Metal-organic nanowires
type: CreativeWork
description: Metal-organic nanowires exhibit not only the properties of one-dimensional structures including ultra-small scale, large surface-to-volume ratio etc., but also obvious advantages in their tunable properties and label-free sensing ability by optical or electrical readout. Thus, the evaluation of metal-organic materials by the use of transition metal ions and organic ligands including tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) were focused in this thesis. Concerning the synthesis of metal-organic nanowires, microfluidics offers various benefits, e.g. laminar flow, reduced sample/reagent consumption and control of self-assembly of nanostructures. Therefore, microfluidic techniques have been mainly applied to the synthesis and application of nano-/microstructures. In the first part of this thesis, label-free biosensors based on in situ formed and functionalized gold-tetrathiafulvalene (Au-TTF) wires were developed using an integrated microfluidic system. Au-TTF microwires were formed and immobilized inside the microchip. Then, different surface modification protocols were applied to modify Au-TTF wires which were used for sensitive label-free detection of catecholamines and human IgG by Raman spectroscopy. Following, a study of molecular self-organization in individual Au-TTF nano-/microwire by polarized confocal Raman spectroscopy was performed to understand the growth mechanism of Au-TTF. Single nanowires were analysed using non-destructive polarized Raman spectroscopy. Angular polarization Raman measurement of a single TTF crystal and single nanowire showed the periodic variations in typical Raman bands, indicating preferential ordering of molecules in both crystal and Au-TTF wire. Based on the density functional theory (DFT) calculation and simulation of depolarization ratio, the molecular assembly in a single TTF crystal was confirmed. The tilted stacking of TTF units in single Au-TTF nanowire along the long axis was also proved. Afterwards, the f…
abstract: Metal-organic nanowires exhibit not only the properties of one-dimensional structures including ultra-small scale, large surface-to-volume ratio etc., but also obvious advantages in their tunable properties and label-free sensing ability by optical or electrical readout. Thus, the evaluation of metal-organic materials by the use of transition metal ions and organic ligands including tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) were focused in this thesis. Concerning the synthesis of metal-organic nanowires, microfluidics offers various benefits, e.g. laminar flow, reduced sample/reagent consumption and control of self-assembly of nanostructures. Therefore, microfluidic techniques have been mainly applied to the synthesis and application of nano-/microstructures. In the first part of this thesis, label-free biosensors based on in situ formed and functionalized gold-tetrathiafulvalene (Au-TTF) wires were developed using an integrated microfluidic system. Au-TTF microwires were formed and immobilized inside the microchip. Then, different surface modification protocols were applied to modify Au-TTF wires which were used for sensitive label-free detection of catecholamines and human IgG by Raman spectroscopy. Following, a study of molecular self-organization in individual Au-TTF nano-/microwire by polarized confocal Raman spectroscopy was performed to understand the growth mechanism of Au-TTF. Single nanowires were analysed using non-destructive polarized Raman spectroscopy. Angular polarization Raman measurement of a single TTF crystal and single nanowire showed the periodic variations in typical Raman bands, indicating preferential ordering of molecules in both crystal and Au-TTF wire. Based on the density functional theory (DFT) calculation and simulation of depolarization ratio, the molecular assembly in a single TTF crystal was confirmed. The tilted stacking of TTF units in single Au-TTF nanowire along the long axis was also proved. Afterwards, the f…
author: Xing, Yanlong
language: en
license: https://creativecommons.org/licenses/by/4.0/
date published: 2016
date modified: 2026-07-27T21:28:54Z
provider: Technische Universität Berlin
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Technische Universität Berlin

PropertyValue
property ID: DOI
value: 10.14279/depositonce-5576