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4,5‐Bis(diphenylthiophosphinoyl)‐1,2,3‐triazolate interaction with gold nanoparticles and flat surfaces to form self‐assembled monolayers
Author(s) -
CorreaAscencio Marisol,
GalvánMiranda Elizabeth K.,
GarcíaMontalvo Verónica,
Cao Roberto,
CeaOlivares Raymundo,
JiménezSandoval Omar,
VeraEstrada Irma Lucía
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6859
Subject(s) - x ray photoelectron spectroscopy , chemistry , monolayer , colloidal gold , cyclic voltammetry , surface plasmon resonance , nanoparticle , raman spectroscopy , crystallography , analytical chemistry (journal) , electrochemistry , electrode , nanotechnology , materials science , organic chemistry , chemical engineering , biochemistry , physics , engineering , optics
The interaction of the 4,5‐bis(diphenylthiophosphinoyl)‐1,2,3‐triazolate (SPTz − ) with different gold surfaces was investigated (nanoparticles, an electrode, and flat sheets). Studies on binding affinity of this dithiophosphin‐triazolate on a gold electrode were performed by cyclic voltammetry (CV). Voltammograms exhibit two reductive desorption and only one oxidative readsorption, indicating that once reabsorbed, the molecule achieves a unique conformation. The morphology and average size of modified gold nanoparticles were studied by transmission electron microscopy (TEM) (av. diameter of 5.9 ± 1.8 nm). Further characterization was made by UV‐visible (UV‐vis) spectroscopy showing surface plasmon resonance (SPR) at about 580 nm. The bonding configurations of SPTz − on gold have also been investigated by comparing the FT‐IR and FT‐Raman spectra. The 31 P{ 1 H} NMR spectrum of capped nanoparticles exhibited two sharp signals at 30.3 and 29.6 ppm and a very broad signal at 72.7 ppm. X‐ray photoelectron spectroscopy (XPS) showed SPTz − can accomplish a strong interaction with gold nanoparticles through bonds involving a sulfur atom and a nitrogen from the triazole ring with a free terminal PS group, forming self‐assembled monolayers (SAM). This may allow subsequent functionalization through free S/N atoms of the formed SAMs. The SPTz − packing led to a reduction in packing density that permits large spaces between adsorbed headgroups and the inclusion of carbon and oxygen impurities from small molecules; nevertheless, oxidized sulfur or nitrogen species were not detected, indicating the chemical stability of the obtained SAMs.