Conference Proceedings


Colm O'Dwyer



scanning tunneling microscopy stm chemistry molecular dynamics materials science organosulfur compounds organic monolayers x ray helium atom diffraction

Adsorption of alkanethiol self-assembled monolayers on sputtered gold substrates for atomic nanolithography applications (2004)

Abstract A detailed study of the self-assembly and coverage by 1-nonanethiol of sputtered Au surfaces using molecular resolution atomic force microscopy (AFM) and scanning tunneling microscopy (STM) is presented. The monolayer self-assembles on a smooth Au surface composed predominantly of {111} oriented grains. The domains of the alkanethiol monolayer are observed with sizes typically of 5-25 nm, and multiple molecular domains can exist within one Au grain. STM imaging shows that the (4 × 2) superlattice structure is observed as a (3 × 2√3) structure when imaged under noncontact AFM conditions. The 1-nonanethiol molecules reside in the threefold hollow sites of the Au{111} lattice and aligned along its [112] lattice vectors. The self-assembled monolayer (SAM) contains many nonuniformities such as pinholes, domain boundaries, and monatomic depressions which are present in the Au surface prior to SAM adsorption. The detailed observations demonstrate limitations to the application of 1-nonanethiol as a resist in atomic nanolithography experiments to feature sizes of ~20 nm.
Collections Ireland -> University College Cork -> Research Institutes and Centres
Ireland -> University College Cork -> Applied Nanoscience Group - Conference Items
Ireland -> University College Cork -> Tyndall National Institute
Ireland -> University College Cork -> Applied Nanoscience Group
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> College of Science, Engineering and Food Science
Ireland -> University College Cork -> Micro-Nanoelectronics Centre
Ireland -> University College Cork -> Chemistry - Conference Items

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Colm O'Dwyer

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Colm O'Dwyer
University College Cork
Total Publications: 121