Advanced Functional Materials

Cover image for Vol. 19 Issue 5

March 10, 2009

Volume 19, Issue 5

Pages 671–814

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Plasma Nanoparticle Synthesis: Luminescent Colloidal Dispersion of Silicon Quantum Dots from Microwave Plasma Synthesis: Exploring the Photoluminescence Behavior Across the Visible Spectrum (Adv. Funct. Mater. 5/2009)

      Anoop Gupta, Mark T. Swihart and Hartmut Wiggers

      Version of Record online: 27 FEB 2009 | DOI: 10.1002/adfm.200990014

      Thumbnail image of graphical abstract

      The cover picture shows a view into the plasma zone of a microwave plasma reactor, which is used to synthesize macroscopic quantities of single crystalline silicon nanoparticles with a very high production rate. These nanoparticles exhibit bright luminescence across the visible spectrum. On page 696, the authors report that the emission of such silicon nanoparticles can be tuned by changing their size and surface chemistry.

  2. Inside Front Cover

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Thin-Film Transistors: Transparent Photo-Stable Complementary Inverter with an Organic/Inorganic Nanohybrid Dielectric Layer (Adv. Funct. Mater. 5/2009)

      Min Suk Oh, Kimoon Lee, Kwang H. Lee, Sung Hoon Cha, Jeong Min Choi, Byoung H. Lee, Myung M. Sung and Seongil Im

      Version of Record online: 27 FEB 2009 | DOI: 10.1002/adfm.200990015

      Thumbnail image of graphical abstract

      On page 726, Minsuk Oh and co-workers describe the fabrication of a transparent complementary thin-film transistor inverter with a ZnO top gate and bottom gate of pentacene channels. Twelve nanometer-thin organic–inorganic hybrid dielectric layers with high capacitance are adopted to allow the ZnO and pentacene transistors to operate under only 3 V, and the inverter action appears very stable even under a few mW of white light. This discovery could herald the arrival of a new type of transparent logic device.

  3. Contents

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

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. N,N-Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis (pages 679–688)

      Isabel Pastoriza-Santos and Luis M. Liz-Marzán

      Version of Record online: 12 JAN 2009 | DOI: 10.1002/adfm.200801566

      Thumbnail image of graphical abstract

      The reduction of metal salts by N,N-dimethylformamide leads to the formation of metal colloids, with a variety of surface functionalities and particle morphologies, thus allowing a fine modulation of their optical response.

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Front Cover
    4. Contents
    5. Feature Article
    6. Full Papers
    7. Index
    1. Fluorimetric Nerve Gas Sensing Based on Pyrene Imines Incorporated into Films and Sub-Micrometer Fibers (pages 689–695)

      Jeremy M. Rathfon, Zoha M. AL-Badri, Raja Shunmugam, Scott M. Berry, Santosh Pabba, Robert S. Keynton, Robert W. Cohn and Gregory N. Tew

      Version of Record online: 29 JAN 2009 | DOI: 10.1002/adfm.200800947

      Thumbnail image of graphical abstract

      Fluorescent nerve gas sensing sub-micrometer fibers are fabricated using both a direct drawing approach and electrospinning. Detection of chloro-Sarin surrogate is measured via reaction and subsequent fluorescence of a new pyrene imine molecule. This sensing mechanism is proven to be fast, sensitive, and selective.

    2. Luminescent Colloidal Dispersion of Silicon Quantum Dots from Microwave Plasma Synthesis: Exploring the Photoluminescence Behavior Across the Visible Spectrum (pages 696–703)

      Anoop Gupta, Mark T. Swihart and Hartmut Wiggers

      Version of Record online: 6 FEB 2009 | DOI: 10.1002/adfm.200801548

      Thumbnail image of graphical abstract

      Highly luminescent silicon nanoparticles with emission across the entire visible spectrum are obtained by their controlled etching in a mixture of hydrofluoric acid and nitric acid. Surface modification of the etched silicon nanoparticles with different alkenes results in highly stable photolum inescence and allows their dispersion in a variety of organic solvents. This method of producing macroscopic quantities opens new avenues to applications of silicon quantum dots.

    3. Light-Emitting Rubrene Nanowire Arrays: A Comparison with Rubrene Single Crystals (pages 704–710)

      Jin Woo Lee, Kihyun Kim, Dong Hyuk Park, Mi Yeon Cho, Yong Baek Lee, Jin Sun Jung, Dae-Chul Kim, Jeongyong Kim and Jinsoo Joo

      Version of Record online: 2 FEB 2009 | DOI: 10.1002/adfm.200801180

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      A homogeneous array of light-emitting rubrene nanowires is fabricated through an organic vapor transport method by using an Al2O3 nanoporous template. The light emissions of an isolated single strand of rubrene nanowires are observed through nanometer-scale laser confocal microscope (LCM) photoluminescence (PL), and color charge-coupled device experiments. The line-width of LCM PL spectra for the single rubrene nanowire was much broader than that for rubrene single crystals, originating from the light emission of mixed polarized bands due to different crystal growth characteristics.

    4. New Approach Toward Fast Response Light-Emitting Electrochemical Cells Based on Neutral Iridium Complexes via Cation Transport (pages 711–717)

      Tae-Hyuk Kwon, Yong Ho Oh, Ik-Soo Shin and Jong-In Hong

      Version of Record online: 29 JAN 2009 | DOI: 10.1002/adfm.200801231

      Thumbnail image of graphical abstract

      Light-emitting cells (LECs) derived from a neutral Ir complex with Na+ exhibit a 60-fold faster turn-on time and a six-fold longer stability compared to an ionic Ir complex with PF6. This results from the fast distribution of the sodium ions. The maximum brightness of the LECs made with complexes of neutral Ir and Na+ reaches 990 cd m−2.

    5. Generic Method of Preparing Multifunctional Fluorescent Nanoparticles Using Flash NanoPrecipitation (pages 718–725)

      Mustafa Akbulut, Paul Ginart, Marian E. Gindy, Christian Theriault, Katherine H. Chin, Winston Soboyejo and Robert K. Prud'homme

      Version of Record online: 28 JAN 2009 | DOI: 10.1002/adfm.200801583

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      In Flash NanoPrecipitation (FNP), a hydrophobic or hydrophobically modified fluorophore and amphiphilic diblock copolymer are molecularly dissolved in a water miscible organic phase and very rapidly impinged against an aqueous anti-solvent stream to precipitate the active with a tunable, narrow submicrometer size distribution from 30 nm to 800 nm. The nanoparticles are protected from aggregation and sterically stabilized by the hydrophilic portion of the block copolymer. FNP is engineered assembly, and is driven by the sudden change in the solvent quality.

    6. Transparent Photo-Stable Complementary Inverter with an Organic/Inorganic Nanohybrid Dielectric Layer (pages 726–732)

      Min Suk Oh, Kimoon Lee, Kwang H. Lee, Sung Hoon Cha, Jeong Min Choi, Byoung H. Lee, Myung M. Sung and Seongil Im

      Version of Record online: 18 DEC 2008 | DOI: 10.1002/adfm.200801155

      Thumbnail image of graphical abstract

      A transparent complementary thin-film transistor (CTFT) inverter with an organic/inorganic nanohybrid dielectric (see figure) displays good transmittance in the visible range, over 60%, and shows electrically stable operation at less than 3 V, due to the unique device structure and good dielectric properties. This transparent CTFT inverter demonstrates a maximum voltage gain of ∼20 and very good photostability.

    7. Chitosan Hydrogel-Capped Porous SiO2 as a pH Responsive Nano-Valve for Triggered Release of Insulin (pages 733–741)

      Jianmin Wu and Michael J. Sailor

      Version of Record online: 22 JAN 2009 | DOI: 10.1002/adfm.200800921

      Thumbnail image of graphical abstract

      A porous SiO2 film containing a crosslinked chitosan hydrogel capping layer acts as a pH responsive reservoir for insulin. Changing the pH from 7.4 to 6.0 induces a volume phase transition in the hydrogel, releasing the drug payload. The volume phase transition of the hydrogel is monitored in real time by reflective interferometric Fourier transform spectroscopy (RIFTS).

    8. Fabrication of Large-Scale Single-Crystalline PrB6 Nanorods and Their Temperature-Dependent Electron Field Emission (pages 742–747)

      Qin Yuan Zhang, Jun Qi Xu, Yan Ming Zhao, Xiao Hong Ji and Shu Ping Lau

      Version of Record online: 2 FEB 2009 | DOI: 10.1002/adfm.200801248

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      Large-scale PrB6 nanorods are synthesized and characterized. The structural characterization reveals that the nanorods have a diameter of around 100 nm with a [001] growth direction and length that extends a few micrometers. The emission current of the PrB6 nanorods can be increased by one order of magnitude to 13.8 mA cm−2 when the temperature is increased from room temperature to 623 K.

    9. Luminescence of Nanocrystalline Erbium-Doped Yttria (pages 748–754)

      Yuanbing Mao, Thai Tran, Xia Guo, Jian Y. Huang, C. Ken Shih, Kang L. Wang and Jane P. Chang

      Version of Record online: 2 FEB 2009 | DOI: 10.1002/adfm.200800880

      Thumbnail image of graphical abstract

      Single-crystalline erbium-doped yttria nanoparticles with an average diameter of 80 nm are synthesized by a molten salt method. They show outstanding luminescent properties, including sharp and well-resolved photoluminescence lines in the IR region, outstanding green and red upconversion emissions, and excellent CL as well as photoluminescence emission intensity increase by annealing without spectral line shift.

    10. Electrosprayed Enzyme Coatings as Bioinspired Alternatives to Bioceramic Coatings for Orthopedic and Oral Implants (pages 755–762)

      Lise T. de Jonge, Sander C. G. Leeuwenburgh, Jeroen J. J. P. van den Beucken, Joop G. C. Wolke and John A. Jansen

      Version of Record online: 2 FEB 2009 | DOI: 10.1002/adfm.200800819

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      Alkaline phosphatase (ALP) enzyme coatings are proposed as a novel strategy for surface modification of biomedical implants in bone implantation. ALP triggers mineralization by hydrolyzing organic phosphate esters (ROP), thereby elevating the local concentration of inorganic phosphate (equation image) and increasing the driving force for physiological calcification (CaP) at the interface between synthetic matter and living tissue.

    11. Detailed Characterization of Contact Resistance, Gate-Bias-Dependent Field-Effect Mobility, and Short-Channel Effects with Microscale Elastomeric Single-Crystal Field-Effect Transistors (pages 763–771)

      Colin Reese and Zhenan Bao

      Version of Record online: 22 JAN 2009 | DOI: 10.1002/adfm.200801019

      Thumbnail image of graphical abstract

      Understanding scaling phenomena is critical for the ultimate success of organic electronic devices. Contact resistance, short-channel effects, and gate-bias-dependent field-effect mobility are explored using a photolithographically patterned device structure and organic single crystals. This approach allows the investigation of these phenomena free of device-to-device consistency and morphological effects.

    12. Synthesis, Characterization, and Field-Effect Transistor Performance of Thieno[3,2-b]thieno[2′,3′:4,5]thieno[2,3-d]thiophene Derivatives (pages 772–778)

      Ying Liu, Ying Wang, Weiping Wu, Yunqi Liu, Hongxia Xi, Limin Wang, Wenfeng Qiu, Kun Lu, Chunyan Du and Gui Yu

      Version of Record online: 2 FEB 2009 | DOI: 10.1002/adfm.200800829

      Thumbnail image of graphical abstract

      A series of functionalized thieno[3,2-b]thieno[2′,3′:4,5]thieno[2,3-d]thiophene derivatives composed of a tetrathienoacene core and symmetrically substituted benzene, biphenyl, and naphthalene are synthesized and fully characterized. The crystal structure of one of these derivatives, 1a, (see inset of the figure) shows π−π stacking and intermolecular S···S contacts. Field-effect transistors based on 1a demonstrated high performances with a mobility of 0.14 cm2 V−1 s−1 and an on/off ratio up to 106.

    13. Material Solubility-Photovoltaic Performance Relationship in the Design of Novel Fullerene Derivatives for Bulk Heterojunction Solar Cells (pages 779–788)

      Pavel A. Troshin, Harald Hoppe, Joachim Renz, Martin Egginger, Julia Yu. Mayorova, Andrey E. Goryachev, Alexander S. Peregudov, Rimma N. Lyubovskaya, Gerhard Gobsch, N. Serdar Sariciftci and Vladimir F. Razumov

      Version of Record online: 2 FEB 2009 | DOI: 10.1002/adfm.200801189

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      The investigation of 27 different fullerene derivatives as acceptor components in bulk heterojunction solar cells with P3HT as the donor polymer reveals a correlation between material solubility and photovoltaic performance.

    14. Monitoring the Channel Formation in Organic Field-Effect Transistors via Photoinduced Charge Transfer (pages 789–795)

      Thokchom Birendra Singh, Robert Koeppe, Niyazi Serdar Sariciftci, Mauro Morana and Christoph J. Brabec

      Version of Record online: 29 JAN 2009 | DOI: 10.1002/adfm.200801438

      Thumbnail image of graphical abstract

      A selective photoexcitation of a donor molecule Pc in the vicinity of an acceptor molecule C60 active layer allows for the photogeneration of charges directly at the semiconductor/dielectric interface via photoinduced charge transfer (see figure). This brings a direct correlation of the formation of a gate induced and a photoinduced channel in the same device.

    15. Spontaneous Formation of Complex Periodic Superstructures under High Interferential Illumination of Small-Molecule-Based Photochromic Materials (pages 796–804)

      Eléna Ishow, Rodolfo Camacho-Aguilera, Juliette Guérin, Arnaud Brosseau and Keitaro Nakatani

      Version of Record online: 28 JAN 2009 | DOI: 10.1002/adfm.200801497

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      The photoinduced mass transfer of bulky push-pull azo derivatives forming amorphous monomeric materials under interferential illumination is studied. Under a high-illumination regime, the surface relief gratings previously created are spontaneously replaced with periodic superstructures five to six times as high as the initial film thickness. These results suggest that surface-tension effects play a crucial role in the surface deformation.

    16. Photosensitization of TiO2 Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures (pages 805–811)

      David R. Baker and Prashant V. Kamat

      Version of Record online: 23 JAN 2009 | DOI: 10.1002/adfm.200801173

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      Anodically etched TiO2 nanotubes are sensitized with CdS quantum dots using the successive ionic layer adsorption and reaction (SILAR) method to compare the photoelectrochemical responses between one dimensional substrate architectures and nanoparticulate systems. Significant increases in photocurrent and incident photon to charge carrier efficiency are found with the nanotube architecture due to the directionality of the system reducing recombination rates.

  6. Index

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

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