| Texto completo | |
| Autor(es): |
Moraes, Daniel A.
[1]
;
Souza Junior, Joao B.
[1]
;
Ferreira, Fabio F.
[2]
;
Mogili, Naga Vishnu V.
[3]
;
Varanda, Laudemir C.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Quim Sao Carlos, Phys Chem Dept, Colloidal Mat Grp, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Fed ABC, Ctr Ciencias Nat & Humans, BR-09210580 Santo Andre, SP - Brazil
[3] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NANOSCALE; v. 12, n. 25, p. 13316-13329, JUL 7 2020. |
| Citações Web of Science: | 4 |
| Resumo | |
Tadpole-like gold nanowires were obtained by the oleylamine-mediated synthesis presenting an unusual mixture of fcc and hcp phases. Structural analyses were performed to understand their structure and growth using aberration-corrected high-resolution scanning transmission electron microscopy and electron diffraction at the tail region of tadpoles showing that the anisotropic shape occurred due to stacking fault defects. Stacking faults and twin defects are responsible for the hcp phase inferring a defect dependent growth. The stacking fault model used in X-ray diffraction (XRD) refinement resulted in 60% of hcp stacking sequences. Temperature-dependent XRD analyses showed that the faults become unstable around 120 degrees C, and it is completely converted to the fcc phase at 230 degrees C. We attribute the nanowire formation to a stacking fault mechanism of growth that begins in the later stage of nanoparticle growth. The UV-Vis spectrum presented two localized surface plasmon resonance bands at 500 nm and from 800 nm extending to near-infrared, associated with transverse and longitudinal modes, respectively. A surprising ferromagnetic behavior is also observed with a blocking temperature near 300 K. (AU) | |
| Processo FAPESP: | 12/02093-3 - Síntese de nanoestruturas core@shell de Co@Au (superparamagnéticas) e CdSe@ZnS (quantum dots) visando aplicações antineoplásicas |
| Beneficiário: | João Batista Souza Junior |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 13/01284-2 - Nanopartículas teranósticas a base de óxido de ferro superparamagnético para terapia de câncer da pele via hipertermia magnética |
| Beneficiário: | Laudemir Carlos Varanda |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |