Abstract:During an investigation of the surface tension of liquid mixtures containing heptacosafluorotributylamine, (C4F9)3N, a need arose for the density dof the substance at temperatures t between 30 and 60 °C. A pycnometric study was therefore carried out with the results shown in Table I. Koch-Light Laboratories Ltd. supplied the material which was shown, by vapor phase chromatography, to contain only perfluorinated impurities below the 1
“…At higher forward bias, where the current is limited by tunneling through the molecular layer, the current decreases with increasing temperature. While the current decreases are small, they are reproducible and well above the noise in the measurements. , 3 Temperature-dependent current−voltage data of (a−c) n -Si−C n H 2 n +1 //Hg and (d) p -Si−C 18 H 37 //Hg, on semilogarithmic plots. In a−c at low forward bias, currents increase with temperature, whereas at higher bias, they decrease with temperature.…”
Temperature-dependent transport measurements through alkyl chain monolayers that are directly chemically bound to Si, show that the currents decrease as the temperature increases. We relate this temperature dependence primarily to a gradual un-tilting of the adsorbed molecules, which leads to increasing of the film thickness, resulting in a wider tunnel barrier. Following that, we conclude that a significant part of transport through these alkyl chain monolayers occurs "through space". The experimental finding and its interpretation result from the high reproducibility and accuracy of the transport results for the semiconductor/alkyl chain/ metal junctions that we study.
“…At higher forward bias, where the current is limited by tunneling through the molecular layer, the current decreases with increasing temperature. While the current decreases are small, they are reproducible and well above the noise in the measurements. , 3 Temperature-dependent current−voltage data of (a−c) n -Si−C n H 2 n +1 //Hg and (d) p -Si−C 18 H 37 //Hg, on semilogarithmic plots. In a−c at low forward bias, currents increase with temperature, whereas at higher bias, they decrease with temperature.…”
Temperature-dependent transport measurements through alkyl chain monolayers that are directly chemically bound to Si, show that the currents decrease as the temperature increases. We relate this temperature dependence primarily to a gradual un-tilting of the adsorbed molecules, which leads to increasing of the film thickness, resulting in a wider tunnel barrier. Following that, we conclude that a significant part of transport through these alkyl chain monolayers occurs "through space". The experimental finding and its interpretation result from the high reproducibility and accuracy of the transport results for the semiconductor/alkyl chain/ metal junctions that we study.
“…where d is an absolute value of the dipole moment of the 1octanethiol molecule; q is the charge of the lithium ion; R ¼ | L + nã| is the distance between the 1-octanethiol molecule and a given point charge; L is the distance between the dipole and the closest Li + from the rst ring of a point charges (2.5 Å); q is the angle between the dipole direction and the point charge; 3 is the relative permittivity of the 1-octanethiol solvent (in which WS 2 nanotubes were unzipped in the original experiment 13 ) which equals 3.896 F m À1 . 17 Based on these estimates we can conclude that the value of the energy released during the interaction between the dipole (1-octanethiol molecule) and the set of point charges equals 0.19 eV and the total energy gain from the interaction of the 1-octanethiol molecule with the lithium ions is 1.35 + 0.19 ¼ 1.54 eV per 1-octanethiol molecule.…”
Theoretical analysis of experimental data on unzipping multilayered WS₂ nanotubes by consequent intercalation of lithium atoms and 1-octanethiol molecules [C. Nethravathi, et al., ACS Nano, 2013, 7, 7311] is presented. The radial expansion of the tube was described using continuum thin-walled cylinder approximation with parameters evaluated from ab initio calculations. Assuming that the attractive driving force of the 1-octanethiol molecule is its reaction with the intercalated Li ions ab initio calculations of a 1-octanethiol molecule bonding with Li(+) were carried out. In addition, the non-chemical interactions of the 1-octanethiol dipole with an array of positive point charges representing Li(+) were taken into account. Comparing between the energy gain from these interactions and the elastic strain energy of the nanotube allows us to evaluate a value for the tube wall deformation after the implantation of 1-octanethiol molecules. The ab initio molecular dynamics simulation confirmed our estimates and demonstrated that a strained WS₂ nanotube, with a decent concentration of 1-octanethiol molecules, should indeed be unzipped into the WS₂ nanoribbon.
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