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Molecules 2014, 19(9), 13010-13026; doi:10.3390/molecules190913010

Nanoscale Lithography Mediated by Surface Self-Assembly of 16-[3,5-Bis(Mercaptomethyl)phenoxy]hexadecanoic Acid on Au(111) Investigated by Scanning Probe Microscopy

1
Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
2
Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5003, USA
*
Author to whom correspondence should be addressed.
Received: 7 May 2014 / Revised: 9 August 2014 / Accepted: 18 August 2014 / Published: 25 August 2014
(This article belongs to the Special Issue Template Directed Synthesis and Self-Assembly in Organic Systems)
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Abstract

The solution-phase self-assembly of bidentate 16-[3,5-bis(mercapto-methyl)phenoxy]hexadecanoic acid (BMPHA) on Au(111) was studied using nano-fabrication protocols with scanning probe nanolithography and immersion particle lithography. Molecularly thin films of BMPHA prepared by surface self-assembly have potential application as spatially selective layers in sensor designs. Either monolayer or bilayer films of BMPHA can be formed under ambient conditions, depending on the parameters of concentration and immersion intervals. Experiments with scanning probe-based lithography (nanoshaving and nanografting) were applied to measure the thickness of BMPHA films. The thickness of a monolayer and bilayer film of BMPHA on Au(111) were measured in situ with atomic force microscopy using n-octadecanethiol as an internal reference. Scanning probe-based nanofabrication provides a way to insert nanopatterns of a reference molecule of known dimensions within a matrix film of unknown thickness to enable a direct comparison of heights and surface morphology. Immersion particle lithography was used to prepare a periodic arrangement of nanoholes within films of BMPHA. The nanoholes could be backfilled by immersion in a SAM solution to produce nanodots of n-octadecanethiol surrounded by a film of BMPHA. Test platforms prepared by immersion particle lithography enables control of the dimensions of surface sites to construct supramolecular assemblies. View Full-Text
Keywords: multidentate thiol; self-assembly; nanofabrication; particle lithography; nanofabrication multidentate thiol; self-assembly; nanofabrication; particle lithography; nanofabrication
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zhai, X.; Lee, H.J.; Tian, T.; Lee, T.R.; Garno, J.C. Nanoscale Lithography Mediated by Surface Self-Assembly of 16-[3,5-Bis(Mercaptomethyl)phenoxy]hexadecanoic Acid on Au(111) Investigated by Scanning Probe Microscopy. Molecules 2014, 19, 13010-13026.

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