UWSpace is currently experiencing technical difficulties resulting from its recent migration to a new version of its software. These technical issues are not affecting the submission and browse features of the site. UWaterloo community members may continue submitting items to UWSpace. We apologize for the inconvenience, and are actively working to resolve these technical issues.
 

Characterization of Langmuir-Blodgett Films by Electron Spin Resonance Spectroscopy

Thumbnail Image

Files

Hou_Nairong.pdf (12.38 MB)

Date

2020-01-15

Authors

Hou, Nairong

Journal Title

Journal ISSN

Volume Title

Publisher

University of Waterloo

Abstract

Langmuir-Blodgett (LB) films built up with amphiphilic molecules have well-known optical, electrical and magnetic properties. For most applications, it is fundamentally important to understand the structure of the films. Electron spin resonance (ESR) spectroscopy has proven to be a powerful tool for measuring sample structure, yet few studies have been performed on monolayer LB films, primarily due to a lack of sufficient sensitivity. In this work, the fabrication and structural characterization of novel spin-labeled LB films is discussed and demonstrated. Mixed 16-DSA/SA monolayer films containing 10^13 - 10^14 free-radical electron spins were created and characterized for the first-time using continuous wave (CW) ESR spectroscopy and atomic force microscopy (AFM). Through simulation and image analysis, an order parameter was extracted suggesting that the sample assumes a multi-domain liquid crystal structure when deposited on a solid substrate.

Description

Keywords

ESR, LB films

LC Keywords

Citation

URI

http://hdl.handle.net/10012/15470

Collections

Theses
Chemistry