| Texto completo | |
| Autor(es): |
Barreto, Rafael Reis
;
Prior, Iago Aedon Silva
;
Ferreira, Eidsa Brenda da Costa
;
Carreno-Diaz, Vanessa
;
Weiler, Igor Stein
;
Thill, Alisson Steffli
;
Bernardi, Fabiano
;
de Siervo, Abner
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Surface Science; v. 766, p. 8-pg., 2026-03-01. |
| Resumo | |
In this study, we report a surface-confined metal-organic networks (SMON) obtained by post-depositing Fe onto a sub-monolayer of 5,10,15,20-tetra(4-pyridyl)porphyrin on Ag(100) and activating at 350 K. Scanning tunneling microscopy (STM) reveals a rectangular/square lattice built from pyridyl-Fe-pyridyl nodes, coexisting with close-packed TPyP domains. Two reproducible junction motifs emerge at identical lattice positions: high-contrast nodes and lower-contrast nodes, consistent with, respectively, an on-top Fe bridge above and below the pyridyl plane, which is stabilized closer to Ag(100). Raising the activation temperature by heat treatment to 400 K, the island density decreases, and the median island size increases. Increasing the Fe dose at 350 K, the islands grow up to similar to 90 molecules per island before a plateau, indicating a crossover from diffusion-limited to site/supply-limited growth. At 450 K, intramolecular metalation proceeds without long-range coordination, resulting in a metalated, but unlinked, monolayer. These observations establish a temperature and dose window for assembling Fe-TPyP SMON on Ag(100) and highlight how substrate registry and coordination chemistry produce distinct junction heights within an otherwise rigid square metric. We report a new motif that appears at 350 K, characterized by an ordered phase resembling a double-lobed linker node that forms extended domains. (AU) | |
| Processo FAPESP: | 07/54829-5 - Electronic and geometric structure of nano-materials: synchrotron radiation studies. |
| Beneficiário: | Richard Landers |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 22/12929-3 - Síntese na superfície de materiais de baixa dimensão de camada única e propriedades ajustáveis: entendendo sua integridade química, propriedades vibracionais, eletrônicas, e de spin |
| Beneficiário: | Abner de Siervo |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 25/02160-2 - Desvendando os mecanismos de formação de redes organometálicas utilizando microscopia STM e espectroscopia Raman (TERS) |
| Beneficiário: | Rafael dos Reis Barreto |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |
| Processo FAPESP: | 24/07242-4 - Aprimoramento das propriedades de nanopartículas bimetálicas para aplicação em fotossíntese artificial |
| Beneficiário: | Abner de Siervo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |