Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/147109
Title: Formation of Si nanorods and discrete nanophases by axial diffusion of Si from substrate into Au and AuPt nanoalloy nanorods
Authors: Berger, Nele
Laghrissi, Ayoub
Tay, Yee Yan
Sritharan, Thirumany
Fiutowski, Jacek
Rubahn, Horst-Günter
Es-Souni, Mohammed
Keywords: Engineering::Materials
Issue Date: 2019
Source: Berger, N., Laghrissi, A., Tay, Y. Y., Sritharan, T., Fiutowski, J., Rubahn, H. & Es-Souni, M. (2019). Formation of Si nanorods and discrete nanophases by axial diffusion of Si from substrate into Au and AuPt nanoalloy nanorods. Nanomaterials, 10(1). https://dx.doi.org/10.3390/nano10010068
Journal: Nanomaterials 
Abstract: Interdiffusion between Si substrate and nanorod arrays of Au, Pt, and AuPt nanoalloys is investigated at temperatures lower than the AuSi eutectic temperature. When the nanorod is pure Au, Si diffusion from the substrate is very rapid. Au atoms are completely replaced by Si, converting the nanostructure into one of Si nanorod arrays. Au is diffused out to the substrate. The Au nanorod arrays on Si are unstable. When the nanorod is pure Pt, however, no diffusion of Si into the nanorod or any silicide formation is observed. The Pt nanorods are stable on Si substrate. When the nanorods are an alloy of AuPt, interesting interactions occur. Si diffusion into the nanorods is rapid but the diffusing Si readily reacts with Pt forming PtSi while Au diffuses out to the substrate. After annealing, nanophases of Au, Pt, PtSi, and Si may be present within the nanorods. When the Pt content of the alloy is low (12 at%) all Pt atoms are converted to silicide and the extra Si atoms remain in elemental form, particularly near the tip of the nanorods. Hence, the presence of Au accelerates Si diffusion and the ensuing reaction to form PtSi, a phenomenon absents in pure Pt nanorods. When the Au content of the alloy is low, the Si diffusion would cease when all Au atoms have diffused out of the nanorod, thereby arresting the silicide formation resulting in excess Pt in elemental form within the nanorod. This is a technique of making Si nanorods with and without embedded PtSi nanophase consisting of heterojunctions which could have unique properties.
URI: https://hdl.handle.net/10356/147109
ISSN: 2079-4991
DOI: 10.3390/nano10010068
Schools: School of Materials Science and Engineering 
Rights: © 2019 The Author(s). 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/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

Files in This Item:
File Description SizeFormat 
nanomaterials-10-00068.pdf4.2 MBAdobe PDFThumbnail
View/Open

Page view(s)

206
Updated on Mar 27, 2024

Download(s) 50

53
Updated on Mar 27, 2024

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.