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Journal of Self-Assembly and Molecular Electronics

Open Access

Baoquan Ding, National Center for Nanoscience and Technology, China
Peter Fojan, Aalborg University, Denmark
Leonid Gurevich, Aalborg University, Denmark

ISSN: 2245-4551 (Print Version),

ISSN: 2245-8824 (Online Version)
Vol: 1   Issue: 2

Published In:   June 2013

Publication Frequency: Continuous Article Publication

Search Available Volume and Issue for Journal of Self-Assembly and Molecular Electronics

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Experimental Investigation of Self-Assembled Opal Structures by Atomic Force Microscopy, Spectroscopic Ellipsometry and Reflectometry

doi: https://doi.org/10.13052/jsame2245-4551.124
Natalia Alekseeva1, Grigory Cema1, Aleksey Lukin1, Svetlana Pan’kova1, Sergei Romanov2, Vladimir Solovyev1, Victor Veisman1 and Mikhail Yanikov1

1Department of Physics, Faculty of Physics and Mathematics, Pskov State University, Lenin Square 2, 180000 Pskov, Russia
2Institute of Optics, Information and Photonics, University of Erlangen-Nürnberg, Haber Str. 9a, 91058 Erlangen, Germany; Ioffe Physical Technical Institute, Polytechnicheskaya Street, 26,194021 St. Petersburg, Russia,

Abstract: [+]    |    Download File [ 1462KB ]    |   Read Article Online

Abstract: Self-assembled opal crystals (bulk silica opals and PMMA thin opal films) have been studied by atomic force microscopy (AFM) and optical spectroscopy. Reflectance and transmittance spectra (R(λ) and T(λ), respectively) as well as spectra of ellipsometric parameters Ψ(λ) and Δ(λ)demonstrate pronounced changes with changing the angle of light incidence. Diameters of spheres obtained from AFM-images correspond to those obtained from Bragg fit to the diffraction resonance dispersions. The band of light losses detected by ellipsometry at the spectral range of avoided band crossing of opal eigenmodes was assigned to the energy exchange between these modes.

Keywords: opal, photonic crystal, Bragg diffraction, photonic bandgap structure, reflectance and transmittance spectra, ellipsometry, atomic force microscopy.

The Many Faces of Diphenylalanine

doi: https://doi.org/10.13052/jsame2245-4551.123
Mohtadin Hashemi, Peter Fojan and Leonid Gurevich

Institute of Physics and Nanotechnology, Aalborg University, 9220 Aalborg East, Denmark

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Abstract: Diphenylalanine dipeptide is well known to form complex self-assembled structures, including peptide nanowires, with morphologies depending on Nand C-terminal modifications. Here we report that significant morphological variations of self-assembled structures are attainable through pH variation of unmodified diphenylalanine in trifluoroethanol. The obtained self-assembled diphenylalanine nanostructures are found to vary drastically with pH, incubation time, and diphenylalanine concentration in solution. The observed structures ranged from structured films at neutral and alkaline conditions to vertically aligned nanowires and sponge-like structures at acidic conditions. In comparison to the commonly described procedure of diphenylaniline nanowire growth through aniline vapor treatment, our results suggest that strictly anhydrous conditions are not necessarily required.

Keywords: Diphenylalanine, peptide self-assembly, peptide nanowires, peptide nanotubes

Integrating DNA with Functional Nanomaterials

doi: https://doi.org/10.13052/jsame2245-4551.122
Shalom J. Wind,1 Erika Penzo,1 Matteo Palma,1 Risheng Wang,1 Teresa Fazio,1 Danny Porath,2 Dvir Rotem,2 Gideon Livshits,2 Avigail Stern2

1Department of Applied Physics and Applied Mathematics Columbia University, New York, NY, USA
1Department of Chemistry Hebrew University of Jerusalem, Jerusalem, Israel

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Abstract: DNA may be the most versatile molecule discovered to date. Beyond its well-known central role in genetics, DNA has the potential to be a remarkably useful technological material. It has been demonstrated as a scaffold for the assembly of organic and inorganic nanomaterials [1]; a vehicle for drug delivery [2]; a medium for computation [3]; and a possible wire for transporting electrical signals [4]. A key factor in exploiting DNA in these ways is the ability to integrate DNA with other materials. In this paper, we review two approaches to forming DNA complexes with functional nanomaterials: (1) linking DNA with single-wall carbon nanotubes (SWCNTs), which can then be used as nanoscale electrical contacts for probing electron transport in DNA; and (2) directed nanoassembly of Au nanoparticles using DNA/PNA (peptide nucleic acid) hybrid scaffolds.

Keywords: DNA-SWCNT

Supramolecular organization of bimetallic building blocks: From structural divertimentos to potential applications

doi: https://doi.org/10.13052/jsame2245-4551.121
Ruben Mas-Balleste and Felix Zamora

Departamento de Química Inorgánica, Universidad Autónoma de Madrid, 28049 Madrid, Spain

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Abstract: The phenomena that results on supramolecular aggregations of bimetallic [Pt2 L4 ] and [AuL2 ] are reviewed. Supramolecular [AuL2]n (n=2,3) were observed in some cases in solution as a result of Au(I)···Au(I) aurophilic interactions, which also direct the assembly of oligomeric structures in crystal phase. Analogously, Pt(II)···Pt(II) attraction accounts for the assembly of [Pt2 L4 ]n supramolecules which can result on 1D semiconductive arrangements in crystal phase and direct the formation of 1D nanofibres on surfaces. Finally, oxidation of [Pt2L4] to [Pt2L4]n produces highly conductive polymers that can reversibly assemble/disassemble into [Pt2L4] and [Pt2L4]. Such outstanding ability results on an unprecedented processability that enables MMX polymers for technological applications as molecular wires.

Keywords: Metal-metal interactions, Supramolecular assemblies, MMX Chains, Molecular wires.

River Publishers: Journal of Self-Assembly and Molecular Electronics