Cassinelli, M. ; Müller, S. ; Voss, K.-O. ; Trautmann, C. ; Völklein, F. ; Gooth, J. ; Nielsch, K. ; Toimil-Molares, M. E. (2017)
Influence of surface states and size effects on the Seebeck coefficient and electrical resistance of Bi1−xSbxnanowire arrays.
In: Nanoscale, 9 (9)
doi: 10.1039/C6NR09624G
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The Seebeck coefficient and electrical resistance of Bi1−xSbx nanowire arrays electrodeposited in etched ion-track membranes have been investigated as a function of wire diameter (40–750 nm) and composition (0 ≤ x ≤ 1). The experimental data reveal a non-monotonic dependence between thermopower and wire diameter for three different compositions. Thus, the thermopower values decrease with decreasing wire diameter, exhibiting a minimum around ∼60 nm. This non-monotonic dependence of the Seebeck coefficient is attributed to the interplay of surface and bulk states. On the one hand, the metallic properties of the surface states can contribute to decreasing the thermopower of the nanostructure with increasing surface-to-volume ratio. On the other hand, for wires thinner than ∼60 nm, the relative increase of the thermopower can be tentatively attributed to the presence of quantum-size effects on both surface and bulk states. These measurements contribute to a better understanding of the interplay between bulk and surface states in nanostructures, and indicate that the decrease of Seebeck coefficient with decreasing diameter caused by the presence of surfaces states can possibly be overcome for even thinner nanowires.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Cassinelli, M. ; Müller, S. ; Voss, K.-O. ; Trautmann, C. ; Völklein, F. ; Gooth, J. ; Nielsch, K. ; Toimil-Molares, M. E. |
| Art des Eintrags: | Bibliographie |
| Titel: | Influence of surface states and size effects on the Seebeck coefficient and electrical resistance of Bi1−xSbxnanowire arrays |
| Sprache: | Englisch |
| Publikationsjahr: | 16 Februar 2017 |
| Verlag: | Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nanoscale |
| Jahrgang/Volume einer Zeitschrift: | 9 |
| (Heft-)Nummer: | 9 |
| DOI: | 10.1039/C6NR09624G |
| URL / URN: | https://doi.org/10.1039/C6NR09624G |
| Kurzbeschreibung (Abstract): | The Seebeck coefficient and electrical resistance of Bi1−xSbx nanowire arrays electrodeposited in etched ion-track membranes have been investigated as a function of wire diameter (40–750 nm) and composition (0 ≤ x ≤ 1). The experimental data reveal a non-monotonic dependence between thermopower and wire diameter for three different compositions. Thus, the thermopower values decrease with decreasing wire diameter, exhibiting a minimum around ∼60 nm. This non-monotonic dependence of the Seebeck coefficient is attributed to the interplay of surface and bulk states. On the one hand, the metallic properties of the surface states can contribute to decreasing the thermopower of the nanostructure with increasing surface-to-volume ratio. On the other hand, for wires thinner than ∼60 nm, the relative increase of the thermopower can be tentatively attributed to the presence of quantum-size effects on both surface and bulk states. These measurements contribute to a better understanding of the interplay between bulk and surface states in nanostructures, and indicate that the decrease of Seebeck coefficient with decreasing diameter caused by the presence of surfaces states can possibly be overcome for even thinner nanowires. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Ionenstrahlmodifizierte Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 29 Dez 2017 10:32 |
| Letzte Änderung: | 29 Dez 2017 10:32 |
| PPN: | |
| Sponsoren: | The Deutsche Forschungsgemeinschaft (DFG) is acknowledged for supporting this research within the priority programs SPP 1386 and SPP 1666. |
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