Alkanethiol self-assembled monolayers as the dielectric of capacitors with nanoscale thickness
- 6 April 1998
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 72 (14) , 1781-1783
- https://doi.org/10.1063/1.121183
Abstract
Alkanethiol self-assembled monolayers (SAMs) on a mercury surface are used to build a junction consisting of two opposing mercury surfaces with interposed SAMs: Hg-SAM/SAM-Hg. The liquid mercury surface provides a support for the SAM that is smooth, compliant, free of defects, and without the incommensurate lattice properties that characterize solid metal surfaces. The thickness of the dielectric (∼30–90 Å) in this junction can be easily changed by using alkanethiols with different lengths. From capacitance measurements, a dielectric constant of 2.7±0.3 is calculated for the SAMs. The conductivity of SAMs on the Hg surface is σ=6±2×10−15 Ω−1 cm−1, a value close to that of bulk polyethylene. The junction sustains an electric field of 6 MV/cm.Keywords
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