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| - Mercury−Mercury Tunneling Junctions. 1. Electron Tunneling AcrossSymmetric and Asymmetric Alkanethiolate Bilayers
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| - Electron tunneling experiments involving Hg−Hg junctions incorporating two alkanethiolatemonolayers are described. Formation of a symmetric junction (Hg−SCn−CnS−Hg) is accomplished by bringingin contact two small (3 × 10-3 cm2) mercury drop electrodes in a 5−20% (v/v) hexadecane solution of analkanethiol. Formation of asymmetric junctions (Hg−SCn−CmS−Hg) and junctions containing n-alkane-3-thiopropanamide bilayers are also described. Tunneling currents in the junctions were measured for voltagebiases extending to ±1.5 V. The currents decrease exponentially with the junction thickness yielding thetunneling decay constant, β = 0.89 ± 0.1 per CH2. The decay constant exhibits only a weak dependence onthe voltage bias suggesting that electron tunneling follows a through-bond mechanism. Tunneling currents inthe n-alkane-3-thiopropanamide bilayer junctions were larger than those in alkanethiolate junctions with thesame number of atoms suggesting that introduction of an amide group increases the strength of the electroniccoupling through these types of σ-bonded systems.
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