The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform

S. Dev - One of the best experts on this subject based on the ideXlab platform.

  • Density and Electrical Conductance of Calcium Nitrate Tetrahydrate + Acetamide Melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev
    Abstract:

    Density and Electrical Conductance of the calcium nitrate tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar Conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific Conductance of molten calcium nitrate tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

  • density and Electrical Conductance of calcium nitrate tetrahydrate acetamide melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev
    Abstract:

    Density and Electrical Conductance of the calcium nitrate tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar Conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific Conductance of molten calcium nitrate tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

S. K. Chettri - One of the best experts on this subject based on the ideXlab platform.

  • Density and Electrical Conductance of Calcium Nitrate Tetrahydrate + Acetamide Melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev
    Abstract:

    Density and Electrical Conductance of the calcium nitrate tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar Conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific Conductance of molten calcium nitrate tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

  • density and Electrical Conductance of calcium nitrate tetrahydrate acetamide melt
    Journal of Chemical & Engineering Data, 1995
    Co-Authors: S. K. Chettri, S. Dev
    Abstract:

    Density and Electrical Conductance of the calcium nitrate tetrahydrate+acetamide melt were measured as functions of temperature and mole fraction of acetamide. On the basis of the additivity of molar volume, an alternative method has been suggested for estimating the densities of high- or low-melting anhydrous inorganic and organic salts using a suitable hydrate melt as solvent. Molar Conductance data were analyzed by using the Vogel-Tammann-Fulcher equation. At ambient temperature the specific Conductance of molten calcium nitrate tetrahydrate decreases by the addition of acetamide as was the case with the addition of KNO 3 −

Unwin, Patrick R. - One of the best experts on this subject based on the ideXlab platform.

  • Synchronous Electrical Conductance‐ and electron tunnelling‐scanning electrochemical microscopy measurements
    'Wiley', 2020
    Co-Authors: Edmondson James, Meloni, Gabriel N., Costantini Giovanni, Unwin, Patrick R.
    Abstract:

    The requirement to separate topographical effects from surface electrochemistry information is a major limitation of scanning electrochemical microscopy (SECM). With many applications of SECM involving the study of (semi)conducting electrode surfaces, the hybridisation of SECM with scanning tunnelling microscopy (STM) or a surface Conductance probe would provide the ultimate topographical imaging capability to SECM, but previous attempts are limited. Here, the conversion of a general scanning electrochemical probe microscopy (SEPM) platform to facilitate contact Electrical Conductance (C)‐ and electron tunnelling (T)‐SECM measurements is considered. Measurements in air under ambient conditions with a Pt/Ir wire tip are used to assess the performance of the piezoelectric positioning system. A hopping‐mode imaging protocol is implemented, whereby the tip approaches the surface at each pixel until a desired current magnitude is exceeded, and the corresponding z position (surface height) is recorded at a set of predefined xy coordinates in the plane of the surface. At slow tip approach rates, the current shows an exponential dependence on tip‐substrate distance, as expected for electron tunnelling. For measurements in electrochemical environments, in order to overcome well‐known problems with leakage currents at coated‐wire tips used for electrochemical STM, Pt‐sensitised carbon nanoelectrodes are used as tips. The hydrogen evolution reaction on 2D Au nanocrystals serves as an exemplar system for the successful simultaneous mapping of topography and electrochemical activity

  • Data for Synchronous Electrical Conductance and Electron Tunnelling-Scanning Electrochemical Microscopy Measurements
    'Wiley', 2020
    Co-Authors: Edmondson James, Meloni, Gabriel N., Costantini Giovanni, Unwin, Patrick R.
    Abstract:

    The requirement to separate topographical effects from surface electrochemistry information is a major limitation of scanning electrochemical microscopy (SECM). With many applications of SECM involving the study of (semi)conducting electrode surfaces, the hybridisation of SECM with scanning tunnelling microscopy (STM) or a surface Conductance probe would provide the ultimate topographical imaging capability to SECM, but previous attempts are limited. Here, the conversion of a general scanning electrochemical probe microscopy (SEPM) platform to facilitate contact Electrical Conductance (C)‐ and electron tunnelling (T)‐SECM measurements is considered. Measurements in air under ambient conditions with a Pt/Ir wire tip are used to assess the performance of the piezoelectric positioning system. A hopping‐mode imaging protocol is implemented, whereby the tip approaches the surface at each pixel until a desired current magnitude is exceeded, and the corresponding z position (surface height) is recorded at a set of predefined xy coordinates in the plane of the surface. At slow tip approach rates, the current shows an exponential dependence on tip‐substrate distance, as expected for electron tunnelling. For measurements in electrochemical environments, in order to overcome well‐known problems with leakage currents at coated‐wire tips used for electrochemical STM, Pt‐sensitised carbon nanoelectrodes are used as tips. The hydrogen evolution reaction on 2D Au nanocrystals serves as an exemplar system for the successful simultaneous mapping of topography and electrochemical activity

Manabu Kiguchi - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous measurement of Electrical Conductance and thermopower of single benzenedithiol molecular junctions
    Applied Physics Express, 2015
    Co-Authors: Satoshi Kaneko, Yuuga Nakamura, Ryuuji Matsushita, Santiago Marqués-gonzález, Manabu Kiguchi
    Abstract:

    We have developed a system for the simultaneous measurement of Electrical Conductance and thermopower of the single benzenedithiol (BDT) molecular junction, which was characterized by inelastic electron tunneling spectroscopy, at low temperature. The simultaneous measurements revealed a negative correlation between the Electrical Conductance and the thermopower. Strong metal–molecule coupling at the single BDT molecular junction leads to high Conductance and low thermopower because of the broadening of the conduction orbital, which explains the negative correlation. The observed fluctuation in Conductance and thermopower reflects the change in the metal–molecule contact configuration and molecular orientation.

  • Effect of the environment on the Electrical Conductance of the single benzene-1,4-diamine molecule junction.
    Beilstein Journal of Nanotechnology, 2011
    Co-Authors: Shigeto Nakashima, Yuuta Takahashi, Manabu Kiguchi
    Abstract:

    We investigated the effect of the environment on the Electrical Conductance of a single benzene-1,4-diamine (BDA) molecule bridging Au electrodes, using the scanning tunneling microscope (STM). The Conductance of the single BDA molecule junction decreased upon a change in the environment from tetraglyme, to mesitylene, to water, and finally to N2 gas, while the spread in the Conductance value increased. The order of the Conductance values of the single BDA molecule junction was explained by the strength of the interaction between the solvent molecules and the Au electrodes. The order of the spread in the Conductance values was explained by the diversity in the coverage of the BDA molecule at metal electrodes and atomic and molecular motion of the single-molecule junction.

  • Electrical Conductance of single C60 and benzene molecules bridging between Pt electrode
    Applied Physics Letters, 2009
    Co-Authors: Manabu Kiguchi
    Abstract:

    The Electrical Conductance of single C60 and benzene molecules bridging between Pt electrodes was investigated at room temperature in ultrahigh vacuum. The Conductance of the Pt/C60/Pt junction was 0.7 G0(2e2/h), which was close to that of the metal atomic contact. The single C60 molecular junction showed a high and fixed Conductance value, by the direct binding of the C60 to the Pt electrodes without using anchoring group. The Conductance of the Pt/C60/Pt junction decreased and its stability increased with the amount of deposited C60 molecule, which could be explained by the C60 adsorption on the stem part of the electrode. In contrast with the Pt/C60/Pt junction, the Pt/benzene/Pt junction did not show a fixed Conductance value, reflecting the planar molecular shape.

Songmin Shang - One of the best experts on this subject based on the ideXlab platform.

  • Nonvolatile memory devices based on Electrical Conductance tuning in poly(N-vinylcarbazole)-graphene composites
    Organic Electronics, 2012
    Co-Authors: Qiang Zhang, Jie Pan, Songmin Shang
    Abstract:

    Abstract Nonvolatile memory devices, based on Electrical Conductance tuning in thin films of poly(N-vinylcarbazole) (PVK)–graphene composites, are fabricated. The current density–voltage characteristics of the fabricated device show different Electrical Conductance behaviors, such as insulator behavior, write-once read-many-times (WORM) memory effect, rewritable memory effect and conductor behavior, which depend on the content of graphene in the PVK–graphene composites. The OFF and ON states of the WORM and rewritable memory devices are stable under a constant voltage stress or a continuous pulse voltage stress at a read voltage of −1.0 V. The memory mechanism is deduced from the modeling of the nature of currents in both states in the devices.

  • Microstructures and Electrical Conductance of silver nanocrystalline thin films on flexible polymer substrates
    Surface and Coatings Technology, 2010
    Co-Authors: R. X. Wang, Xiaoming Tao, Yu Wang, G. F. Wang, Songmin Shang
    Abstract:

    Using sputtering technique, silver nanocrystalline thin films were deposited on two different polymer substrates, namely pretreated nylon and polyester fabrics, under identical conditions. It is found that the difference of the Electrical Conductance between the two samples is quite large. The highest conductivity obtained from the coated nylon fabric is 2.4 x 10(7)Sm(-1), indicating the feasibility to fabricate wearable electrodes using silver coated fabrics. However, the Electrical Conductance of the coated polyester fibre is found to be lower by six orders of magnitude. Transmission electron microscopy reveals that the silver grains coated on the polyester fibre are spatially separated while the silver grains coated on the nylon fibre are connective. The pre-deposition surface conditions of the fibres are suggested to be responsible to the remarkable differences in the Electrical Conductance and microstructures of the silver nanocrystalline films.