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The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire

In order to study the thermoelectric properties of individual nanowires, a thermoelectric nanowire characterization platform (TNCP) has been previously developed and used in our chair. Here, we report on a redesigned platform aiming to optimize performance, mechanical stability and usability. We com...

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Autores principales: Moosavi, S. Hoda, Kojda, Danny, Kockert, Maximilian, Fischer, Saskia F., Kroener, Michael, Woias, Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5923549/
https://www.ncbi.nlm.nih.gov/pubmed/29621147
http://dx.doi.org/10.3390/nano8040219
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author Moosavi, S. Hoda
Kojda, Danny
Kockert, Maximilian
Fischer, Saskia F.
Kroener, Michael
Woias, Peter
author_facet Moosavi, S. Hoda
Kojda, Danny
Kockert, Maximilian
Fischer, Saskia F.
Kroener, Michael
Woias, Peter
author_sort Moosavi, S. Hoda
collection PubMed
description In order to study the thermoelectric properties of individual nanowires, a thermoelectric nanowire characterization platform (TNCP) has been previously developed and used in our chair. Here, we report on a redesigned platform aiming to optimize performance, mechanical stability and usability. We compare both platforms for electrical conductivity and the Seebeck coefficient for an individual Ag nanowire of the previously-used batch and for comparable measurement conditions. By this, the measurement performance of both designs can be investigated. As a result, whereas the electrical conductivity is comparable, the Seebeck coefficient shows a 50% deviation with respect to the previous studies. We discuss the possible effects of the platform design on the thermoelectric measurements. One reason for the deviation of the Seebeck coefficient is the design of the platform leading to temperature gradients along the bond pads. We further analyze the effect of bonding materials Au and Pt, as well as the effect of temperature distributions along the bond pads used for the thermovoltage acquisition. Another major reason for the variation of the measurement results is the non-homogeneous temperature distribution along the thermometer. We conclude that for the measurement of small Seebeck coefficients, an isothermal positioning of voltage-probing bond pads, as well as a constant temperature profile at the measurement zone are essential.
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spelling pubmed-59235492018-05-03 The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire Moosavi, S. Hoda Kojda, Danny Kockert, Maximilian Fischer, Saskia F. Kroener, Michael Woias, Peter Nanomaterials (Basel) Article In order to study the thermoelectric properties of individual nanowires, a thermoelectric nanowire characterization platform (TNCP) has been previously developed and used in our chair. Here, we report on a redesigned platform aiming to optimize performance, mechanical stability and usability. We compare both platforms for electrical conductivity and the Seebeck coefficient for an individual Ag nanowire of the previously-used batch and for comparable measurement conditions. By this, the measurement performance of both designs can be investigated. As a result, whereas the electrical conductivity is comparable, the Seebeck coefficient shows a 50% deviation with respect to the previous studies. We discuss the possible effects of the platform design on the thermoelectric measurements. One reason for the deviation of the Seebeck coefficient is the design of the platform leading to temperature gradients along the bond pads. We further analyze the effect of bonding materials Au and Pt, as well as the effect of temperature distributions along the bond pads used for the thermovoltage acquisition. Another major reason for the variation of the measurement results is the non-homogeneous temperature distribution along the thermometer. We conclude that for the measurement of small Seebeck coefficients, an isothermal positioning of voltage-probing bond pads, as well as a constant temperature profile at the measurement zone are essential. MDPI 2018-04-05 /pmc/articles/PMC5923549/ /pubmed/29621147 http://dx.doi.org/10.3390/nano8040219 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Moosavi, S. Hoda
Kojda, Danny
Kockert, Maximilian
Fischer, Saskia F.
Kroener, Michael
Woias, Peter
The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire
title The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire
title_full The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire
title_fullStr The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire
title_full_unstemmed The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire
title_short The Effect of the MEMS Measurement Platform Design on the Seebeck Coefficient Measurement of a Single Nanowire
title_sort effect of the mems measurement platform design on the seebeck coefficient measurement of a single nanowire
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5923549/
https://www.ncbi.nlm.nih.gov/pubmed/29621147
http://dx.doi.org/10.3390/nano8040219
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