Book/Report/Master Thesis

FZJ-2017-05092

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In-situ Monitoring and Controlling the Growth of Organic Molecular Monolayers using a Resistive Sensor

Wolf, N. R. (Corresponding author)FZJ*

2017
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/15806

Report No.: Juel-4403

Abstract: The main subject of this work is to describe the design, preparation and understanding of a conductive sensor and to verify its functionality in order to asses different states of the molecular deposition during the preparation of self-assembling organic molecule monolayers by in-situ determining their electronic conductivity. In the first part of this thesis the working principle of the conductive sensor which is based on the different types of conductivity (e.g. ionic, electric, displacement current, defect conductance) and binding capabilities of the molecules were introduced. In the second part the construction steps of a conductive sensor is sketched followed by verification of its functionality demonstrated for two different molecules, (3-Aminopropyl) triethoxysilane(APTES) and (3-Glycidyloxypropyl) triethoxysilane (GLYMO). Both molecules have already been analyzed with a corresponding capacitive sensor and the results of the two sensors are compared. Additionally, the presence of molecules on the substrates is confirmed by ex-situ analysis, e.g. optical microscope, atomic force microscope (AFM), ellipsometry, X-ray photoelectron spectroscopy (XPS) and wetting angle measurements. In the following experimental part, first both molecules, APTES and GLYMO, are analyzed in the liquid state in order to obtain an electronic reference for the interpretation of the data of the conductive sensor. Then the in-situ monitoring of the growth of organic molecular layers is demonstrated using the conductive sensor that was developed in this work. The data obtained for APTES, GLYMO and Cysteamine (CYS) are interpreted in the framework of existing models combining the experimental data, using the knowledge gained from the experiment of the molecules in the liquid state and ex-situ analysis of the grown films. The conclusion of this thesis is that the conductive sensor allows a detailed look into the different steps and states of the molecular deposition and, thus, represents an ideal tool for a controlled molecular layer deposition (MLD) of organic molecules suitable for applications.

Note: Universität zu Köln, Masterarbeit, 2017

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Contributing Institute(s):

1. Bioelektronik (PGI-8)
2. Bioelektronik (ICS-8)

Research Program(s):

1. 523 - Controlling Configuration-Based Phenomena (POF3-523) (POF3-523)

Appears in the scientific report 2017

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