| Texto completo | |
| Autor(es): |
Oliveira, D. S.
[1]
;
Zavarize, M.
[1]
;
Tizei, L. H. G.
[2]
;
Walls, M.
[2]
;
Ospina, C. A.
[3]
;
Iikawa, F.
[1]
;
Ugarte, D.
[1]
;
Cotta, M. A.
[1]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Gleb Wataghin Phys Inst, BR-13083859 Campinas, SP - Brazil
[2] Univ Paris 11, Lab Phys Solides, CNRS, UMR 8502, F-91405 Orsay - France
[3] Brazilian Nanotechnol Natl Lab, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Nanotechnology; v. 28, n. 50 DEC 15 2017. |
| Citações Web of Science: | 2 |
| Resumo | |
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. (AU) | |
| Processo FAPESP: | 16/16365-6 - Nanoestruturas de semicondutoras III-V e suas propriedades ópticas |
| Beneficiário: | Fernando Iikawa |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/02300-1 - Nanofios semicondutores: mecanismos de formação e aplicação em biossensores |
| Beneficiário: | Mônica Alonso Cotta |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 15/16611-4 - Nanofios semicondutores do tipo III-V: estudos de síntese voltados para aplicações em biologia |
| Beneficiário: | Mônica Alonso Cotta |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |