Advanced Materials

Cover image for Vol. 23 Issue 37

October 4, 2011

Volume 23, Issue 37

Pages 4207–4331

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
    1. Two-Dimensional Nanocrystals: Two-Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2 (Adv. Mater. 37/2011) (page 4207)

      Michael Naguib, Murat Kurtoglu, Volker Presser, Jun Lu, Junjie Niu, Min Heon, Lars Hultman, Yury Gogotsi and Michel W. Barsoum

      Article first published online: 28 SEP 2011 | DOI: 10.1002/adma.201190147

      Thumbnail image of graphical abstract

      The cover shows a scanning electron microscopy (SEM) image of graphene-like crystals of Ti3C2 called MXene. On page 4248 Yury Gogotsi, Michel W. Barsoum, and co-workers describe the exfoliation of Ti3AlC2, a member of a 60+ group of layered ternary carbides and nitrides known as MAX phases, by etching the aluminum out in HF. This approach can be used to synthesize other 2D carbides and nitrides. Colored SEM image by Babak Anasori, Drexel University.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
    1. Carbon Nanotubes: Integrated Carbon Nanotube Array as Dry Adhesive for High-Temperature Silicon Processing (Adv. Mater. 37/2011) (page 4208)

      Youngkee Eun, Jae-Ik Lee, Jungwook Choi, Youngsup Song and Jongbaeg Kim

      Article first published online: 28 SEP 2011 | DOI: 10.1002/adma.201190148

      Thumbnail image of graphical abstract

      Carbon nanotube (CNT) arrays are used as removable dry adhesives for high-temperature processes. As reported by Jongbaeg Kim and co-workers on page 4285, the adhesion force between the self-assembled CNTs is used to strain the microstructures in high-temperature environments. Arrays of analog micromirrors are successfully fabricated by CNT adhesives and the proposed method could be expanded to diverse 3D microstructure fabrication.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
  4. Review

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
    1. Colorimetric Biosensing Using Smart Materials (pages 4215–4236)

      Yujun Song, Weili Wei and Xiaogang Qu

      Article first published online: 29 JUL 2011 | DOI: 10.1002/adma.201101853

      Thumbnail image of graphical abstract

      For transformation of the detection events into color changes, a number of smart materials have been developed, including gold nanoparticles, magnetic nanoparticles, cerium oxide nanoparticles, carbon nanotubes, graphene oxide, and conjugated polymers. Recent developments in colorimetric biosensing using these smart materials and their applications in biomedical diagnosis and environmental monitoring are discussed.

  5. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
    1. Effective Mobility Enhancement by Using Nanometer Dot Doping in Amorphous IGZO Thin-Film Transistors (pages 4237–4242)

      Hsiao-Wen Zan, Wu-Wei Tsai, Chia-Hsin Chen and Chuang-Chuang Tsai

      Article first published online: 11 AUG 2011 | DOI: 10.1002/adma.201102530

      Thumbnail image of graphical abstract

      Applying nanometer dot-like doping to the channel region causes the intrinsic and effective mobilities of amorphous indium gallium zinc oxide (a-IGZO) thin-film transistor to increase. The nanodot doping reduces the effective channel length and lowers the energy barrier to facilitate electron transport in the a-IGZO film.

    2. Photoresponsive Transparent Conductive Metal with a Photobleaching Nose (pages 4243–4247)

      Mohammad Jamali, Mehdi Keshavarz Hedayati, Babak Mozooni, Mojtaba Javaherirahim, Ramzy Abdelaziz, Ahnaf Usman Zillohu and Mady Elbahri

      Article first published online: 15 AUG 2011 | DOI: 10.1002/adma.201102353

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      A photoswitchable, transparent, and highly conducting device that functions via nanophotonic interaction of a metal film coated with spirophenanthrooxazine (SPO) molecules embedded in a polymeric matrix and fabricated through spin coating is demonstrated. The device possesses additional novel functionality as a photobleaching gas sensor.

    3. Two-Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2 (pages 4248–4253)

      Michael Naguib, Murat Kurtoglu, Volker Presser, Jun Lu, Junjie Niu, Min Heon, Lars Hultman, Yury Gogotsi and Michel W. Barsoum

      Article first published online: 22 AUG 2011 | DOI: 10.1002/adma.201102306

      Thumbnail image of graphical abstract

      2D Ti3C2 nanosheets, multilayer structures, and conical scrolls produced by room temperature exfoliation of Ti3AlC2 in HF are reported. Since Ti3AlC2 is a member of a 60+ group of layered ternary carbides and nitrides, this discovery opens a door to the synthesis of a large number of other 2D crystals.

    4. Three-Dimensional Magnetic Assembly of Microscale Hydrogels (pages 4254–4260)

      Feng Xu, Chung-an Max Wu, Venkatakrishnan Rengarajan, Thomas Dylan Finley, Hasan Onur Keles, Yuree Sung, Baoqiang Li, Umut Atakan Gurkan and Utkan Demirci

      Article first published online: 10 AUG 2011 | DOI: 10.1002/adma.201101962

      Thumbnail image of graphical abstract

      A new biomaterial (M-gel) is developed by incorporating magnetic nanoparticles into microscopic hydrogels. The material maintains the biocompatibility of the hydrogels, while contributing additional capabilities for culture and magnetic manipulation. These M-gels can be used as building blocks to create 3D complex multilayer constructs using external magnetic fields.

    5. Efficient Separation of Dyes by Mucin: Toward Bioinspired White-Luminescent Devices (pages 4261–4264)

      Netta Hendler, Bogdan Belgorodsky, Elad D. Mentovich, Michael Gozin and Shachar Richter

      Article first published online: 8 AUG 2011 | DOI: 10.1002/adma.201100529

      Thumbnail image of graphical abstract

      Nature's ability to form stable and controllable host-guest systems is exploited to construct a new type of robust matrix biomaterial, which is used for the formation of protein luminescent films and devices. This simple methodology involves the extraordinary capabilities of mucin proteins to host hydrophobic dyes. It is shown that large variety of luminescent films can be formed.<?br?>

    6. Electrically Tunable Polymer DFB Laser (pages 4265–4269)

      Sebastian Döring, Matthias Kollosche, Torsten Rabe, Joachim Stumpe and Guggi Kofod

      Article first published online: 12 AUG 2011 | DOI: 10.1002/adma.201102465

      Thumbnail image of graphical abstract

      Soft optical components based on flexible polymers or fluids can be coupled to electroactive polymer artificial muscles for monolithically integrated optical elements with voltage controlled properties. A flexible polymer distributed feedback (DFB) dye laser is combined with an electroactive dielectric elastomer actuator to afford continuous voltage-controlled wavelength shift.

    7. A Novel Superhydrophilic and Underwater Superoleophobic Hydrogel-Coated Mesh for Oil/Water Separation (pages 4270–4273)

      Zhongxin Xue, Shutao Wang, Ling Lin, Li Chen, Mingjie Liu, Lin Feng and Lei Jiang

      Article first published online: 17 AUG 2011 | DOI: 10.1002/adma.201102616

      Thumbnail image of graphical abstract

      A novel superhydrophilic and underwater superoleophobic polyacrylamide (PAM) hydrogel-coated mesh is successfully fabricated in an oil/water/solid three-phase system. Compared to traditional oleophilic materials, the as-prepared hydrogel-coated meshes can selectively separate water from oil/water mixtures with the advantages of high efficiency, resistance to oil fouling, and easy recyclability.

    8. Clicking Well-Defined Biodegradable Nanoparticles and Nanocapsules by UV-Induced Thiol-Ene Cross-Linking in Transparent Miniemulsions (pages 4274–4277)

      Jiong Zou, Chyi Chin Hew, Efrosyni Themistou, Yukun Li, Chih-Kuang Chen, Paschalis Alexandridis and Chong Cheng

      Article first published online: 16 AUG 2011 | DOI: 10.1002/adma.201101646

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      A novel approach for the preparation of nanomaterials is developed by tuning miniemulsion reaction systems to be transparent in order to enable highly efficient photoreactions. Biodegradable nanoparticles and nanocapsules are obtained by UV-induced thiol-ene cross-linking of polylactide (PLA)-based precursor polymers preassembled in transparent miniemulsions. These well-defined nanomaterials may potentially serve as ideal scaffolds for drug delivery.

  6. Frontispiece

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
    1. Tissue Engineering: Mineral Coatings for Temporally Controlled Delivery of Multiple Proteins (Adv. Mater. 37/2011) (page 4278)

      Jae Sung Lee, Darilis Suarez-Gonzalez and William L. Murphy

      Article first published online: 28 SEP 2011 | DOI: 10.1002/adma.201190150

      Thumbnail image of graphical abstract

      Bioresorbable mineral coatings on a common orthopedic biomaterial, β-tricalcium phosphate (β-TCP), are used as a temporally controllable protein delivery system. As reported by William L. Murphy and coworkers, mineral coatings can effi ciently bind the proteins, and one or more proteins are released with distinct kinetics by varying the mineral coating properties and incorporating proteins during coating formation.

  7. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Review
    6. Communications
    7. Frontispiece
    8. Communications
    1. Mineral Coatings for Temporally Controlled Delivery of Multiple Proteins (pages 4279–4284)

      Jae Sung Lee, Darilis Suarez-Gonzalez and William L. Murphy

      Article first published online: 17 AUG 2011 | DOI: 10.1002/adma.201100060

      Thumbnail image of graphical abstract

      Mineral coatings are presented as a temporally controllable protein release system on a common orthopedic device material, β-tricalcium phosphate (β-TCP). Proteins are bound to coatings via electrostatic interactions and release of one or more proteins is temporally controlled in a predictable manner by modulating the physicochemical properties of mineral coatings, including morphology and dissolution rate.

    2. Integrated Carbon Nanotube Array as Dry Adhesive for High-Temperature Silicon Processing (pages 4285–4289)

      Youngkee Eun, Jae-Ik Lee, Jungwook Choi, Youngsup Song and Jongbaeg Kim

      Article first published online: 16 AUG 2011 | DOI: 10.1002/adma.201102331

      Thumbnail image of graphical abstract

      CNT arrays are used as removable dry adhesives for high-temperature processes with temperatures that increase by as much as 900 °C. The adhesion force between the self-assembled CNTs is utilized to strain the microstructures in high-temperature environments. Arrays of analog micromirrors are successfully fabricated by silicon processing. The proposed method significantly simplifies the fabrication process.

    3. Energy Gap Reduction in DNA by Complexation with Metal Ions (pages 4290–4294)

      Errez Shapir, Giorgia Brancolini, Tatiana Molotsky, Alexander B. Kotlyar, Rosa Di Felice and Danny Porath

      Article first published online: 12 AUG 2011 | DOI: 10.1002/adma.201101100

      Thumbnail image of graphical abstract

      Samples of metalized DNA (M-DNA) are produced. The electrical characteristics are measured and the electronic structure is simulated. Electrical currents are mediated by hybrid electronic states that arise from the interaction between the metal ions and the bases. The emerging picture is that of axial charge transfer mediated by the metal ions.

    4. Low-Power and Ultrafast All-Optical Tunable Nanometer-Scale Photonic Metamaterials (pages 4295–4300)

      Xiaoyong Hu, Yingbo Zhang, Yulan Fu, Hong Yang and Qihuang Gong

      Article first published online: 15 AUG 2011 | DOI: 10.1002/adma.201101350

      Thumbnail image of graphical abstract

      A nanometer-scale all-optical tunable photonic metamaterial is realized by combining non-linearity enhancement associated with photonic band resonance and quantum confinement. A positive-to-negative switching of the effective dielectric constant is achieved. The operating pump power is reduced by three orders of magnitude, while an ultrafast response time on the order of picoseconds and large tunability are maintained.

    5. Surface-Initiated Phase Separation–Fabrication of Two-Layer Organic Light-Emitting Devices in a Single Processing Step (pages 4301–4305)

      Anne Köhnen, Nina Riegel, David C. Müller and Klaus Meerholz

      Article first published online: 16 AUG 2011 | DOI: 10.1002/adma.201102368

      Thumbnail image of graphical abstract

      The use of surface-initiated phase separation (SIPS) for simple and cost-effectivefabrication of solution-processed multilayer organic light-emitting diodes (OLEDs) is presented. In a mixture of a cross-linkable and a non-cross-linkable compounds the first one will be cross-linked surface-induced. This causes a phase-separation of the two materials. A two-layer device is generated out of a single deposition step.

    6. Minority Carrier Lifetimes and Surface Effects in VLS-Grown Axial p–n Junction Silicon Nanowires (pages 4306–4311)

      Yeonwoong Jung, Aleksandar Vacic, Daniel E. Perea, Samuel T. Picraux and Mark A. Reed

      Article first published online: 17 AUG 2011 | DOI: 10.1002/adma.201101429

      Thumbnail image of graphical abstract

      The minority carrier lifetimes of VLS-grown axial p–n junction silicon nanowires are characterized by the reverse recovery transients of electrically injected minority carriers. Nanowire-diameter-dependent lifetimes and various electrical properties indicate the enhanced surface recombination with decreasing diameters, suggesting the significance of surface passivations for effective carrier transport in photovoltaic applications.

    7. Bending Materials with Light: Photoreversible Macroscopic Deformations in a Disordered Polymer (pages 4312–4317)

      Yuhuan Jin, Shadrick I. M. Paris and Jeffrey J. Rack

      Article first published online: 17 AUG 2011 | DOI: 10.1002/adma.201102157

      Thumbnail image of graphical abstract

      An amorphous co-polymer formed from norbornene and a photochromic ruthenium sulfoxide complex shows reversible macroscopic deformations when irradiated. Charge-transfer excitation of the sulfur-bonded isomer leads to isomerization and a macroscopic bending of the film. Charge-transfer excitation of the oxygen-bonded isomer reverses the bending. The macroscopic bending is ascribed to the molecular isomerization.

    8. Interfacial Mechanics of Carbon Nanotube@Amorphous-Si Coaxial Nanostructures (pages 4318–4322)

      Hongwei Liao, Khim Karki, Yin Zhang, John Cumings and YuHuang Wang

      Article first published online: 17 AUG 2011 | DOI: 10.1002/adma.201101762

      Thumbnail image of graphical abstract

      A cantilevered carbon nanotube/amorphous Si coaxial nanostructure is studied with in situ transmission electron microscopy. The α-Si shell breaks at the anchoring point to the supporting Si substrate. The broken α-Si shell is pulled out while the CNT core remains intact, illustrating the striking interfacial mechanical properties between the CNT core and the α-Si shell.

    9. Magneto-Optical Properties of Electrodeposited Thin Films of the Molecule-Based Magnet Cr5.5(CN)12·11.5H2O (pages 4323–4326)

      Eugenio Coronado, Magdalena Makarewicz, Juan P. Prieto-Ruiz, Helena Prima-García and Francisco M. Romero

      Article first published online: 10 AUG 2011 | DOI: 10.1002/adma.201101513

      Thumbnail image of graphical abstract

      Electrodeposited thin films of the molecule-based magnet Cr5.5(CN)12·11.5H2O exhibit a magneto-optical Kerr effect (MOKE) with large coercive fields at 200 K. As the thickness of the films is reduced to the nanometer scale, the particle size decreases and the magneto-optical hysteresis becomes relatively large.

    10. Self-Assembled Transparent Conductive Electrodes from Au Nanoparticles in Surfactant Monolayer Templates (pages 4327–4331)

      Ahiud Morag, Liron Philosof-Mazor, Roman Volinsky, Elad Mentovich, Shachar Richter and Raz Jelinek

      Article first published online: 16 AUG 2011 | DOI: 10.1002/adma.201101290

      Thumbnail image of graphical abstract

      Transparent conductive electrodes (TCEs) are produced using a bottom-up approach. Hydrophobically coated gold nanoparticles (Au NPs) are assembled within surfactant monolayer templates formed at the air/water interface. The Au NP network is then transferred onto solid substrates and becomes scaffolding for further gold enhancement. The resultant thin films exhibit excellent transparency and electrical conductivity from nanometer to centimeter scales.

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