Artículo
Novel mixed self-assembled monolayers of l -cysteine and methanol on gold surfaces under ambient conditions
Franco, Vanina Gisela
; Rodríguez Sotelo, Sindy Julieth
; Calaza, Florencia Carolina
; Passeggi, Mario Cesar Guillermo
; Ruano Sandoval, Gustavo Daniel





Fecha de publicación:
07/2024
Editorial:
Royal Society of Chemistry
Revista:
Nanoscale
ISSN:
2040-3364
e-ISSN:
2040-3372
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this work, we carry out an experimental and theoretical study on the formation ofself-assembled monolayers of L-cysteine molecules on gold surfaces in presence ofmethanol as solvent. We report for the first time, L-cysteine and methanol orderedstructures forming a mixed self-assembled mono-layer on Au(100) surfaces underambient conditions. Finger-like ordered structures were observed using ScanningTunneling Microscopy under room temperature and ambient pressure conditions, theirdimensions range between 0.10-0.20 nm in relative height, 2.0 nm in average width andvariable lengths. By X-ray photoemission spectroscopy, it was determined that Lcysteine molecules bind to the gold surface through the sulfur atom of its thiol-group, intwo molecular configurations: neutral and zwitterionic. We found that the finger-likestructures are the result of complex interactions between L-cysteine molecules with goldsurfaces, L-cysteine molecules with methanol molecules each other and all threecomponents of the system simultaneously (L-cysteine + methanol /gold surfaces). Theseinteractions were detected by Attenuated Total Reflection-Fourier Transformed Infraredspectroscopy. Furthermore, adsorbate/substrate interactions were studied by ab-initiocalculations using the Density Functional Theory, resulting in molecular arrangementsbeing formed by chains of L-cysteine pairs surrounded by physisorbed methanol molecules.
Palabras clave:
L-CYSTEINE
,
METHANOL
,
GOLD
,
SLF-ASSEMBLED
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Colecciones
Articulos(IFIS - LITORAL)
Articulos de INST.DE FISICA DEL LITORAL
Articulos de INST.DE FISICA DEL LITORAL
Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
Franco, Vanina Gisela; Rodríguez Sotelo, Sindy Julieth; Calaza, Florencia Carolina; Passeggi, Mario Cesar Guillermo; Ruano Sandoval, Gustavo Daniel; Novel mixed self-assembled monolayers of l -cysteine and methanol on gold surfaces under ambient conditions; Royal Society of Chemistry; Nanoscale; 16; 32; 7-2024; 15366-15380
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