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      Gold colloidal nanoparticle electrodeposition on a silicon surface in a uniform electric field

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      Author(s): 1 , 2 , , 1 , 1
      Publication date (Electronic):
      Journal: Nanoscale Research Letters
      Publisher: Springer

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          Abstract

          The electrodeposition of gold colloidal nanoparticles on a silicon wafer in a uniform electric field is investigated using scanning electron microscopy and homemade electrochemical cells. Dense and uniform distributions of particles are obtained with no aggregation. The evolution of surface particle density is analyzed in relation to several parameters: applied voltage, electric field, exchanged charge. Electrical, chemical, and electrohydrodynamical parameters are taken into account in describing the electromigration process.

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          Spontaneous organization of single CdTe nanoparticles into luminescent nanowires.

          Zhiyong Tang, Nicholas Kotov, Michael Giersig (2002)
          Nanoparticles of CdTe were found to spontaneously reorganize into crystalline nanowires upon controlled removal of the protective shell of organic stabilizer. The intermediate step in the nanowire formation was found to be pearl-necklace aggregates. Strong dipole-dipole interaction is believed to be the driving force of nanoparticle self-organization. The linear aggregates subsequently recrystallized into nanowires whose diameter was determined by the diameter of the nanoparticles. The produced nanowires have high aspect ratio, uniformity, and optical activity. These findings demonstrate the collective behavior of nanoparticles as well as a convenient, simple technique for production of one-dimensional semiconductor colloids suitable for subsequent processing into quantum-confined superstructures, materials, and devices.
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            Self-assembly of nanoparticles into structured spherical and network aggregates

            Boal, Ilhan, DeRouchey … (2000)
            Multi-scale ordering of materials is central for the application of molecular systems in macroscopic devices. Self-assembly based on selective control of non-covalent interactions provides a powerful tool for the creation of structured systems at a molecular level, and application of this methodology to macromolecular systems provides a means for extending such structures to macroscopic length scale. Monolayer-functionalized nanoparticles can be made with a wide variety of metallic and non-metallic cores, providing a versatile building block for such approaches. Here we present a polymer-mediated 'bricks and mortar' strategy for the ordering of nanoparticles into structured assemblies. This methodology allows monolayer-protected gold particles to self-assemble into structured aggregates while thermally controlling their size and morphology. Using 2-nm gold particles as building blocks, we show that spherical aggregates of size 97 +/- 17 nm can be produced at 23 degrees C, and that 0.5-1 microm spherical assemblies with (5-40) x 10(5) individual subunits form at -20 degrees C. Intriguingly, extended networks of approximately 50-nm subunits are formed at 10 degrees C, illustrating the potential of our approach for the formation of diverse structural motifs such as wires and rods. These findings demonstrate that the assembly process provides control over the resulting aggregates, while the modularity of the 'bricks and mortar' approach allows combinatorial control over the constituents, providing a versatile route to new materials systems.
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              Synthesis and characterization of helical multi-shell gold nanowires

              Takatoshi Takayanagi, Keiko Kondo (2000)
              Suspended gold nanowires were made in an ultra-high vacuum. The finest of them was 0.6 nanometer in diameter and 6 nanometers in length. By high-resolution electron microscopy, they were shown to have a multi-shell structure composed of coaxial tubes. Each tube consists of helical atom rows coiled round the wire axis. The difference between the numbers of atom rows in outer and inner shells is seven, resulting in magic shell-closing numbers.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Nanoscale Res Lett
                Title: Nanoscale Research Letters
                Publisher: Springer
                ISSN (Print): 1931-7573
                ISSN (Electronic): 1556-276X
                Publication date Collection: 2011
                Publication date (Electronic): 4 November 2011
                Volume: 6
                Issue: 1
                Page: 580
                Affiliations
                [1 ]CEA-Grenoble/INAC/SiNaPS-MINATEC 17 avenue des martyrs 38054 Grenoble, France
                [2 ]Université Joseph Fourier/IUT-1 17 quai C. Bernard 38000 Grenoble, France
                Article
                Publisher ID: 1556-276X-6-580
                DOI: 10.1186/1556-276X-6-580
                PMC ID: 3231992
                PubMed ID: 22053907
                SO-VID: 825ea6fc-6929-41c7-a140-dfdf5cb78ca1
                Copyright © Copyright ©2011 Buttard et al; licensee Springer.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 17 June 2011
                Date accepted : 4 November 2011
                Categories
                Subject: Nano Express

                ScienceOpen disciplines: Nanomaterials
                Data availability:
                ScienceOpen disciplines: Nanomaterials

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