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Towards a Copper Metallic Printer based on Solid Electrolytes - Proof of Concept
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Orientador(es)
Resumo(s)
Nowadays the techniques used to fabricate electronic devices have their deposition
resolution limited. The production of an ion source that could allow the deposition of copper
onto substrates with high-resolution, in order to write those pathways, is extremely
important.
The main objective of this MSc thesis was to prove that it is possible to emit copper
ions from a copper tip that is covered with a copper-based solid electrolyte. This goal
encompasses several important and complex tasks like the synthesis of the appropriate
electrolyte, the production of sufficiently sharp copper tips, the transfer of the electrolyte
onto the copper tip, while preserving its original geometry, performing field ion emission
experiments and the detection of deposited copper. The solid electrolyte used in this work
was the Rb4Cu16I7Cl13, which has the highest ionic conductivity reported until today.
During this work, we tried different options in synthesizing the electrolyte and ended
up with an optimized approach to do so. The synthesized materials were characterized
by X-ray Photoelectron Spectroscopy, Powder X-ray Diffraction and Electrochemical
Impedance Spectroscopy, in order for us to confirm that the materials were in the desired
phase. We tried different approaches to deposit the electrolyte onto the tips - the pressing
of the powder electrolyte onto the tips, with and without heating, dipping the tips in an
acetone suspension made with the electrolyte powder and physical vapour deposition, using
an evaporator built for this purpose. None of these methods gave satisfactory results,
but we were able to deposit some electrolyte onto the tip using the acetone suspension
method. Even though the deposition of the electrolyte onto the tips was not as good as
we desired, we still managed to get some ion current from the acetone prepared sample.
Although the current was not very stable, Secondary Ion Mass Spectroscopy analysis of
the graphite substrate showed that we were able to mostly emit copper ions, with a small
contribution of rubidium ions.
Descrição
Palavras-chave
Copper ion solid electrolyte Rb4Cu16I7Cl13 conduction pathway