http://www.cnr.it/ontology/cnr/individuo/prodotto/ID3182

Zinc porphyrin-driven assembly of gold nanofingers (Articolo in rivista)

Type

Label

Zinc porphyrin-driven assembly of gold nanofingers (Articolo in rivista) (literal)

Anno

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Alternative label

Arima, V; Blyth, RLR; Matino, F; Chiodo, L; Della Sala, T; Thompson, J; Regier, T; Del Sole, R; Mele, G; Vasapollo, G; Cingolani, R; Rinaldi, R (2008)
Zinc porphyrin-driven assembly of gold nanofingers
in Small (Weinh., Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Arima, V; Blyth, RLR; Matino, F; Chiodo, L; Della Sala, T; Thompson, J; Regier, T; Del Sole, R; Mele, G; Vasapollo, G; Cingolani, R; Rinaldi, R (literal)

Pagina inizio

Pagina fine

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Rivista

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Note

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\"[Arima, Valentina; Blyth, Robert L. R.; Matino, Francesca; Chiodo, Letizia; Della Sala, Tabio; Thompson, Julie; Cingolani, Roberto; Rinaldi, Ross] Univ Lecce, INFM, CNR, Natl Nanotechnol Lab,Distretto Tecnol ISUFI, I-73100 Lecce, Italy; [Blyth, Robert L. R.; Regier, Tom] Canadian Light Source, Saskatoon, SK S7N 0X4, Canada; [Thompson, Julie] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada; [Del Sole, Roberta; Mele, Giuseppe; Vasapollo, Giuseppe] Univ Lecce, Dipartimento Ingn Innovaz, I-73100 Lecce, Italy (literal)

Titolo

Abstract

Nanofingers of gold covered by porphyrins are prepared by a combination I of atomic manipulation and surface self-organization. A submonolayer of zinc(II) 5,10,15,20-tetrakis(4-tert-butylphenyl)-porphyrin (ZnTBPP) axially ligated to a self-assembled monolayer of 4-aminothiophenol (4-ATP) on Au(111) is prepared and studied using a combination of ultrahigh vacuum techniques. Under the electric field produced by the STM tip, the relatively weakly bound Au surface atoms along the discommensuration lines become mobile due to the strong bond to 4-ATP, while the tendency of the porphyrins towards self-assembly result in a collective motion of gold clusters. The clusters diffuse onto the surface following well-defined pathways along the [11 (2) over bar] direction and then reach the step edges where they assembled, thus forming nanofingers. First-principles density functional theory calculations demonstrate the reduction of the binding energies between the surface gold clusters and the substrate induced by adsorption of thiols. Scanning tunneling microscopy images show assemblies across three adjacent discommensuration lines of the Au (111)-(22 x root 3) reconstruction, which collectively diffuse along these lines to form islands nucleated at step edges. (literal)

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