Main content

Sub-molecular details in the STM imaging of 4-nitrophenyl thiolate self-assembled monolayers

Show full item record

Title: Sub-molecular details in the STM imaging of 4-nitrophenyl thiolate self-assembled monolayers
Author: Pourmand, Goli
Department: Department of Chemistry
Program: Chemistry
Advisor: Houmam, Abdelaziz
Abstract: Self-assembled monolayers (SAMs) on solid surfaces and in particular aromatic SAMs, attracted considerable attention in recent years due to their unique electrical properties. Low packing density and irreproducibility are common problems associated with aromatic SAMs. In this study, a wide range of modification conditions were used to achieve high coverage SAMs for two common aromatic precursors, 4-nitrothiophenol and bis(4-nitrophenyl) disulfide. Characterization of the SAMs prepared from 4-nitrothiophenol using a number of techniques including scanning tunneling microscopy (STM) demonstrated the formation of highly packed aromatic SAMs along with observation of distinct superstructures on gold that with further analysis revealed the ability of STM to image sub-molecular details of molecules. SAMs prepared from the disulfide lead to a chemically similar monolayer but revealed a much lower coverage with no superstructures. Our results show that these distinct features are most likely induced by SAM stress and the molecules which are involved in making these structures are in a frozen state allowing for the sub molecular details to be observed by STM.  
URI: http://hdl.handle.net/10214/14278
Date: 2018-09-05
Terms of Use: All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.


Files in this item

Files Size Format View
Pourmand_Goli_201809_Msc.pdf 4.457Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record