Nanostructured materials are fundamental building blocks for a wide range of nanodevices. Template synthesis is used to fabricate a broad range of nanostructured materials, including single component nanowires, multilayer and multisegment nanowires, nanotubes and nanoporous nanowires. Here two examples of nanowires with unique structure and properties are presented. The first example exploits a novel core/shell microstructure in Cu-Ni films to form magnetic nanotubes. The core/shell microstructure is the result of differences in the nucleation and growth rates of Cu and Ni. By exploiting confinement inside a template, we are able to fabricate nickel nanotubes by selective etching of the Cu in core/shell Ni/Cu nanowires. We report on a novel TEM FIB lift-out method for characterization of the composition and microstructure of the core/shell nanowires. The second example exploits surface scattering in nanoporous gold nanowires for chemical sensing. The feature sizes in nanoporous gold are sufficiently small that the resistance is dominated by surface scattering. An in situ dealloying process has developed to monitor and control the porosity of nanoporous gold nanowire devices. Single nanoporous gold nanowires are demonstrated as chemical sensors for the detection of sulfhydryl molecules.
|School:||The Johns Hopkins University|
|School Location:||United States -- Maryland|
|Source:||DAI-B 69/04, Dissertation Abstracts International|
|Subjects:||Chemical engineering, Electromagnetics, Materials science|
|Keywords:||Copper-nickel phase separation, Electrodeposition, Focused ion beams, Gold, Magnetic nanotubes, Nanotubes, Nanowire sensors, Porous gold nanowires|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be