Advanced Functional Materials

Cover image for Vol. 18 Issue 5

March 11, 2008

Volume 18, Issue 5

Pages 671–830

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Cover Picture: Controlling the Thickness of the Surface Oxide Layer on Cu Nanoparticles for the Fabrication of Conductive Structures by Ink-Jet Printing (Adv. Funct. Mater. 5/2008)

      Sunho Jeong, Kyoohee Woo, Dongjo Kim, Soonkwon Lim, Jang Sub Kim, Hyunjung Shin, Younan Xia and Jooho Moon

      Version of Record online: 13 MAR 2008 | DOI: 10.1002/adfm.200890021

      Thumbnail image of graphical abstract

      With the aim of preparing a high-performance conductive ink, the surface oxide layer on Cu nanoparticles synthesized in ambient atmosphere is minimized by adjusting the molecular weight of poly(N-vinylpyrrolidone) capping molecules. On p. 679, Joohoo Moon andco-workers demonstrate that by minimizing the thickness of the surface oxide layer, Cu granular films with good conductivity on a plastic substrate can be obtained by sintering nanoparticle assembles.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Inside Front Cover: Two-Dimensional Hexagonally-Ordered Mesoporous Carbon Nitrides with Tunable Pore Diameter, Surface Area and Nitrogen Content (Adv. Funct. Mater. 5/2008)

      Ajayan Vinu

      Version of Record online: 13 MAR 2008 | DOI: 10.1002/adfm.200890022

      Thumbnail image of graphical abstract

      Ajayan Vinu and co-workers report on p. 816 the successful preparation of two-dimensional mesoporous carbon nitride (MCN) with tunable pore diameters, from 4.2 to 6.4 nm, by using SBA-15 materials with different pore diameters as template through a simple polymerization reaction between ethylenediamine and carbon tetrachloride. The materials are highly active and show a high conversion and 100% product selectivity to caprophenone in the Friedel-Crafts acylation of benzene using hexanoyl chloride.

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
  4. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index
    1. Controlling the Thickness of the Surface Oxide Layer on Cu Nanoparticles for the Fabrication of Conductive Structures by Ink-Jet Printing (pages 679–686)

      Sunho Jeong, Kyoohee Woo, Dongjo Kim, Soonkwon Lim, Jang Sub Kim, Hyunjung Shin, Younan Xia and Jooho Moon

      Version of Record online: 26 FEB 2008 | DOI: 10.1002/adfm.200700902

      Thumbnail image of graphical abstract

      Cu nanoparticle-based conductive ink-jet printable inks: To prepare a high performance conductive ink, the surface oxide layer on Cu nanoparticles synthesized in ambient atmosphere was minimized by adjusting the molecular weight of poly(N-vinylpyrrolidone) capping molecules. By minimizing the thickness of the layer, Cu granular films on a plastic substrate with good conductivity could be obtained by sintering nanoparticle assembles.

    2. Organization of Organic Molecules with Inorganic Nanoparticles: Hybrid Nanodiodes (pages 687–693)

      Kallol Mohanta, Sudip K. Batabyal and Amlan J. Pal

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700926

      Thumbnail image of graphical abstract

      Hybrid nanodiodes are formed by electrostatic binding of a monolayer of ZnO nanoparticles and a monolayer of different organic materials (see figure). Current-voltage characteristics of nanoparticle/organic and organic/nanoparticle junctions are rectifying in nature - the direction of rectification in the former being opposite to that in the latter.

    3. Hydroxyapatite Modified with Carbon-Nanotube-Reinforced Poly(methyl methacrylate): A Nanocomposite Material for Biomedical Applications (pages 694–700)

      Manoj Kumar Singh, Tolou Shokuhfar, José Joaquim de Almeida Gracio, António Carlos Mendes de Sousa, José Maria Da Fonte Fereira, Hamid Garmestani and Said Ahzi

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700888

      Thumbnail image of graphical abstract

      A novel nanocomposite designed for a new generation of biomedical bone cement and implant coatings is reported: the composite material consists of poly(methyl methacrylate) (PMMA)-modified hydroxyapatite (HA) reinforced with multiwalled carbon nanotubes (see figure). The findings suggest that 0.1% of multi-walled carbon nanotubes in the PMMA/HA nanocomposite material gives the best mechanical properties

    4. Universal Colorimetric Detection of Nucleic Acids Based on Polydiacetylene (PDA) Liposomes (pages 701–708)

      Yun Kyung Jung, Tae Won Kim, Jumi Kim, Jong-Man Kim and Hyun Gyu Park

      Version of Record online: 7 MAR 2008 | DOI: 10.1002/adfm.200700929

      Thumbnail image of graphical abstract

      A universal PDA-based colorimetric sensor, based on ionic interactions between the positively charged PDA and the negatively charged phosphate backbone of double-stranded DNA (dsDNA), was developed to verify the PCR-amplified nucleic acids. By using the primary amine-functionalized PDA sensor, the nucleic acids amplified by a common PCR reaction can be readily detected and the resulted color transition from blue to red is enough to be detected by the naked eye.

    5. Strontium Barium Niobate as a Multifunctional Two-Dimensional Nonlinear “Photonic Glass” (pages 709–715)

      Pablo Molina, María de la O Ramírez and Luisa E. Bausá

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700905

      Thumbnail image of graphical abstract

      Multi-directional and broadband, angularly dispersed second and third harmonic generation for planar and conical processes are demonstrated from a SBN laser crystal. The non periodic nature of the ferroelectric domain distribution makes SBN a feasible example of a two-dimensional generalized nonlinear photonic glass, which can be very promising for novel optical multifunctional devices.

    6. Block Copolymer ‘Stealth’ Nanoparticles for Chemotherapy: Interactions with Blood Cells In Vitro (pages 716–725)

      Lwin L. Ma, Pan Jie and Subbu S. Venkatraman

      Version of Record online: 7 MAR 2008 | DOI: 10.1002/adfm.200700634

      Thumbnail image of graphical abstract

      The modification of the surface of poly(L-lactide) (PLA) nanoparticles by copolymerization with PLA-poly(ethylene glycol) (PEG) and self-assembly of copolymers has a significant effect on their uptake by monocyte cells. The effects of the nanoparticle surface composition and surface structure as well as particle size range on uptake by cells in whole blood are studied. The use of fluorescent tags and flow cytometry allows the formation of a ‘phagocytic index’.

    7. Tetraphenylimidazole-Based Excited-State Intramolecular Proton-Transfer Molecules for Highly Efficient Blue Electroluminescence (pages 726–731)

      Sanghyuk Park, Jangwon Seo, Se Hun Kim and Soo Young Park

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700827

      Thumbnail image of graphical abstract

      Novel hydroxyl-substituted tetraphenylimidazole derivatives promise efficient bright-blue electroluminescence as shown in the figure. Devices based on these structures attained current densities of 1.96 cd A−1 and quantum efficiencies of up to 2.94%. The devices also showed much improved morphological and thermal stability.

    8. Antimicrobial Gallium-Doped Phosphate-Based Glasses (pages 732–741)

      Sabeel P. Valappil, Derren Ready, Ensanya A. Abou Neel, David M. Pickup, Wojciech Chrzanowski, Luke A. O'Dell, Robert J. Newport, Mark E. Smith, Michael Wilson and Jonathan C. Knowles

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700931

      Thumbnail image of graphical abstract

      Novel quaternary gallium-doped phosphate-based glasses are unique for controlled delivery of Ga3+ which is found to inhibit bacterial growth. The lack of new antibiotics in development makes these glasses potential new therapeutic agents for pathogenic bacteria including MRSA and C. difficile.

    9. The Effect of Interfacial Roughness on the Thin Film Morphology and Charge Transport of High-Performance Polythiophenes (pages 742–750)

      Youngsuk Jung, R. Joseph Kline, Daniel A. Fischer, Eric K. Lin, Martin Heeney, Iain McCulloch and Dean M. DeLongchamp

      Version of Record online: 26 FEB 2008 | DOI: 10.1002/adfm.200701089

      Thumbnail image of graphical abstract

      Charge transport properties of polythiophene-basedfield effect transistors are found to be strongly influenced by dielectric roughness. A critical roughness is observed between (0.5 and 0.8) nm, above which the microstructure is disrupted and carrier mobility is impaired. Rough dielectrics alter the layered microstructure by reducing the lateral domain size and decreasing the extent of long-range layer order.

    10. Interaction Scheme and Temperature Behavior of Energy Transfer in a Light-Emitting Inorganic-Organic Composite System (pages 751–757)

      Antonio Alvaro Ranha Neves, Andrea Camposeo, Roberto Cingolani and Dario Pisignano

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700538

      Thumbnail image of graphical abstract

      A study of the energy transfer in the composite system given by ZnO particles interacting with the conjugated polymer, poly[2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene], by varying the acceptor concentration, and the system temperature in the range 50–300 K is presented. The temperature dependence of the energy transfer rate is described by a rate model and a dipole–surface interaction scheme in the hybrid material.

    11. Incorporation of a Hydrophobic Antibacterial Peptide into Amphiphilic Polyelectrolyte Multilayers: A Bioinspired Approach to Prepare Biocidal Thin Coatings (pages 758–765)

      Aurélie Guyomard, Emmanuelle Dé, Thierry Jouenne, Jean-Jacques Malandain, Guy Muller and Karine Glinel

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700793

      Thumbnail image of graphical abstract

      A non-water-soluble natural antibacterial peptide was successfully incorporated into polyelectrolyte assemblies based on amphiphilic polysaccharides. The biocidal properties of these biofunctionalized films was tested against a gram-positive bacterium, E. faecalis. The presence of lysed bacterial cells on the film surface testifies for their antibacterial activity (see photo).

    12. Gd2O(CO3)2 · H2O Particles and the Corresponding Gd2O3: Synthesis and Applications of Magnetic Resonance Contrast Agents and Template Particles for Hollow Spheres and Hybrid Composites (pages 766–776)

      I-Fang Li, Chia-Hao Su, Hwo-Shuenn Sheu, Hui-Chi Chiu, Yi-Wei Lo, Wei-Ting Lin, Jyh-Horng Chen and Chen-Sheng Yeh

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700702

      Thumbnail image of graphical abstract

      Colloidal particles of Gd2O(CO3)2 · H2O have been prepared by refluxing a mixture of GdCl3 · 6H2O and urea. Spherical Gd2O(CO3)2 · H2O particles exhibit multifunctional capability, demonstrating a magnetic resonance (MR) contrast effect for MR imaging (MRI) as well as serving as a template to fabricate hollow silica structures and composites with various nanoshell compositions (see figure)

    13. Magnetism and Phase Formation in the Candidate Dilute Magnetic Semiconductor System In2 − xCrxO3: Bulk Materials are Dilute Paramagnets (pages 777–784)

      L. Bizo, M. Allix, H. Niu and M. J. Rosseinsky

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700672

      Thumbnail image of graphical abstract

      Cr3+ cations substituted into In2O3 behave as dilute paramagnetic centers. The weak interactions between the cations are due not only to the dilution but also to the site preference of the dopants within the bixbyite host structure. The very small ferromagnetic magnetization observed in these bulk materials is accounted for by adventitious contamination.

    14. Unusual Strain Accommodation and Conductivity Enhancement by Structure Modulation Variations in Sr4Fe6O12+δ Epitaxial Films (pages 785–793)

      Cecilia Solís, Marta D. Rossell, Gemma Garcia, Gustaaf Van Tendeloo and José Santiso

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200701011

      Thumbnail image of graphical abstract

      The strain accommodation in epitaxial b-axis oriented Sr4Fe6O12+2α films depends on thickness and substrate material. This causes variations in the structure modulation along the in-plane a-axis in a wide range of α values (q = αa is the modulation vector) from 0.40 to 0.45, for fully strained or relaxed films, respectively. These variations are responsible for the significant enhancement in the total electrical conductivity for strained thin films with lower α value.

    15. Order of Magnitude Effects of Thiazole Regioisomerism on the Near-IR Two-Photon Cross-Sections of Dipolar Chromophores (pages 794–801)

      Karin Schmidt, Amalia Leclercq, Egbert Zojer, PaDreyia V. Lawson, Sei-Hum Jang, Stephen Barlow, Alex K.-Y. Jen, Seth R. Marder and Jean-Luc Brédas

      Version of Record online: 7 MAR 2008 | DOI: 10.1002/adfm.200701177

      Thumbnail image of graphical abstract

      Regioisomers related to thiazole (electron-poor) heterocycles incorporated into the backbone of dipolar molecules are demonstrated to exhibit two-photon absorption cross-sections that differ by more than an order of magnitude in the near infra-red wavelength range.

    16. Electrically Directed On-Chip Reversible Patterning of Two-Dimensional Tunable Colloidal Structures (pages 802–809)

      Rongguo Xie and Xiang-Yang Liu

      Version of Record online: 7 MAR 2008 | DOI: 10.1002/adfm.200700760

      Thumbnail image of graphical abstract

      A method of reversible patterning of tunable colloidal structures is reported. By application of an alternating electric field, we produce ordered colloidal patterns with the particle interactions that can be reversibly tuned on patterned electrodes. We demonstrate that this method is amenable to both large-scale on-chip patterning and microstructural control on a time scale of seconds.

    17. High-Performance, Low-Operating-Voltage Organic Field-Effect Transistors with Low Pinch-Off Voltages (pages 810–815)

      Weiping Wu, Yunqi Liu, Ying Wang, Hongxia Xi, Xike Gao, Chongan Di, Gui Yu, Wei Xu and Daoben Zhu

      Version of Record online: 26 FEB 2008 | DOI: 10.1002/adfm.200701125

      Thumbnail image of graphical abstract

      A general approach to organic field-effect transistors (OFETs) operated at low voltage by using donor/acceptor buffer layers is developed. p-Type OFETs on 500 nm SiO2 with acceptor molecule buffer layers (see figure) show reduced operating voltages (from 60–100 V reduced to 10–20 V), with mobility up to 0.19 cm2 V−1 s−1, an on/off ratio of 3 × 106 and a subthreshold slope of 1.68 V/decade at low drain–source voltage.

    18. Two-Dimensional Hexagonally-Ordered Mesoporous Carbon Nitrides with Tunable Pore Diameter, Surface Area and Nitrogen Content (pages 816–827)

      Ajayan Vinu

      Version of Record online: 11 MAR 2008 | DOI: 10.1002/adfm.200700783

      Thumbnail image of graphical abstract

      Two-dimensional mesoporous carbon nitride (MCN) with tunable textural parameters and the nitrogen content have been successfully prepared and the materials are highly active in the Friedel-Crafts acylation of benzene using hexanoyl chloride and show a high conversion and 100 product selectivity to caprophenone.

  5. Index

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Full Papers
    6. Index

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