Relative Conductances of Alkaneselenolate and Alkanethiolate Monolayers on Au{111}

Citations Over TimeTop 10% of 2005 papers

Abstract

The electronic properties of alkanethiolate [CH3(CH2)nS-, n = 9 and 11] and alkaneselenolate [CH3(CH2)nSe-, n = 9 and 11] self-assembled monolayers on Au{111} have been quantitatively compared. Simultaneously acquired apparent tunneling barrier height (ATBH) and scanning tunneling microscopy (STM) images reveal that alkanethiolate molecules have a lower barrier to tunneling, and therefore a higher conductance than alkaneselenolates of the same alkyl chain length. Molecular and contact conductance differences were elucidated by using observed STM topographic tunneling height differences between the analogous species. This apparent topographic difference combined with comparative ATBH data indicate that the observed decrease in conductance for alkaneselenolates compared to alkanethiolates originates exclusively from the Au-chalcogenide physical, chemical, and electronic contact.

Related Papers

• → Effect of Fluorination on the Molecular Packing of Perfluoropentacene and Pentacene Ultrathin Films on Ag (111)(2010)38 cited
• → Temperature dependent tunneling conductance of single molecule junctions(2017)37 cited
• → Self-Organized Monolayer Formation from Binary Mixtures of Substituted Alkyl Chains Studied by STM(2006)2 cited
• → Simulation of Self-Assembled Monolayers: Microscopic Structure of Amino Alkylthiols(1994)