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Type: Artigo
Title: Different growth regimes in InP nanowire growth mediated by Ag nanoparticles
Author: Oliveira, D. S.
Zavarize, M.
Tizei, L. H. G.
Walls, M.
Ospina, C. A.
Iikawa, F.
Ugarte, D.
Cotta, M. A.
Abstract: We report on the existence of two different regimes in one-step Ag-seeded InP nanowire growth. The vapor-liquid-solid-mechanism is present at larger In precursor flows and temperatures, similar to 500 degrees C, yielding high aspect ratio and pure wurtzite InP nanowires with a semi-spherical metal particle at the thin apex. Periodic diameter oscillations can be achieved under extreme In supersaturations at this temperature range, showing the presence of a liquid catalyst. However, under lower temperatures and In precursor flows, large diameter InP nanowires with mixed wurtzite/zincblende segments are obtained, similarly to In-assisted growth. Chemical composition analysis suggest that In-rich droplet formation is catalyzed at the substrate surface via Ag nanoparticles; this process might be facilitated by the sulfur contamination detected in these nanoparticles. Furthermore, part of the original Ag nanoparticle remains solid and is embedded inside the actual catalyst, providing an in situ method to switch growth mechanisms upon changing In precursor flow. Nevertheless, our Ag-seeded InP nanowires exhibit overall optical emission spectra consistent with the observed structural properties and similar to Au-catalyzed InP nanowires. We thus show that Ag nanoparticles may be a suitable replacement for Au in InP nanowire growth.
Subject: Nanopartículas de prata
Crescimento vapor-líquido-sólido
Silver nanoparticles
Vapor-liquid-solid growth
Country: Reino Unido
Editor: Institute of Physics Publishing
Rights: fechado
Identifier DOI: 10.1088/1361-6528/aa9816
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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