The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform
Jaime Colchero - One of the best experts on this subject based on the ideXlab platform.
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Nanoscale Characterization of the Morphology and Electrostatic Properties of Poly(3‐octylthiophene)/Graphite‐Nanoparticle Blends
Advanced Functional Materials, 2006Co-Authors: E. Palacios-lidón, B Pérez-garcía, J. Abellán, C. Miguel, Antonio Urbina, Jaime ColcheroAbstract:Mixtures of poly(3-octylthiophene) (P3OT) with Graphite Nanoparticles have been investigated by scanning force microscopy (SFM) techniques. The morphology as well as the mechanical and electrical properties of the blends has been characterized at the nanoscale level as a function of the carbon Nanoparticle content in the blend. An increase in the concentration of carbon Nanoparticles results in an increase in the surface roughness of the blend and the appearance of distinct regions with well-defined electrical and mechanical properties. At intermediate concentrations (5–10 wt % of carbon Nanoparticles), the samples show pure P3OT regions, as well as round regions containing a mixture of the polymer and carbon Nanoparticles, while at higher concentrations (> 15 wt %), the entire sample is composed of this mixture. The interface between the two regions has been studied by electrostatic scanning force microscopy (ESFM) as a function of the applied tip–sample voltage. ESFM provides evidence for the creation of new electronic states at the heterojunction. The observed results can be qualitatively explained in terms of the electronic properties of the individual molecular components, P3OT, functionalized Graphite Nanoparticles, and their corresponding heterojunction. The implications of these results for organic polymer solar cells are also discussed.
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nanoscale characterization of the morphology and electrostatic properties of poly 3 octylthiophene Graphite Nanoparticle blends
Advanced Functional Materials, 2006Co-Authors: E Palacioslidon, J. Abellán, C. Miguel, Antonio Urbina, B Perezgarcia, Jaime ColcheroAbstract:Mixtures of poly(3-octylthiophene) (P3OT) with Graphite Nanoparticles have been investigated by scanning force microscopy (SFM) techniques. The morphology as well as the mechanical and electrical properties of the blends has been characterized at the nanoscale level as a function of the carbon Nanoparticle content in the blend. An increase in the concentration of carbon Nanoparticles results in an increase in the surface roughness of the blend and the appearance of distinct regions with well-defined electrical and mechanical properties. At intermediate concentrations (5–10 wt % of carbon Nanoparticles), the samples show pure P3OT regions, as well as round regions containing a mixture of the polymer and carbon Nanoparticles, while at higher concentrations (> 15 wt %), the entire sample is composed of this mixture. The interface between the two regions has been studied by electrostatic scanning force microscopy (ESFM) as a function of the applied tip–sample voltage. ESFM provides evidence for the creation of new electronic states at the heterojunction. The observed results can be qualitatively explained in terms of the electronic properties of the individual molecular components, P3OT, functionalized Graphite Nanoparticles, and their corresponding heterojunction. The implications of these results for organic polymer solar cells are also discussed.
Arben Merkoci - One of the best experts on this subject based on the ideXlab platform.
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enhanced electrochemical detection of heavy metals at heated Graphite Nanoparticle based screen printed electrodes
Journal of Materials Chemistry, 2011Co-Authors: Gemma Aragay, Josefina Pons, Arben MerkociAbstract:The effect of temperature upon the electrochemical stripping performance of a heavy metal sensor based on carbon Nanoparticles is studied. The morphological changes of the sensing surface during the multidetection of Cd2+, Pb2+, Cu2+ and Hg2+ ions are studied by TEM and SEM. The effect of the temperature on the heavy metal deposition using carbon Nanoparticle-based SPEs is also compared to a sensor that does not contain carbon Nanoparticles. The effect of temperature seems to be more pronounced for the Nanoparticle-based sensor. This phenomenon is clarified by the electrochemical response as well as the TEM and SEM images of the sensing materials used. In addition, the response performance of the Nanoparticle-based sensors for increasing concentrations of heavy metals from 5–100 μg L−1 for Cd2+, Pb2+ and Cu2+ and from 1 to 10 μg L−1 for Hg2+, in both single and multiple detections with potential for real applications, is presented. The Nanoparticle-based sensor seems to be stable for up to one month while being used in continuous monitoring of heavy metals in seawater.
E Palacioslidon - One of the best experts on this subject based on the ideXlab platform.
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nanoscale characterization of the morphology and electrostatic properties of poly 3 octylthiophene Graphite Nanoparticle blends
Advanced Functional Materials, 2006Co-Authors: E Palacioslidon, J. Abellán, C. Miguel, Antonio Urbina, B Perezgarcia, Jaime ColcheroAbstract:Mixtures of poly(3-octylthiophene) (P3OT) with Graphite Nanoparticles have been investigated by scanning force microscopy (SFM) techniques. The morphology as well as the mechanical and electrical properties of the blends has been characterized at the nanoscale level as a function of the carbon Nanoparticle content in the blend. An increase in the concentration of carbon Nanoparticles results in an increase in the surface roughness of the blend and the appearance of distinct regions with well-defined electrical and mechanical properties. At intermediate concentrations (5–10 wt % of carbon Nanoparticles), the samples show pure P3OT regions, as well as round regions containing a mixture of the polymer and carbon Nanoparticles, while at higher concentrations (> 15 wt %), the entire sample is composed of this mixture. The interface between the two regions has been studied by electrostatic scanning force microscopy (ESFM) as a function of the applied tip–sample voltage. ESFM provides evidence for the creation of new electronic states at the heterojunction. The observed results can be qualitatively explained in terms of the electronic properties of the individual molecular components, P3OT, functionalized Graphite Nanoparticles, and their corresponding heterojunction. The implications of these results for organic polymer solar cells are also discussed.
John P. Hart - One of the best experts on this subject based on the ideXlab platform.
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Development of a simple, low cost chronoamperometric assay for fructose based on a commercial Graphite-Nanoparticle modified screen-printed carbon electrode.
Food Chemistry, 2017Co-Authors: Phil Nicholas, R. Pittson, John P. HartAbstract:Abstract This paper describes the development of a simple, low cost chronoamperometric assay, for the measurement of fructose, using a Graphite-Nanoparticle modified screen-printed electrode (SPCE-G-COOH). Cyclic voltammetry showed that the response of the SPCE-G-COOH enhanced the sensitivity and precision, towards the enzymatically generated ferrocyanide species, over a plain SPCE; therefore the former was employed in subsequent studies. Calibration studies were carried out using chronoamperometry with a 40 µl mixture containing fructose, mediator and FDH, deposited onto the SPCE-G-COOH. The response was linear from 0.1 mM to 1.0 mM. A commercial fruit juice sample was analysed using the developed assay and the fructose concentration was calculated to be 477 mM with a precision of 3.03% (n = 5). Following fortification (477 mM fructose) the mean recovery was found to be 97.12% with a coefficient of variation of 6.42% (n = 5); consequently, the method holds promise for the analysis of commercial fruit juices.
Hart, John P. - One of the best experts on this subject based on the ideXlab platform.
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Development of a simple, low cost chronoamperometric assay for fructose based on a commercial Graphite-Nanoparticle modified screen-printed carbon electrode
'Elsevier BV', 2018Co-Authors: Nicholas Phil, Pittson Robin, Hart, John P.Abstract:© 2017 Elsevier Ltd This paper describes the development of a simple, low cost chronoamperometric assay, for the measurement of fructose, using a Graphite-Nanoparticle modified screen-printed electrode (SPCE-G-COOH). Cyclic voltammetry showed that the response of the SPCE-G-COOH enhanced the sensitivity and precision, towards the enzymatically generated ferrocyanide species, over a plain SPCE; therefore the former was employed in subsequent studies. Calibration studies were carried out using chronoamperometry with a 40 µl mixture containing fructose, mediator and FDH, deposited onto the SPCE-G-COOH. The response was linear from 0.1 mM to 1.0 mM. A commercial fruit juice sample was analysed using the developed assay and the fructose concentration was calculated to be 477 mM with a precision of 3.03% (n = 5). Following fortification (477 mM fructose) the mean recovery was found to be 97.12% with a coefficient of variation of 6.42% (n = 5); consequently, the method holds promise for the analysis of commercial fruit juices
