A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9

The HYSENS consortium congratulate our partners on the publication of papers listed below.

Light-Emitting Electrochemical Cells Using Cyanine Dyes as the Active Components
Paper From: Universidad de Valencia
Published In: J. Am. Chem. Soc.
Reference: J. Am. Chem. Soc., 2013, 135 (48), pp 18008–18011 DOI: 10.1021/ja407515w
Authors: 2) A. Pertegás, D. Tordera, J.J. Serrano-Pérez, E. Ortí, H.J. Bolink
Abstract:
Abstract Image

Light-emitting electrochemical cells (LECs) based on cyanine molecules were prepared. High photoluminescence quantum yields were obtained for host–guest films using two cyanine dyes, reaching 27%. Sandwiching these films in between two electrodes allows for very stable near-infrared emission with a maximum radiant flux of 1.7 W m–2 at an external quantum efficiency of 0.44%.

Ion-selective organic electrochemical transistors
Paper From: Universidad de Valencia
Reference: Submitted for publication
Authors: Michele Sessolo, Jonathan Rivnay, Enrico Bandiello, George G. Malliaras and Henk J. Bolink
Synthesis, Optical Properties and Self-Assembly of Gold Nanorods
Paper From: Tyndall University College Cork
Published In: Journal of Experimental Nanoscience
Reference: JEN, 7, 2012, 688–702. DOI: 10.1080/17458080.2012.711915
Authors: A. Martín, C. Schopf, A. Pescaglini, A. O’Riordan, D. Iacopino
Abstract:

Noble metal nanostructures of different aspect ratios were synthesised and optically characterised at individual nanorod level. Rayleigh scattering spectroscopy/scanning electron microscopy measurements were performed to uniquely correlate optical signatures with nanorod size and shape. Scattering spectra of nanorods were dominated by the intense longitudinal surface plasmon resonance (SPR) band in the near-infrared part of the spectrum. This band was found to be highly shape and size dependent. Droplet evaporation techniques and application of dielectrophoretic forces have been used to organise nanorod dispersions into ordered arrays. Depending on the technique and nanoparticle size used, nanorods were found to form one, two or three dimensional (1D, 2D and 3D) superstructures. Within these superstructures nanorods organised themselves into end-to-end lines (1D), side-to-side fashion (2D) or hexagonal arrangements (3D).

Au Nanorod Plasmonic Superstructures Obtained by a Combined Droplet Evaporation and Stamping Method
Paper From: Tyndall University College Cork
Published In: J. Mater. Chem. C
Reference: J. Mater. Chem. C, 2014. DOI: 10.1039/C3TC32409E
Authors: C. Schopf, A. Martín, M. Burke, D. Jones, A. Pescaglini, A. O'Riordan, A. J. Quinn, D. Iacopino
Abstract:

A combined droplet evaporation and stamping method is presented for the fabrication of Au nanorod superstructures. Specifically, domains of nanorods parallel to the substrate in a close-packed side-to-side fashion are obtained by evaporation of Au chlorobenzene solutions, followed by stamping of the dried droplet on transparent substrates. To understand and optimize the assembly mechanism, synthetic parameters affecting the droplet evaporation process are carefully investigated. The optical characterization of individual domains shows markedly anisotropic extinction, confirming the high degree of internal order generated by aligned nanorods. In addition, the unique orientation of domains produces a unique distribution of color intensities, which is used for the initial demonstration of a novel plasmonic encoding/decoding system.


 

Graphical abstract: Au nanorod plasmonic superstructures obtained by a combined droplet evaporation and stamping method
Surface-Enhanced Raman Scattering of 4-Aminobenzenethiol on Au Nanorod Ordered Arrays
Paper From: Tyndall University College Cork
Published In: Journal of Physic–Chemistry C. RSC Advances
Reference: Submitted for publication
Authors: A. Martín, A. Pescaglini, C. Schopf, V. Scardaci, R. Coull, L. Byrne, D. Iacopino
Flexible SERS active Substrates from Ordered Vertical Au Nanorod Arrays
Paper From: Tyndall University College Cork
Reference: Submitted for publication
Authors: A. Martín, J. J. Wang, D. Iacopino
Direct Observation of Reversible Biomolecule Switching Controlled By Electrical Stimulus
Paper From: University of Birmingham
Published In: Adv. Mat. Interfaces
Reference: Adv. Mat. Interfaces, 2014, Accepted
Authors: A. Pranzetti, M. Davis, S. Song, C. L. Yeung, J. A. Preece, P. Koelsch, P. M. Mendes
Modulation of Biointeractions by Electrically Switchable Oligopeptide Surfaces: Structural Requirements and Mechanism
Paper From: University of Birmingham
Published In: Adv. Mat. Interfaces
Reference: Adv. Mat. Interfaces, 2014, DOI: 10.1002/admi.201300085
Authors: C. L. Yeung, X. Wang, M. Lashkor, E. Cantini, F. J. Rawson, P. Iqbal, J. A. Preece, J. Ma, P. M. Mendes
Abstract:

Understanding the dynamic behavior of switchable surfaces is of paramount importance for the development of controllable and tailor-made surface materials. Herein, electrically switchable mixed self-assembled monolayers based on oligopeptides have been investigated in order to elucidate their conformational mechanism and structural requirements for the regulation of biomolecular interactions between proteins and ligands appended to the end of surface tethered oligopeptides. The interaction of the neutravidin protein to a surface appended biotin ligand was chosen as a model system. All the considerable experimental data, taken together with detailed computational work, support a switching mechanism in which biomolecular interactions are controlled by conformational changes between fully extended (“ON” state) and collapsed (“OFF” state) oligopeptide conformer structures. In the fully extendedconformation, the biotin appended to the oligopeptide is largely free from steric factors allowing it to efficiently bind to the neutravidin from solution. While under a collapsed conformation, the ligand presented at the surface is partially embedded in the second component of the mixed SAM, and thus sterically shielded and inaccessible for neutravidin binding. Steric hindrances aroused from the neighboring surface-confined oligopeptide chains exert a great influence over the conformational behaviour of the oligopeptides, and as a consequence, over the switching efficiency. Our results also highlight the role of oligopeptide length in controlling binding switching efficiency. This study lays the foundation for designing and constructing dynamic surface materials with novel biological functions and capabilities, enabling their utilization in a wide variety of biological and medical applications.

Electrochemical properties of semiconductor quantum dots, in Quantum Dot Sensors: Technology and Commercial Applications
Paper From: University of Bologna
Published In: Pan Stanford Publishing
Authors: M. Amelia, A. Credi, S. Silvi
Tailoring of quantum dots emission efficiency by localized surface plasmon polaritons in self-organized mesoscopic rings
Paper From: University of Bologna
Published In: Nanoscale
Reference: Nanoscale. 2014 Jan 21;6(2):741-4. doi: 10.1039/c3nr04708c.
Authors: E. Margapoti, D. Gentili, M. Amelia, A. Credi, V. Morandi, M. Cavallini
Abstract:

We report on the tailoring of quantum dot (QD) emission efficiency by localized surface plasmon polaritons in self-organized mesoscopic rings. Ag nanoparticles (NPs) with CdSe QDs embedded in a polymeric matrix are spatially organised in mesoscopic rings and coupled in a tuneable fashion by breath figure formation. The mean distance between NPs and QDs and consequently the intensity of QD photoluminescence, which is enhanced by the coupling of surface plasmons and excitons, are tuned by acting on the NP concentration.

Synthesis and properties of ZnTe and ZnTe/ZnS core/shell semiconductor nanocrystals
Paper From: University of Bologna
Published In: J. Mater. Chem.
Reference: J. Mater. Chem. C, 2014,2, 2877-2886 DOI: 10.1039/C3TC32385D
Authors: C. Lincheneau, M. Amelia, M. Oszajca, A. Boccia, F. D'Orazi, M. Madrigale, R. Zanoni, R. Mazzaro, L. Ortolani, V. Morandi, S. Silvi, K. Szacilowski
Abstract:

We report the synthesis of spherical ZnTe nanocrystals and the successive coating with a ZnS shell to afford core/shell quantum dots. These nanocrystals can represent alternatives to cadmium-based quantum dots but their preparation and properties are challenging and relatively unexplored. The effect of various synthetic parameters on the reaction outcome was investigated, and the resulting nanocrystals were characterized by TEM, EDX, XPS, and spectroscopic measurements. The optical data indicate that these core/shell quantum dots belong to type I, i.e., both the electron and the hole are confined within the ZnTe core. Both the ZnTe core and ZnTe/ZnS core/shell quantum dot samples absorb in the visible region and are not luminescent. The ZnS shell preserves the optical properties of the core and improves the chemical and photochemical stability of the nanoparticles in air equilibrated solution, whereas they appear to be quite fragile in the solid state. XPS results have evidenced the distinct nature of core and core/shell QDs, confirming the formation of QDs with shells of different thicknesses and their evolution due to oxidation upon air exposure. Anodic photocurrent generation was observed when an ITO electrode functionalized with ZnTe/ZnS nanocrystals was irradiated in the visible region in a photoelectrochemical cell, indicating that the quantum dots perform spectral sensitization of the electron injection into the ITO electrode. Conversely, cathodic photocurrent generation was not observed; hence, the QD-modified electrode performs electrical rectification under a photon energy input.


 

Graphical abstract: Synthesis and properties of ZnTe and ZnTe/ZnS core/shell semiconductor nanocrystals
Supramolecular assemblies of semiconductor quantum dots and a bis(bipyridinium) derivative: luminescence quenching and aggregation phenomena
Paper From: University of Bologna
Published In: Submitted for publication
Authors: M. Oszajca, C. Lincheneau, T. Avellini, M. Baroncini, K. Szaciłowski, A. Credi
Fast and efficient method for surface functionalization and modulation of the solubility of luminescent semiconductor nanocrystals
Paper From: University of Bologna
Published In: Submitted for publication
Authors: T. Avellini, C. Lincheneau, I. A. Wright, E. C. Constable, S. Silvi, A. Credi
Correlation between structure and optoelectronic properties in a two-dimensional nanoparticle assembly
Paper From: Technical University of Munich
Published In: Phys. Status Solidi RRL
Reference: Phys. Status Solidi RRL 5, No. 1, 16-18 (2011). DOI: 10.1002/pssr.201004424
Authors: M. Mangold, M. Niedermeier, M. Rawolle, B. Dirks, J. Perlich, S. V. Roth, A. Holleitner, P. Müller-Buschbaum
Abstract:

The optical properties of two-dimensional assemblies of metal nanoparticles are strongly influenced by the morphological configuration of the metal particles in the layer. Therefore, we correlate the structural and optical properties of two-dimensional, hexagonal gold nanoparticle arrays. We characterize the structure of the arrays using grazing-incidence small angle X-ray scattering (GISAXS). From the GISAXS pattern, we determine the size of the gold particles as well as the lattice spacing of the hexagonal assembly. Based upon these parameters we calculate the dielectric function of the gold particle array using the Maxwell–Garnett effective medium theory. We further deduce the absorption spectrum which closely follows the measured absorption and photoconductance spectrum. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Optical Properties and Self-Assembly of Gold Nanrods
Paper From: Tyndall University College Cork
Published In: Phys. Status Solidi RRL
Reference: Journal of Experimental Nanoscience (Impact Factor: 0.88). 01/2012; 7:688-702. DOI:10.1080/17458080.2012.711915
Authors: A. Martin, C. Schopf, A. Pescaglini, A. O’Riordan, D. Iacopino
Abstract:

Noble metal nanostructures of different aspect ratios were synthesised and optically characterised at individual nanorod level. Rayleigh scattering spectroscopy/scanning electron microscopy measurements were performed to uniquely correlate optical signatures with nanorod size and shape. Scattering spectra of nanorods were dominated by the intense longitudinal surface plasmon resonance (SPR) band in the near-infrared part of the spectrum. This band was found to be highly shape and size dependent. Droplet evaporation techniques and application of dielectrophoretic forces have been used to organise nanorod dispersions into ordered arrays. Depending on the technique and nanoparticle size used, nanorods were found to form one, two or three dimensional (1D, 2D and 3D) superstructures. Within these superstructures nanorods organised themselves into end-to-end lines (1D), side-to-side fashion (2D) or hexagonal arrangements (3D).

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