26 documents found

Dissertation

Pattern Collapse - the Mechanical Stability and Solid Bridging of Semiconductor...

Pattern collapse is a damage phenomenon during the production of microelectronic devices. Normally, this issue is attributed to surface tension forces during the drying step of a wet clean process; however, in the past several years other influences have been discussed. For the evaluation, the measurement...
Dissertation

On the Development of Memsensors

Since the postulation of the experimental realization of memristive devices in 2008, a broad variety of concepts for the fabrication of memristive devices has been pursued and the underlying switching mechanisms have been studied in detail. The unique electronic properties of memristive devices inspire...
Dissertation

Controlling surface segregation and tuning silver ion release of reactively...

Reactively sputtered Ag/TiOx nanocomposite coatings show high potential for antibacterial applications. However, previous studies on such coatings showed unavoidable segregation of silver out to the surface, which results in direct exposure of the potentially harmful Ag nanoparticles (NPs) to the environment...
Dissertation

Micro-Structure of Functional Particles and Particle Systems

Nanoparticles and particle systems exhibit exceptional properties in various applications. In the present dissertation the results of the transmission electron microscopy (TEM) analysis in microstructures of nanoparticles and of hybrid nanocomposites with different length scales are presented. The functional...
Dissertation

Untersuchung Chromophore enthaltender Metall/Polymer-Nanokomposite für...

Die vorliegende Dissertation beschäftigt sich mit der Entwicklung geeigneter Schaltermaterialien für elektro-optische Anwendungen auf Basis von Polymermischungen mit Azobenzolderivaten. Durch die Untersuchung der elektrischen Eigenschaften der Komposite...
Dissertation

Maßgeschneiderte biokompatible Silber/Titandioxid-Nanokomposite für antimikrobielle...

In der modernen Medizin geht der Trend immer weiter zu alternativen Möglichkeiten, Infektionen zu behandeln und vorzubeugen, um dabei, soweit es geht, auf Antibiotika zu verzichten. Immer häufiger kommen dabei Silbernanokomposite zum Einsatz. Auf der anderen Seite entstehen durch den vermehrten Gebrauch...
Dissertation

Polymer-Metall-Nanokomposite nahe der Perkolationsschwelle für sensorische...

In dieser Arbeit wurde die Verwendung von Polymer-Metall-Nanokompositen zur Anwendung als Sensoren für organische Dämpfe untersucht. Dabei wurde das Schwellverhalten der Polymersubstrate genutzt, deren Ausdehnung eine Änderung der Abstände und damit der Tunnelwiderstände durch die quasi 2-dimensionale...
Dissertation

Mikrostrukturierungsfreie Herstellungsmethoden für anwendungsnahe Nanokomposite...

Bei der Verwendung von ein- oder zweidimensionalen Füllstoffen ist die Herstellung von Nanokompositen besonders kompliziert, da hier die Orientierung des Füllstoffes einen starken Einfluss auf die Eigenschaften des Komposites haben. Häufig werden für die Herstellung solcher Komposite sehr aufwendige...
Dissertation

Development of high temperature diffusion barriers and a transient liquid-phase...

In order to convert heat up to 600 °C into electrical power, a poly-SiGe semiconductor could be a suitable thermoelectric (TE) material in a µTEG. The interconnection between TE structures can be fabricated using a wafer bonding technique. This technique requires a bond solder, the components of which...
Dissertation

Mechanically stable and environmentally friendly polymer/particle composites...

In this work, novel ecofriendly and durable marine antifouling coatings on the basis of a two-component thermoset polythiourethane (PTU) have been developed. Mechanical and chemical properties with respect to stoichiometric component-variations were evaluated and long-term immersion experiments were...
Dissertation

TEM examination of innovative materials for energy conversion

Within this dissertation, different promising material systems for battery anodes as well as one for cathodes are being examined by methods of transmission electron microscopy (TEM). In Kiel, a high-capacity battery electrode was developed based on a novel silicon microwire structure. As a part of this...
Dissertation

Transmission Electron Microscopy on Memristive Devices

The aim of the research unit Memristive Devices for Neuronal Systems is to develop, manufacture and understand microelectronic devices that can change their electrical resistance repeatedly and reversibly dependent on their history of operation, commonly called memristors. In the framework of this...
Dissertation

Characterization of shape memory alloys via transmission electron microscopy

Shape memory alloys are a unique class of metal alloys that can recover from permanent strain when they are heated above a certain temperature. These alloys also exhibit pseudoelastic properties: they can sustain large deformations at a constant temperature and return to their original undeformed shape...
Dissertation

Morphology controlled synthesis of 1-D-nanomaterials for electrocatalysis...

This dissertation is about morphology controlled synthesis of one dimensional (1D) nanomaterials (NMs) for electrocatalysis and supercapacitance applications. Template assisted electrodeposition technique was employed to grow 1D NMs; the morphology of which could be varied from nanotubes (NTs) to nanorods...
Dissertation

Green synthesis of nanoparticles

There are many definitions for nanotechnology and nanomaterials due to their multidisciplinary nature. The general definition of nanomaterials is that the structures have at least one dimension in the range of 100 nm or smaller. The definition for nanotechnology is that it is a discipline to investigate...
Dissertation

Vapor phase deposition of functional nanocomposite thin films and their...

Nanocomposite thin film coatings with a wide range of metal volume fractions were prepared by co–sputtering of TiO2/Teflon and Ag/Au from two different magnetron sources simultaneously in a home made deposition chamber under high vacuum conditions. Two different types of host materials a polymeric (PTFE)...
Dissertation

Development of horizontal memristive devices and their potential application...

This dissertation deals with the fabrication of horizontal memristive devices and their potential application as memsensors following two different approaches. One originates from the further investigation of well understood iron oxide needle sensors, while the secon approach deals with the development...
Dissertation

Iron-Based, Freestanding Films Fabricated by Magnetron Sputtering for...

In the work structured pure iron, iron-gold and binary FeMn alloys with different Mn contents are successfully fabricated by magnetron sputtering and characterized. For the characterization of the microstructure X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy...
Dissertation

Nanocharacterization of materials for biomagnetic sensing using TEM

The collaborative research center (SFB 855 "Magnetoelectric Composites - Future Biomagnetic Interfaces") aims to develop biomagnetic sensors with the capability of a precise detection of signals in the Femtotesla regime. Novel ME composites are the material of choice and include strain mediated 2-2,...