Theoretical studies of novel organic systems:
DescriptionIt is well known that carbon nanotubes CNT exhibit remarkable electrical, mechanical and optical properties. In addition, conducting polymers have also been used for molecular sensors, electronic energy generation and storage devices due to their interesting electronic and electrochemical properties.
Blending pre-formed polymers with carbon nanotubes has been demonstrated to be the most straightforward approach to fabricate carbon nanotube composites.
Different surface modification imparts carbon nanotubes with different electronic structures and surface chemistries. Extensive studies reported have shown that the enhanced functions of a composite are largely determined by the interactions between the polymer and the CNTs.
These studies are essential for developing more efficient and green fabrication approaches of high quality composites with enhanced functions. The knowledge learned from these fundamental studies will be used to fabricate highly conductive and stable composites for constructing efficient biofuel cells.
Along the same line, we will also study how the electronic structures of carbon nanotubes influence the development of sensitive and selective molecular detection devices.
Chapter 1 will be a general introduction to carbon nanotubes, their structure, properties, and surface chemistry. Conducting polymers such as polyaniline and their properties will also be introduced. In this chapter electrical and optical approaches for molecule detections based on carbon nanotubes are also elaborated.
The aim of Chapter 2 is to systematically study how the electronic structure and surface chemistry of carbon nanotubes influence the kinetics of ABA polymerization.
After surface modification, their effect on the polymerization process and the formed composites will be studied. Chapter 3 will be focused on a detailed study of the stabilizing effects that carbon nanotubes have in self doped polyaniline composites.
CNTs have been shown to mitigate the environmental degradation effects imposed on conducting polymers. This study is important for developing stable devices such as biofuel cells using conducting polymer composites.
In this work, a new stabilization mechanism against UV irradiation will also be proposed. Slow electron transfer rate is a fundamental problem that exists in biosensors and biological fuel cells. This is usually due to the lack or inefficient direct electron transfer between redox enzymes and the electrode support.
Optimization was performed to realize direct electron transfer between the redox center of glucose oxidase and the electrode surface with a dramatic enhancement in electron transfer rate and glucose oxidation efficiency.
Furthermore, the enzyme will be reconstructed onto the surface of the electrode in different orientations and their electrobiocatalytic oxidation of glucose will be studied.
In Chapter 5, the strong plasmon absorption of single walled carbon nanotubes SWNTs was explored to develop a new sensing platform for metallic ions. Compared to previously reported electronic and NIR fluorescence detection approaches, the new sensing platform can reach the same or better detection sensitivity and detection limits simply by using UV absorption spectroscopy.
The detection sensitivity was studied using modified SWNTs with different electronic structures. The detection selectivity is realized by modifying the surface of SWNTs with molecular ligands with high specificity for metal ions.
Chapter 6 is a preliminary study on how the electronic structures of SWNTs can influence its Raman scattering properties, which in turn influence their sensitivity for the detection of cancer cells and their capability to destroy them using NIR light radiation.conducting polymers such as polyaniline, and at conducting carbon nanotubes as filler in a non-conducting polymer matrix, as well as hybrid systems with combinations of both fillers.
Picture this: your mobile phone is lying on your desk, close to the speaker of your computer system. Conductive Polymeric Binder for Lithium-Ion Battery Anode by Tianxiang Gao A Thesis Presented in Partial Fulfillment of the Requirements for the Degree Master of Science Approved April by the Here the incorporation of a conducting polymer and a .
Considering that conducting polymer composites have emerged as pertinent and beneficial resources for electrochemical capacitive energy storage, this review investigates the relevant topics by presenting the approaches in the design and fabrication of conducting polymer composites as electrode materials for electrochemical capacitive energy.
Chakraborty, Debanond () Configuration interaction (singles) study of geometric and electronic properties of conducting polymers. Masters thesis, Memorial University of Newfoundland.
Twenty years ago, the idea of a conducting polymer was purely a subject of theoretical debate; however, a fortunate coincidence of events in the late s led to the first reports of polymeric materials with semiconductor properties.
Conducting polymers are unusual organic materials featuring high electronic conductivity. Recently it has been observed that some of these polymers change in .