title: Morphological, Structural, and Compositional Characterization of Electrodeposited Bi(1-x)Sb(x) Nanowires
creator: Müller, Sven
subject: ddc-530
subject: 530 Physics
description: Bi$_{1-x}$Sb$_x$ nanowires with controlled diameter ($20$ to $200$,nm) and composition over a wide range from $x = 0$ to $0.5$ and $x=1$ were fabricated by electrochemical deposition in etched ion-track templates. These nanowires are interesting for the investigation of the influence of quantum-size effects on the thermoelectric efficiency. The influence of the electrolyte and the deposition potential on the electrochemical deposition of Bi$_{1-x}$Sb$_x$ nanowires in polymer templates made of polycarbonate (PC) and poly(ethylene terephthalate) (PET) was investigated. Composition, crystalline orientation, and crystallite size of the  nanowires were measured using X-ray diffraction and scanning and transmission electron microscopy. It was demonstrated that the composition of the nanowires can be adjusted by the concentrations of bismuth and antimony in the electrolyte and the deposition potential. Nanowires grown in PET exhibited a pronounced surface roughness compared to the nanowires deposited in PC and offer a novel possibility for the structuring of the nanowire surface to increase the thermoelectrical efficiency by enhanced phonon surface scattering. Seebeck coefficient and temperature dependence of the resistance of nanowire arrays were measured in a cryostat for temperatures down to $sim 30$,K. The absolute value of the Seebeck coefficient decreased with decreasing temperature and was lower than the value of the respective bulk material.
date: 2012
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/13466/1/Mueller_Dissertation_Bi1_xSbx_Nanowires.pdf
identifier: DOI:10.11588/heidok.00013466
identifier: urn:nbn:de:bsz:16-opus-134662
identifier:   Müller, Sven  (2012) Morphological, Structural, and Compositional Characterization of Electrodeposited Bi(1-x)Sb(x) Nanowires.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/13466/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng