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We here report the synthesis of a new donor copolymer family based on benzobistriazole and dithienosilole. In the present work, the separation and purification of bromo-benzobistriazole isomers was realized for the first time, allowing the synthesis of a series of monomers with different positions of the solubilising alkyl chains. The thermal, photophysical and electrochemical properties of resulting...
The integration of optical source with microfluidics leads to promising low-cost, rapid and sensitive lab-on-a-chip analytical systems. This work deals with the optimization of the electrochemical sensors and the dedicated organic light-emitting diode (OLED) for the monitoring of herbicides though algal photo synthetic activities disturbances. Various blue OLED are considered in order to achieve highest...
Selective detection of vapor species, specially belonging to the same group, is a major constraint for resistive sensor devices. In this paper, selective alcohol (methanol, ethanol and 2-propanol) detection of Pd/TiO2 nanorod array/Ti (Metal-Insulator-Metal) device in capacitive mode was achieved by a resonant frequency tuning technique. The resonant frequency, for optimal sensing, is identified through...
This paper studies changes in the surface chemistry of carbon nanotubes (CNTs) while they are under ultra-sonication process in Jeffamine D-230 polyetheramine medium. Jeffamine is used as curing agent in the nanocomposite manufacturing process. In the nanocomposite technology, ultrasonication process is employed as a method for dispersion of CNTs in a suspension. This research tries to investigate...
Combining low-dimensional nanomaterials into hybrid nanostructures is a promising avenue to obtain enhanced material properties and to achieve nanodevices operating with novel principles. The family of carbon allotropes, with its rich chemistry and physics, attracts a great deal of attentions in forming novel hybrid nanostructures. In particular, the excellent electrical conductivities and large specific...
Heterogeneous single wall carbon nanotubes and graphene were synthesized using the electric arc method. The arc conditions were monitored to study the correlation between the operating parameters and the obtained products. Substitution with boron and/or nitrogen was confirmed through spectroscopic chemical analyses. It was found that, as soon as N is present in suitable amount, the formation of BN...
We discuss fabrication, characterization of graphene sensor for detection of different gases at low pressure. Two types of micro devices were fabricated, the first one is the kelvin structure and the second one is the membrane structure. Cavities were etched in the SiO2 to form the membrane. Two techniques for synthesis of Graphene was used in this work: Chemical vapor deposition using Cu as catalyst...
In this study, ab-initio calculations were performed to obtain phonon dispersions of single, bilayer graphene, and graphite structures. Using these dispersions single mode relaxation times, thermal conductivities, and mean free paths (MFPs) have been calculated. Finally, calculated variables were used to understand the effects of additional layers to thermophysical properties, phonon mode contributions...
New results on the nanoscale mechanics of shale and the nano-mechanics and nano-chemistry of asphalt binder (bitumen) will be presented in the context of the history and promise of atomic force microscopy.
Field-coupled nanocomputing (FCN) paradigms offer fundamentally new approaches for digital computing. As one of several FCN paradigms currently under active investigation, Molecular Quantum-dot Cellular Automata (MQCA) is based upon electrostatic interactions among quantum dot cells that does not require charge transport. Hence its energy dissipation is significantly reduced. Moreover, an external...
The interaction of proteins with silver nanoparticles (AgNPs) is of primary importance to uncover silver antimicrobial efficiency and environmental hazard. This interaction can affect silver reactivity, bioavailability and, eventually, silver toxicity towards the environmental media. Detection of the interaction of DsRed fluorescent proteins with AgNPs embedded in thin silica layers is demonstrated...
We report here the fabrication and the electrochemical characterization of recessed disk microelectrodes (rDME) and recessed ring nanoelectrodes (rRNE) integrated into microwell arrays. The technological process based on the reactive ion etching of a SiO2/Ti/Pt/Ti/SiO2 stack is optimized in order to realize functional electrochemical microdevices on glass substrate and so, enable the coupling of amperometric...
The novel features, based on the exposure of a higher number of atoms on the surfaces, allow nanomaterials to exhibit new or improved features to consumer products, that should be carefully assessed. Here is presented a new method based on the use of biosensors (algal cells) to assess the release of dissolved silver from nanoparticles. Algae were exposed to a) differently coated nanoparticles, b)...
Studies on [Pt(II)(di-tert-butylSalophen)] which is thermally stable (Td = 390°C) and displays a deep-red emission (Imax = 660 nm) are presented. Based on efficient energy transfer, this Pt(II) complex was used as a probe for exciton formation in organic light-emitting diodes (OLEDs). Electrical characterisation of host-guest system based devices showed that the presence of the Pt(II) complex within...
A process for the fabrication of organic thin-film transistors (TFTs) with channel lengths as short as 0.5 μm on flexible plastic substrates has been developed. The TFTs are fabricated in the bottom-gate, top-contact (inverted staggered) architecture and employ vacuum-deposited small-molecule organic semiconductors and a low-temperature-processed gate dielectric that is sufficiently thin to allow...
The tailoring of optical properties of photonic nanostructures is usually based on a reference design. The target optical behavior is obtained by variations of an initial geometry. This approach however can be of limited versatility, in particular if complex optical properties are desired. In order to design double-resonant photonic nano-particles, we attack the problem in the inverse way: We mathematically...
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