting Polymer Nanotubes with the Central Nervous System: Chronic Neural Recording using Poly(3,4-ethylenedioxythiophene) Nanotubes (Adv. Mater. 37/2009)

      Mohammad Reza Abidian, Kip A. Ludwig, Timothy C. Marzullo, David C. Martin and Daryl R. Kipke

      Article first published online: 28 SEP 2009 | DOI: 10.1002/adma.200990142

      Thumbnail image of graphical abstract

      Microelectrodes implanted in the brain are increasingly being used to treat neurological disorders. However, robust and reliable chronic application of neural electrodes remains a challenge. Mohammed Reza Abidian and co-workers report on p. 3764 the use of conducting polymer nanotubes as highly selective neural interfaces for chronic neural recordings at the microscale. The quality of neuronal spike recordings was significantly improved relative to comparably sized metal electrode sites, primarily through a reduced noise level amidst maintained spike amplitudes.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
    1. Photonic Crystals: Patterned Polymeric Domes with 3D and 2D Embedded Colloidal Crystals using Photocurable Emulsion Droplets (Adv. Mater. 37/2009)

      Shin-Hyun Kim, Se-Heon Kim and Seung-Man Yang

      Article first published online: 28 SEP 2009 | DOI: 10.1002/adma.200990143

      Thumbnail image of graphical abstract

      The inside cover shows a scheme for the preparation of photonic dome patterns, SEM images of a dome pattern, and a single dome decorated with 2D colloid array, as fabricated in work reported on p 3771 by Seung-Man Yang and co-workers. The background is an optical microscopy image of patterned photonic domes, which can be used as a near-field microlens array. The greenish color of the domes corresponds to the photonic bandgap.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
  4. Correspondence

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
    1. Comment on “The Magnetocaloric Effect of LaFe11.6Si1.4, La0.8Nd0.2Fe11.5Si1.5, and Ni43Mn46Sn11 Compounds in the Vicinity of the First-Order Phase Transition” (pages 3725–3726)

      Lluís Mañosa, Antoni Planes and Xavier Moya

      Article first published online: 6 JUL 2009 | DOI: 10.1002/adma.200900688

      Thumbnail image of graphical abstract

      The aim of the present comment is to show that when both calorimetric and magnetization measurements are properly executed, there is no significant discrepancy in the entropy values obtained from the two methods, thus validating the use of the Maxwell relations, which is the most commonly used technique in the study of the magnetocaloric effect.

  5. Comment

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
    1. Reply to “Comment on the Magnetocaloric Effect of LaFe11.6Si1.4, La0.8Nd0.2Fe11.5Si1.5, and Ni43Mn46Sn11 Compounds in the Vicinity of the First-Order Phase Transition” (pages 3727–3729)

      Jun-Ding Zou, Bao-Gen Shen, Bo Gao, Jun Shen and Ji-Rong Sun

      Article first published online: 27 JUL 2009 | DOI: 10.1002/adma.200901435

      Thumbnail image of graphical abstract

      The magnetocaloric effect (MCE) of Ni43Mn46Sn11 in the vicinity of a first-order martensitic phase transition is discussed by using magnetic measurements, heat capacity measurements and differential scanning calorimetry (DSC) measurements. The results confirm that the MCE of Ni43Mn46Sn11 obtained by magnetic measurements (via the Maxwell relation) may be seriously overestimated and Ni-Mn-Sn alloys should be treated carefully.

  6. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
    1. Toward the Development of Printable Nanowire Electronics and Sensors (pages 3730–3743)

      Zhiyong Fan, Johnny C. Ho, Toshitake Takahashi, Roie Yerushalmi, Kuniharu Takei, Alexandra C. Ford, Yu-Lun Chueh and Ali Javey

      Article first published online: 24 JUN 2009 | DOI: 10.1002/adma.200900860

      Thumbnail image of graphical abstract

      The recent advancements in the large-scale integration of single crystalline, inorganic nanowire (NW) arrays for electronic and sensor applications are discussed, specifically involving the contact printing of NWs at defined locations. We address the advantages, limitations, and the state-of-the-art of this technology, and present an integration platform for future printable, heterogeneous sensor circuitry based on NW parallel arrays.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
    1. Patterned Wettability Transition by Photoelectric Cooperative and Anisotropic Wetting for Liquid Reprography (pages 3744–3749)

      Dongliang Tian, Qinwen Chen, Fu-Qiang Nie, Jinjie Xu, Yanlin Song and Lei Jiang

      Article first published online: 26 MAY 2009 | DOI: 10.1002/adma.200900022

      Thumbnail image of graphical abstract

      An approach to address the precise controllable patterned wettability transition on the superhydrophobic aligned photoconductive nanorod-array surface via a photoelectric cooperative wetting process is described. This work is promising to gear up the application of locally confining liquids at a desired location, such as liquid reprography by patterned-light illumination.

    2. Biomimetically Controlled Formation of Nanotextured Silica/Titania Films on Arbitrary Substrates and Their Tunable Surface Function (pages 3750–3753)

      Ren-Hua Jin and Jian-Jun Yuan

      Article first published online: 26 MAY 2009 | DOI: 10.1002/adma.200803393

      Thumbnail image of graphical abstract

      Substrates with arbitrary shapes covered by a linear polyethyleneimine layer can effectively afford complexly nanotextured silica/titania thin films on their surfaces when the substrates are dipped into the source solutions at room temperature. The nanotextured thin films can be turned into superhydrophobic surfaces after they are treated with alkylsilane.

    3. A Family of Electronically Reconfigurable Nanodevices (pages 3754–3758)

      J. Joshua Yang, Julien Borghetti, David Murphy, Duncan R. Stewart and R. Stanley Williams

      Article first published online: 2 JUN 2009 | DOI: 10.1002/adma.200900822

      Thumbnail image of graphical abstract

      AFM image of 17 nanodevices with a zoom-in cartoon schematically shows an individual crosspoint device consisting of two Pt metal electrodes separated by a TiO2 bi-layer memristive material. By applying an electric field across the memristive material, oxygen vacancies can drift up and down, leading to four current-transport end-states. The switching between these end-states results in a family of nanodevices.

    4. Polaron Localization at Interfaces in High-Mobility Microcrystalline Conjugated Polymers (pages 3759–3763)

      N. Zhao, Y.-Y. Noh, J.-F. Chang, M. Heeney, I. McCulloch and H. Sirringhaus

      Article first published online: 2 JUN 2009 | DOI: 10.1002/adma.200900326

      Thumbnail image of graphical abstract

      The charge-induced optical absorptions of two-dimensional polarons in semicrystalline, high-mobility conjugated polymers are investigated as a function of distance from an interface with polymer gate dielectrics of different dielectric constants. For high-k dielectrics, polarons in the accumulation layer at the interface are found to be more localized than those in the bulk.

    5. Interfacing Conducting Polymer Nanotubes with the Central Nervous System: Chronic Neural Recording using Poly(3,4-ethylenedioxythiophene) Nanotubes (pages 3764–3770)

      Mohammad Reza Abidian, Kip A. Ludwig, Timothy C. Marzullo, David C. Martin and Daryl R. Kipke

      Article first published online: 29 JUL 2009 | DOI: 10.1002/adma.200900887

      Thumbnail image of graphical abstract

      Microelectrodes implanted in the brain are increasingly being used to treat neurological disorders. However, robust and reliable chronic application of neural electrodes remains a challenge. Here, we report, the use of conducting polymer nanotubes as highly selective neural interfaces for chronic neural recordings. Poly(3,4-ethylenedioxythiophene) nanotubes were formed on the chronic neural microelectrode. The quality of neuronal spike recordings was significantly improved relative to metal electrode sites.

    6. Patterned Polymeric Domes with 3D and 2D Embedded Colloidal Crystals using Photocurable Emulsion Droplets (pages 3771–3775)

      Shin-Hyun Kim, Se-Heon Kim and Seung-Man Yang

      Article first published online: 3 AUG 2009 | DOI: 10.1002/adma.200901243

      Thumbnail image of graphical abstract

      Hierarchical dome patterns are prepared via a novel single-step patterning process. Photonic domes with isotropic reflection colors are patterned on a prepatterned glass substrate with a hydrophobic moiety using photocurable emulsion droplets of all-equal size, which contain concentrated silica particles. Furthermore, embossed domes are patterned with PS particle-stabilized photocurable emulsion droplets, which can act as a near-field microlens array.

    7. Bis(carbazolyl)benzodifuran: A High-Mobility Ambipolar Material for Homojunction Organic Light-Emitting Diode Devices (pages 3776–3779)

      Hayato Tsuji, Chikahiko Mitsui, Yoshiharu Sato and Eiichi Nakamura

      Article first published online: 21 MAY 2009 | DOI: 10.1002/adma.200900634

      Thumbnail image of graphical abstract

      A new ambipolar material bis(carbazolyl)benzodifuran (CZBDF) shows well-balanced and high carrier mobilities for both holes and electrons (>10−3 cm2 V−1 s−1). This new material allows us to fabricate efficient p-i-n homojunction OLEDs that emit light across the full visible color range and perform at a level similar to state-of-the-art heterojunction devices.

    8. Metamagnetism Seeded by Nanostructural Features of Single-Crystalline Gd5Si2Ge2 (pages 3780–3783)

      James D. Moore, Kelly Morrison, Garry K. Perkins, Deborah L. Schlagel, Thomas A. Lograsso, Karl A. Gschneidner Jr., Vitalij K. Pecharsky and Lesley F. Cohen

      Article first published online: 14 MAY 2009 | DOI: 10.1002/adma.200900093

      Thumbnail image of graphical abstract

      Gd5Si2Ge2 belongs to the class of materials known as metamagnets that show promise for application in room-temperature magnetic refrigeration using a phenomenon known as the magnetocaloric effect. Here we image the metamagnetic transition using a local scanning Hall probe and reveal how the microstructure controls the critical properties.

    9. Piezoelectric and Electric-Field-Induced Properties of a Ferroelectric Bent-Core Liquid Crystal (pages 3784–3788)

      Antal Jákli, Inmaculada C. Pintre, José Luis Serrano, M. Blanca Ros and M. Rosario de la Fuente

      Article first published online: 26 MAY 2009 | DOI: 10.1002/adma.200900131

      Thumbnail image of graphical abstract

      A new adamantane bent-core liquid crystal exhibiting a metastable ferroelectric phase with large polarization is synthesized and characterized. The material shows reversible switching between a birefringent (opaque) and an optically isotropic (clear) state. In the clear state, the observed piezoelectric constant is comparable to those of commercial solid-state piezotransducers.

    10. Self-Assembled Nanoscale Ring Arrays from a Polystyrene-b-polyferrocenylsilane-b-poly(2-vinylpyridine)Triblock Terpolymer Thin Film (pages 3789–3793)

      Vivian P. Chuang, Caroline A. Ross, Jessica Gwyther and Ian Manners

      Article first published online: 8 JUL 2009 | DOI: 10.1002/adma.200900756

      Thumbnail image of graphical abstract

      Hollow ring arrays with an outer and inner diameter of 33 and 11 nm, respectively, are formed from a thin film of poly-(styrene-b-ferrocenylethylmethylsilane-b-2-vinyl pyridine) (PS-b-PFS-b-P2VP) triblock terpolymer with a core/shell cylindrical morphology. The PS minority block forms a core surrounded by a PFS shell in a P2VP matrix; the core/shell structure is oriented perpendicularly to the film surface. The PS core and P2VP matrix blocks are partly removed using oxygen reactive ion etching, leaving ring patterns made from oxidized PFS.

    11. Vertical Interface Effect on the Physical Properties of Self-Assembled Nanocomposite Epitaxial Films (pages 3794–3798)

      Hao Yang, Haiyan Wang, Jongsik Yoon, Yongqiang Wang, Menka Jain, David M. Feldmann, Paul C. Dowden, Judith L. MacManus-Driscoll and Quanxi Jia

      Article first published online: 26 MAY 2009 | DOI: 10.1002/adma.200900781

      Thumbnail image of graphical abstract

      Vertical interface effect on the physical properties of epitaxial metal-oxide films is demonstrated. Self-assembled (BiFeO3)0.5:(Sm2O3)0.5 nanocomposite films are fabricated with three-dimensional heteroepitaxy having an ordered nano-columnar structure on a large scale. The vertical interface effect on lattice parameters, dielectric properties, and leakage currents is investigated.

    12. Designing Superhydrophobic Porous Nanostructures with Tunable Water Adhesion (pages 3799–3803)

      Yuekun Lai, Xuefeng Gao, Huifang Zhuang, Jianying Huang, Changjian Lin and Lei Jiang

      Article first published online: 26 MAY 2009 | DOI: 10.1002/adma.200900686

      Thumbnail image of graphical abstract

      Basic principles of capillary-induced adhesion and roughness-enhanced hydrophobicity are utilized to design three superhydrophobic porous-nanostructure models whose adhesion forces ranged from strong to weak. The design idea is well-supported by experimental results, which indicated that adhesive forces may be tailored by modifying structural morphologies to manipulate solid–liquid contact behavior and air-pocket composition in open or sealed systems.

    13. Facile and Scalable Synthesis of Tailored Silica “Nanorattle” Structures (pages 3804–3807)

      Dong Chen, Linlin Li, Fangqiong Tang and Shuo Qi

      Article first published online: 28 MAY 2009 | DOI: 10.1002/adma.200900599

      Thumbnail image of graphical abstract

      Silica “nanorattles” are fabricated by means of selective etching of ingeniously designed organic–inorganic hybrid silica spheres with a three-layer “sandwich” structure. The size (95–645 nm), shell thickness, and core diameter of the monodisperse nanorattles can be precisely controlled, even in gram-scale production. This method is also shown to be promising for development as a general method for synthesis of rattle-type functional nanomaterials.

    14. Improved Thermoelectric Properties of Cu-Doped Quaternary Chalcogenides of Cu2CdSnSe4 (pages 3808–3812)

      Min-Ling Liu, I-Wei Chen, Fu-Qiang Huang and Li-Dong Chen

      Article first published online: 21 MAY 2009 | DOI: 10.1002/adma.200900409

      Thumbnail image of graphical abstract

      The chalcopyrite-like structure of Cu2MSnQ4 is an ordered tetrahedral array of flattened CuQ4 and undistorted MQ4 and SnQ4, with a low lattice thermal conductivity. The [Cu2Q4] tetrahedral layers are electrically conducting, and the [SnMQ4] layers are electrically insulating.

  8. Correction

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Correspondence
    6. Comment
    7. Review
    8. Communications
    9. Correction
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