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21544441834
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note
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A microsyringe body (2.5 mm inner diameter) was used to maintain the area of the two facing Hg surfaces constant. A thiol solution was transferred to the syringe to form the first Hg-SAM interface. A calibrated drop of mercury (5 μL), previously stored in the thiol solution, was then rolled along the reclined syringe wall, bringing the second Hg-SAM surface gently into contact with the first one. Electrodes (50 μm diameter tungsten wire) were inserted into the drops. Solutions of thiols (1 mM) were prepared in ethanol, heptane, octane and hexadecane.
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21544461317
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note
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All the electric measurements were performed in a shielded box with a micromanipulator probe station.
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22
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21544432515
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note
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Shorter chain thiols cause the Hg surfaces to merge.
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23
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21544482914
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note
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The capacitance was measured at 120, 400, 1000 Hz with a LEADER LCR-745 meter.
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24
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21544478916
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note
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solv is determining the value of the capacitance.
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25
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0006163257
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26
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0003407246
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The permittivity of solvents at or near the surface is reduced as a consequence of the high molecular organization at the surface: Plenum New York
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The permittivity of solvents at or near the surface is reduced as a consequence of the high molecular organization at the surface: J. O'M. Bockris and A. K. N. Reddy, Modern Electrochemistry (Plenum New York, 1977).
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Modern Electrochemistry
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Bockris, J.O'M.1
Reddy, A.K.N.2
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27
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0029834220
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28
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21544483574
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note
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An Axopatch 1-D with a sensitivity of 0.1 pA from Axon Instruments Inc. was used for the measurements of leakage currents. Small voltages (from -150 to +150mV) were applied through the junction. Higher electric fields deform the mercury surfaces and damage the SAMs.
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29
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21544461594
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note
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Over a voltage range from +400 to -400mV, cyclic voltammetry does not show any redox reaction occurring at the Hg surfaces.
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30
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21544432779
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note
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When octane is used as solvent, stationary current values are reached instantaneously after applying the voltage. When alcohol is used as solvent, even after deoxygenation, the current reaches a constant value after a slow decay (Ixt=10-20pC). We attribute this small current to traces of impurities (traces of metal cations) present in the distilled ethanol.
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31
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9144258943
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In the limit of low electric field, electron tunneling theory predicts a linear I-V dependence, and allows for the determination of conductivity (σ=dI/dV); the conductivity is expected to decrease exponentially with the film thickness
-
In the limit of low electric field, electron tunneling theory predicts a linear I-V dependence, and allows for the determination of conductivity (σ=dI/dV); the conductivity is expected to decrease exponentially with the film thickness [J. G. Simmons, J. Appl. Phys. 34, 1793 (1963)].
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Simmons, J.G.1
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32
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0015144078
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Since the minimum thickness of the SAM/SAM dielectric is 2.9 nm, the tunneling contribution to the total current is expected to be negligible
-
Since the minimum thickness of the SAM/SAM dielectric is 2.9 nm, the tunneling contribution to the total current is expected to be negligible [B. Mann and H. Khun, J. Appl. Phys. 42, 4398 (1971)].
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Mann, B.1
Khun, H.2
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7544228907
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21544476783
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note
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The measurements were performed with a electrochemical interface Solartron EI 1287 and a frequency response analyzer Solartron FRA 1256.
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36
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21544434703
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note
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2=25.
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