Using galvanostatic electroforming of Bi1–xSbx nanowires to control composition, crystallinity, and orientation

Limmer, Steven J.; Medlin, Douglas L.; Siegal, Michael P.; Hekmaty, Michelle; Lensch-Falk, Jessica L.; Erickson, Kristopher; Pillars, Jamin; Yelton, W. Graham

doi:10.1557/jmr.2014.354

Using galvanostatic electroforming of Bi_1–xSb_xnanowires to control composition, crystallinity, and orientation

Journal Article · Wed Dec 03 00:00:00 EST 2014 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2014.354· OSTI ID:1146606

Limmer, Steven J. ^[1]; Medlin, Douglas L. ^[2]; Siegal, Michael P. ^[1]; Hekmaty, Michelle ^[2]; Lensch-Falk, Jessica L. ^[2]; Erickson, Kristopher ^[2]; Pillars, Jamin ^[1]; Yelton, W. Graham ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

When using galvanostatic pulse deposition, we studied the factors influencing the quality of electroformed Bi_1–xSb_x nanowires with respect to composition, crystallinity, and preferred orientation for high thermoelectric performance. Two nonaqueous baths with different Sb salts were investigated. The Sb salts used played a major role in both crystalline quality and preferred orientations. Nanowire arrays electroformed using an SbI₃ -based chemistry were polycrystalline with no preferred orientation, whereas arrays electroformed from an SbCl₃-based chemistry were strongly crystallographically textured with the desired trigonal orientation for optimal thermoelectric performance. From the SbCl₃ bath, the electroformed nanowire arrays were optimized to have nanocompositional uniformity, with a nearly constant composition along the nanowire length. Moreover, nanowires harvested from the center of the array had an average composition of Bi_0.75Sb_0.25. However, the nanowire compositions were slightly enriched in Sb in a small region near the edges of the array, with the composition approaching Bi_0.70Sb_0.30.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1146606

Report Number(s):: SAND--2014-4485J; PII: S0884291414003549

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 02 Vol. 30; ISSN 0884-2914

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (1)

Correlating thermoelectric properties with microstructure in Bi _0.8 Sb _0.2 thin films Siegal, M. P.; Lima-Sharma, A. L.; Sharma, P. A. Applied Physics Letters, Vol. 110, Issue 14 https://doi.org/10.1063/1.4979785	journal	April 2017

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