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https://knowledgecommons.lakeheadu.ca/handle/2453/638
Title: | Self-assembled thin films of thiocyanate and selenocyanate bithiophenes |
Authors: | Kelly, Kaitlyn T. |
Keywords: | Thiolate thin film;Development of thiocyanate precursors;Surface analysis techniques;Atomic force microscopy (AFM);Scanning electron microscopy and energy dispersive microscopy (SEM/EDX);X-ray photoelectron spectroscopy (XPS);Time-of-flight secondary ion mass spectrometry (ToF-SIMS) |
Issue Date: | 15-Jun-2015 |
Abstract: | Presented herein is the organic synthesis and thin film (TF) assembly of six alkyl-substituted thiocyante and selenocyante bithiophene molecules: NCSe-T2-Hx, NCS-T2-Hx, NCS-Hx-T2-Hx, NCSe- Hx-T2-Hx, NCS-Hx-T2-Hx-SCN and NCSe-Hx-T2-Hx-SeCN. TFs assembled from these thio and selenocyanates were characterized by six different techniques: electrochemical capacitance (Cp) measurements, scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Cp experiments were used to confirm the development of TFs on an amorphous Au surface using ethanol or hexanes as a reaction solvent. A sputtered Au surface was observed by SEM/EDX to be an inappropriate surface for TF assembly. TFs assembled onto epitaxially grown Au were characterized by multiple techniques. Large crystallites were observed on TFs assembled from NCSe-T2-Hx and NCSe-Hx-T2-Hx-SeCN. Chemical maps of these crystallites were obtained through SEM/EDX. The presence of a covalent Au-S or Au-Se bond on the surface was confirmed by XPS signals from the S 2p3/2 and Se 3d5/2/3d3/2 regions respectively. XPS signals of ~ 399 eV in the N 1s region were observed in all assemblies characterized by this technique, indicating the presence of residual gold-bound cyanide (Au(CN)ads) on the surface. ToF-SIMs chemical intensity maps confirmed the presence of expected TF fragments on the surface of all TFs characterized by this technique. ToF-SIMS results suggested that TFs connected to the Au surface through an aromatically bound S or Se atom produced TFs with higher surface coverage. |
URI: | http://knowledgecommons.lakeheadu.ca/handle/2453/638 |
metadata.etd.degree.discipline: | Chemistry |
metadata.etd.degree.name: | M.Sc. |
metadata.etd.degree.level: | Master |
metadata.dc.contributor.advisor: | MacKinnon, Craig |
metadata.dc.contributor.committeemember: | Chen, Aicheng Gottardo, Christine Ylijoki, Kai |
Appears in Collections: | Electronic Theses and Dissertations from 2009 |
Files in This Item:
File | Description | Size | Format | |
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KellyK2015m-1b.pdf | 3.12 MB | Adobe PDF | View/Open |
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