Self-assembly of butanedithiol (C4DT) mono- layers (SAMs) on gold and substitutional assembly by octanethiols from a lying-down doubly tethered phase of butane dithiol, were investigated in a vacuum evaporation experiment by high-resolution photoemission. The intent was to address the question of transitions from a lying-down to a standing-up phase in dithiol self-assembly and whether a standing-up phase of short chain dithiol can be formed. The lying-down doubly tethered dithiol phase, with both sulfur atoms attached to gold, was formed by evaporation and then exposed to octanethiol molecules. A mixed SAM composed of standing-up octanethiol and dithiol molecules is found to be formed. The degree of dithiol replacement, as evidenced by the increasing thickness of the SAM, is found to augment slowly with increasing exposure to octanethiol. A standing-up C4DT phase was found to be formed upon rapid very large exposure to C4DT vapors. Differences in valence band photoemission between the standing-up and lying-down phases were noted and accounted for theoretically. In all cases, measurements indicate more than one possible adsorption configuration as evidenced by different sulfur binding energies.

Lying-Down to Standing-Up Transitions in Self Assembly of Butanedithiol Monolayers on Gold and Substitutional Assembly by Octanethiols / Juanjuan, Jia; Subhrangsu, Mukherjee; Hicham, Hamoudi; Nannarone, Stefano; Pasquali, Luca; Vladimir A., Esaulov. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - STAMPA. - 117:9(2013), pp. 4625-4631. [10.1021/jp3115786]

Lying-Down to Standing-Up Transitions in Self Assembly of Butanedithiol Monolayers on Gold and Substitutional Assembly by Octanethiols

NANNARONE, Stefano;PASQUALI, Luca;
2013

Abstract

Self-assembly of butanedithiol (C4DT) mono- layers (SAMs) on gold and substitutional assembly by octanethiols from a lying-down doubly tethered phase of butane dithiol, were investigated in a vacuum evaporation experiment by high-resolution photoemission. The intent was to address the question of transitions from a lying-down to a standing-up phase in dithiol self-assembly and whether a standing-up phase of short chain dithiol can be formed. The lying-down doubly tethered dithiol phase, with both sulfur atoms attached to gold, was formed by evaporation and then exposed to octanethiol molecules. A mixed SAM composed of standing-up octanethiol and dithiol molecules is found to be formed. The degree of dithiol replacement, as evidenced by the increasing thickness of the SAM, is found to augment slowly with increasing exposure to octanethiol. A standing-up C4DT phase was found to be formed upon rapid very large exposure to C4DT vapors. Differences in valence band photoemission between the standing-up and lying-down phases were noted and accounted for theoretically. In all cases, measurements indicate more than one possible adsorption configuration as evidenced by different sulfur binding energies.
2013
117
9
4625
4631
Lying-Down to Standing-Up Transitions in Self Assembly of Butanedithiol Monolayers on Gold and Substitutional Assembly by Octanethiols / Juanjuan, Jia; Subhrangsu, Mukherjee; Hicham, Hamoudi; Nannarone, Stefano; Pasquali, Luca; Vladimir A., Esaulov. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - STAMPA. - 117:9(2013), pp. 4625-4631. [10.1021/jp3115786]
Juanjuan, Jia; Subhrangsu, Mukherjee; Hicham, Hamoudi; Nannarone, Stefano; Pasquali, Luca; Vladimir A., Esaulov
File in questo prodotto:
File Dimensione Formato  
JPhysChemC_substitution_2013.pdf

Accesso riservato

Descrizione: Articolo principale
Tipologia: Versione pubblicata dall'editore
Dimensione 1.73 MB
Formato Adobe PDF
1.73 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/936290
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 29
social impact