Thursday, February 28, 2013

CO-Induced Smoluchowski Ripening of Pt Cluster Arrays on the Graphene/Ir(111) Moiré

Timm Gerber, Jan Knudsen, Peter J. Feibelman, Elin Grånäs, Patrick Stratmann, Karina Schulte, Jesper N. Andersen and Thomas Michely



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ACS Nano

DOI: 10.1021/nn400082w






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Atomic Layer Deposition of a Submonolayer Catalyst for the Enhanced Photoelectrochemical Performance of Water Oxidation with Hematite

Shannon C. Riha, Benjamin M. Klahr, Eric C. Tyo, Sönke Seifert, Stefan Vajda, Michael J. Pellin, Thomas W. Hamann and Alex B. F. Martinson



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ACS Nano

DOI: 10.1021/nn305639z






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InxGa1–xAs Nanowire Growth on Graphene: van der Waals Epitaxy Induced Phase Segregation

Parsian K. Mohseni, Ashkan Behnam, Joshua D. Wood, Christopher D. English, Joseph W. Lyding, Eric Pop and Xiuling Li



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Nano Letters

DOI: 10.1021/nl304569d






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Novel Planar-Structure Electrochemical Devices for Highly Flexible Semitransparent Power Generation/Storage Sources

Heng Li, Qing Zhao, Wei Wang, Hui Dong, Dongsheng Xu, Guijin Zou, Huiling Duan and Dapeng Yu



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Nano Letters

DOI: 10.1021/nl4000079






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Broad Electrical Tuning of Graphene-Loaded Plasmonic Antennas

Yu Yao, Mikhail A. Kats, Patrice Genevet, Nanfang Yu, Yi Song, Jing Kong and Federico Capasso



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Nano Letters

DOI: 10.1021/nl3047943






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Effect of Metal Impurities on the Tensile Strength of Carbon Nanotubes: A Theoretical Study

Qinghong Yuan, Li Li, Qianshu Li and Feng Ding



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The Journal of Physical Chemistry C

DOI: 10.1021/jp4001847






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Effects of Intramolecular Donor–Acceptor Interactions on Bimolecular Recombination in Small-Molecule Organic Photovoltaic Cells

Masaya Hirade, Takuma Yasuda and Chihaya Adachi



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The Journal of Physical Chemistry C

DOI: 10.1021/jp400386q






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The Role of TiO2 Doping on RuO2-Coated Electrodes for the Water Oxidation Reaction

Lars-Åke Näslund, Carlos M. Sánchez-Sánchez, Árni S. Ingason, Joakim Bäckström, Enrique Herrero, Johanna Rosen and Susanne Holmin



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The Journal of Physical Chemistry C

DOI: 10.1021/jp308941g






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How Thick is the Interphase in an Ultrathin Polymer Film? Coarse-Grained Molecular Dynamics Simulations of Polyamide-6,6 on Graphene

Hossein Eslami and Florian Müller-Plathe



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The Journal of Physical Chemistry C

DOI: 10.1021/jp400142h






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Edge–Edge Interactions in Stacked Graphene Nanoplatelets

Eduardo Cruz-Silva, Xiaoting Jia, Humberto Terrones, Bobby G. Sumpter, Mauricio Terrones, Mildred S. Dresselhaus and Vincent Meunier



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ACS Nano

DOI: 10.1021/nn4004204






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Surface Polyethylene Glycol Conformation Influences the Protein Corona of Polyethylene Glycol-Modified Single-Walled Carbon Nanotubes: Potential Implications on Biological Performance

Cristiano Sacchetti, Khatereh Motamedchaboki, Andrea Magrini, Graziana Palmieri, Maurizio Mattei, Sergio Bernardini, Nicola Rosato, Nunzio Bottini and Massimo Bottini



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ACS Nano

DOI: 10.1021/nn400409h






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Surface Charge and Cellular Processing of Covalently Functionalized Multiwall Carbon Nanotubes Determine Pulmonary Toxicity

Ruibin Li, Xiang Wang, Zhaoxia Ji, Bingbing Sun, Haiyuan Zhang, Chong Hyun Chang, Sijie Lin, Huan Meng, Yu-Pei Liao, Meiying Wang, Zongxi Li, Angela A. Hwang, Tze-Bin Song, Run Xu, Yang Yang, Jeffrey I. Zink, André E. Nel and Tian Xia



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ACS Nano

DOI: 10.1021/nn305567s






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Optical Response of Individual Au–Ag@SiO2 Heterodimers

Anna Lombardi, Marcin P. Grzelczak, Aurélien Crut, Paolo Maioli, Isabel Pastoriza-Santos, Luis M. Liz-Marzán, Natalia Del Fatti and Fabrice Vallée



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ACS Nano

DOI: 10.1021/nn305865h






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Luminescent behavior of cadmium sulfide quantum dots for gallic acid estimation

Suman Singh, Sourav Garg, Jitender Chahal, Khushboo Raheja, Deepak Singh and M L Singla



Thioglycolic acid capped cadmium sulfide (CdS/T) quantum dots have been synthesized using wet chemistry and their optical behavior has been investigated using UV–visible absorption and fluorescence spectroscopy. The role of the capping agent, sulfide source concentration, pH and temperature has been studied and discussed. Studies showed that alkaline pH leads to a decrease in the size of quantum dots and reflux temperature above 70 °C resulted in red-shift of emission spectra which is due to narrowing of the bandgap. Further, to reduce the toxicity and photochemical instability of quantum dots, the quantum dots have been functionalized with polyethylene glycol (PEG), which resulted in a 20% enhancement of the fluorescence intensity. The application potential of CdS/T-PEG quantum dots was further studied using gallic acid as a model compound. The sensing is based on fluorescence quenching of quantum dots in the presence of gallic acid, and this study showed linearity in the range ...



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Molecular dynamics simulation of inertial trapping-induced atomic scale mass transport inside single walled carbon nanotubes

(author unknown)



Z. L. Hu, Gustaf Mårtensson, and Murali Murugesan et al.

The forced transverse vibration of a single-walled carbon nanotube (SWNT) embedded with atomic-size particles was investigated using molecular dynamic simulations. The particles inside the cylindrical cantilever can be trapped near the antinodes or at the vicinity of the SWNT tip. The trapping phe ... [Appl. Phys. Lett. 102, 083108 (2013)] published Thu Feb 28, 2013.



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Towards the engineering of molecular nanostructures: local anchoring and functionalization of porphyrins on model-templates

Stefanie Ditze, Michael Röckert, Florian Buchner, Elisabeth Zillner, Michael Stark, Hans-Peter Steinrück and Hubertus Marbach



We demonstrate that Cu(111) surfaces pre-covered with a submonolayer of copper oxide or metallic nickel are suitable model-templates for the selective adsorption and/or localized functionalization of functional molecules such as different free base porphyrins and metalloporphyrins. The oxide/Cu(111) model-template is able to steer the adsorption of tetraphenylporphyrins (TPP): 2HTPP selectively adsorbs on the bare Cu areas, and for CoTPP anchoring at the rim of the copper oxide islands is found. On the Ni/Cu(111) model-template TPP molecules are pinned on the Ni areas while they are mobile on the bare Cu surface. Interestingly, adsorption of free base octaethylporphyrin on Ni/Cu(111) leads to a local functionalization, namely the metalation to NiOEP on the Ni areas. Model-template preparation and characterization by scanning tunneling microscopy is performed at room temperature.



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Electrochemical current-sensing atomic force microscopy in conductive solutions

Ilya V Pobelov, Miklós Mohos, Koji Yoshida, Viliam Kolivoska, Amra Avdic, Alois Lugstein, Emmerich Bertagnolli, Kelly Leonhardt, Guy Denuault, Bernhard Gollas and Thomas Wandlowski



Insulated atomic force microscopy probes carrying gold conductive tips were fabricated and employed as bifunctional force and current sensors in electrolyte solutions under electrochemical potential control. The application of the probes for current-sensing imaging, force and current–distance spectroscopy as well as scanning electrochemical microscopy experiments was demonstrated.



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Synthesis of silver nanoparticles in melts of amphiphilic polyesters

S Vasylyev, C Damm, D Segets, M Hanisch, N Taccardi, P Wasserscheid and W Peukert



The current work presents a one-step procedure for the synthesis of amphiphilic silver nanoparticles suitable for production of silver-filled polymeric materials. This solvent free synthesis via reduction of Tollens’ reagent as silver precursor in melts of amphiphilic polyesters consisting of hydrophilic poly(ethylene glycol) blocks and hydrophobic alkyl chains allows the production of silver nanoparticles without any by-product formation. This makes them especially interesting for the production of medical devices with antimicrobial properties. In this article the influences of the chain length of the hydrophobic block in the amphiphilic polyesters and the process temperature on the particle size distribution (PSD) and the stability of the particles against agglomeration are discussed. According to the results of spectroscopic and viscosimetric investigations the silver precursor is reduced to elemental silver nanoparticles by a single electron transfer process from the poly(eth...



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Application of solution-processed metal oxide layers as charge transport layers for CdSe/ZnS quantum-dot LEDs

Huu Tuan Nguyen, Nang Dinh Nguyen and Soonil Lee



We fabricated and characterized quantum-dot light emitting devices (QLEDs) that consisted of a CdSe/ZnS quantum-dot (QD) emitting layer, a hole-transporting nickel oxide (NiO) layer and/or an electron-transporting zinc oxide (ZnO) layer. Both the p-type NiO and n-type ZnO layers were formed by using sol–gel processes. All the fabricated CdSe/ZnS QLEDs showed similar electroluminescence spectra that originated from the green CdSe/ZnS QDs. However, different combinations of hole- and electron-transporting layers resulted in efficiency variations. In addition to the control of the respective concentrations of holes and electrons within a multilayer device structure, which determines the luminance and efficiency of QLEDs, the use of metal oxide layers is advantageous for long-term stability of QLEDs because they are air stable and can block the permeation of water vapor and oxygen in ambient air to a QD emitting layer. Moreover, the wet chemistry processing for their formation makes...



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Synthesis of reduced graphene oxide/CeO 2 nanocomposites and their photocatalytic properties

Zhenyuan Ji, Xiaoping Shen, Minzhi Li, Hu Zhou, Guoxing Zhu and Kangmin Chen



With a unique structure and extraordinary properties, graphene has attracted tremendous attention in the preparation of graphene-based composites for various applications. In this study, two different strategies, including in situ growth and a self-assembly approach, have been developed to load CeO 2 nanoparticles onto reduced graphene oxide (RGO) nanosheets. The microstructure and morphology of the as-synthesized RGO/CeO 2 nanocomposites were investigated by x-ray diffraction, Raman spectroscopy and transmission electron microscopy. The results reveal that CeO 2 nanoparticles with well-controlled size and a uniform distribution on RGO sheets with tunable density can be achieved through the self-assembly approach. The significantly enhanced photocatalytic activity of the RGO/CeO 2 nanocomposites in comparison with bare CeO 2 nanoparticles was revealed by the degradation of methylene blue under simulated sunlight irradiation...



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GaAs nanowire growth on polycrystalline silicon thin films using selective-area MOVPE

Keitaro Ikejiri, Fumiya Ishizaka, Katsuhiro Tomioka and Takashi Fukui



The growth mechanism of GaAs nanowires (NWs) grown on polycrystalline silicon (poly-Si) thin films using selective-area metalorganic vapor-phase epitaxy was investigated. Wire structures were selectively grown in the mask openings on a poly-Si substrate. The appearance ratio of wire structures strongly depended on the growth conditions and deposition temperature of the poly-Si substrate. Evaluation of the grown shapes and growth characteristics revealed that GaAs NWs grown on a poly-Si substrate have the same growth mechanism as conventional GaAs NWs grown on a single-crystalline GaAs or Si substrate. Experiments showed that the wire structure yield can be improved by increasing the Si grain size and/or increasing the Si deposition temperature. The growth model proposed for understanding NW growth on poly-Si is based on the mask opening size, the Si grain size, and the growth conditions. The ability to control the growth mode is promising for the formation of NWs with complex str...



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Mapping the local elastic properties of nanostructured germanium surfaces: from nanoporous sponges to self-organized nanodots

(author unknown)



Due to their reduced dimensions, the mechanical properties of nanostructures may differ substantially from those of bulk materials. Quantifying and understanding the nanomechanical properties of individual nanostructures is thus of tremendous importance both from a fundamental and a technological point of view. Here we employ a recently introduced atomic force microscopy mode, i.e., peak-force quantitative nanomechanical imaging, to map the local elastic properties of nanostructured germanium surfaces. This imaging mode allows the quantitative determination of the Young’s modulus with nanometer resolution. Heavy-ion irradiation was used to fabricate different self-organized nanostructures on germanium surfaces. Depending on the sample temperature during irradiation, nanoporous sponge-like structures and hexagonally ordered nanodots are obtained. The sponge-like germanium surface is found to exhibit a surprisingly low Young’s modulus well below 10 GPa, which furthermore depends on...



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Converting an Electrical Insulator into a Dielectric Capacitor: End-Capping Polystyrene with Oligoaniline

Christopher G. Hardy, Md. Sayful Islam, Dioni Gonzalez-Delozier, Joel E. Morgan, Brandon Cash, Brian C. Benicewicz, Harry J. Ploehn and Chuanbing Tang



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Chemistry of Materials

DOI: 10.1021/cm304057f






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A Solution NMR Toolbox for Characterizing the Surface Chemistry of Colloidal Nanocrystals

Zeger Hens and José C. Martins



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Chemistry of Materials

DOI: 10.1021/cm303361s






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Bistability of Fc-PTM-Based Dyads: The Role of the Donor Strength

Judith Guasch, Luca Grisanti, Stefan Jung, Dayana Morales, Gabriele D’Avino, Manuel Souto, Xavier Fontrodona, Anna Painelli, Franz Renz, Imma Ratera and Jaume Veciana



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Chemistry of Materials

DOI: 10.1021/cm400147p






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Fabrication of Arrays of Lead Zirconate Titanate (PZT) Nanodots via Block Copolymer Self-Assembly

Justin Varghese, Tandra Ghoshal, Nitin Deepak, Colm O’Regan, Roger W. Whatmore, Michael A. Morris and Justin D. Holmes



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Chemistry of Materials

DOI: 10.1021/cm303759r






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