A scanning tunneling microscopy investigation of the phases formed by the sulfur adsorption on Au(100) from an alkaline solution of 1,4-piperazine(bis)-dithiocarbamate of potassium

Martínez, Jorge Hernández; Valenzuela, B José; Milan, Riccardo; Herrera, J.; Farı́as, M.H.; Hernández-Hernández, Miguel A.

doi:10.1016/j.apsusc.2014.09.025

Cited by 6 publications

(16 citation statements)

References 42 publications

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“…These have been successively assigned to reconstructed gold [20], adsorbed S atoms forming S 8 -like species [17], gold sulfide [4], a mix of S 2 and monomeric S in a quasirectangular arrangement [19], and, more recently, to adsorbed S 2 in different configurations to form S 8 -like species [21,22] based on scanning tunneling microscopy (STM), spectroscopic evidence and density functional theory (DFT) calculations. Similar quasi-rectangular polysulfide structures have been observed on the Au(001) surface, and the basic building blocks have been also assigned to S 2 species [23]. However, there are new evidences indicating that the disulfide species are stabilized by gold atoms forming well ordered disulfide-gold complexes [24].…”

Section: Introductionsupporting

confidence: 60%

New aspects of the surface chemistry of sulfur on Au(111): Surface structures formed by gold-sulfur complexes

Carro

Andreasen

Vericat

et al. 2019

Applied Surface Science

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Sulfur adsorption on gold surfaces has been extensively studied because of the key role of sulfur species in heterogeneous catalysis, and, more recently, due to the interest in the synthesis of anisotropic gold nanoparticles with potential applications in medicine that involves sulfide reduction. Here we report new surface structures for sulfur on Au(111) by combining in situ scanning tunneling microscopy in aqueous sodium sulfide solutions and density functional theory calculations. Our results show two related lattices, (3√3 × 3√3) R30°(θ = 0.22) and (√7 × √7) R19.1°(θ = 0.57), that involve AuS 3 complexes as building blocks. Gold-sulfur complexes are formed by the lifting of gold atoms from the substrate surface as revealed by density functional theory calculations. These species, intermediate between adsorbed S in the well-known (√3 × √3)-R30 ○ lattice and adsorbed polysulfides in organized rectangular structures, explain the surface coverage of gold vacancy islands, a fingerprint of S adsorption on Au(111).

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Section: Introductionsupporting

confidence: 60%

New aspects of the surface chemistry of sulfur on Au(111): Surface structures formed by gold-sulfur complexes

Carro

Andreasen

Vericat

et al. 2019

Applied Surface Science

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“…An average drop in height of 0.11 ± 0.02 nm was observed between regions 1 and 2, which was similar to the height between regions 3 and 4. A previous report has explained the formation of sulfur multilayers with a difference in height of 0.07 ± 0.02 nm between adjacent layers, which is lower than the value in our observations. Therefore, we can conclude that the hexamer is an adlayer of sulfur atoms.…”

Section: Resultscontrasting

confidence: 98%

“…Alternately, on the terrace (region 2) appeared another arrangement with a different structure. Our previous STM measurements have depicted this arrangement as a rectangular structure composed of six atoms, which is denoted as a hexamer . An average drop in height of 0.11 ± 0.02 nm was observed between regions 1 and 2, which was similar to the height between regions 3 and 4.…”

Section: Resultsmentioning

confidence: 59%

“… a DFT, VASP sulfur dimers on the Au(111) surface, ref . b DFT, VASP sulfur dimers on the Au(111) surface, ref . c Experimental values, ref . d Experimental values, current work. e Average values of distances S–Au, S–S, width, and length of the hexamer. Height C represents the drop in height between the structure on the island and dimer C on the terrace, while Height A1B1 describes the difference in height between S A1 and S B1 atoms and the structure on the vacancy. …”

Section: Resultsmentioning

confidence: 99%

“…The reconstruction of the Au(100) surface has been denoted as a quasi-hexagonal (5 × 20) or c (26 × 48) lattice with a 25% more dense arrangement of gold atoms than the (1 × 1) surface. − The lifting of this hex-reconstruction by atoms and molecules leave a strong corrugated pattern on the Au(100) surface. − The transition from the more densely packed hex-reconstruction to a (1 × 1) surface produces different domains on the Au(100) surface. , Three main features can be identified on the (1 × 1) -Au(100) surface: vacancies, terraces, and islands. , …”

Section: Introductionmentioning

confidence: 99%

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From the Terrace Contraction to the Hexameric Sulfur Phase in the Au(100) Surface: A Combined Density Functional Theory and Scanning Tunneling Microscopy Study

et al. 2019

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The lifting of the Au(100) quasi-hexagonal reconstruction by atoms or molecules leaves a rough surface with islands, terraces, and vacancies where different patterns of adsorbates can appear. Although the roughness of the (1 × 1)-Au(100) surface has been well characterized, to our knowledge, there are no theoretical studies considering its effect on the formation of adsorbate patterns, for instance, in the case of sulfur adsorption. In this study, we have combined DFT calculations and STM measurements to explore the structural effects induced on the terrace when the sulfur adsorption takes place on the island and vacancy. Models predict a decrease of the Au–Au bond length in the terrace if the terrace has an appropriate size when the simultaneous adsorption of the sulfur structure occurs on the island and vacancy. According to our predictions, this process of gold bond length contraction on the terrace can affect the formation of the sulfur structure on it. STM images reveal regions where the structure is observed on the island and vacancy, while a different structure, denoted as a hexamer, appears on the terrace. Results from our calculations considering the roughness of the (1 × 1)-Au(100) surface and the gold bond contraction agree well with these experimental observations.

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Study of sulfur adlayers on Au(1 1 1) from basic hydrolysis of piperazine bis(dithiocarbamate) sodium salt

Martínez

Valenzuela

Hernandez-Tamargo

et al. 2015

Applied Surface Science

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A scanning tunneling microscopy investigation of the phases formed by the sulfur adsorption on Au(100) from an alkaline solution of 1,4-piperazine(bis)-dithiocarbamate of potassium

Cited by 6 publications

References 42 publications

New aspects of the surface chemistry of sulfur on Au(111): Surface structures formed by gold-sulfur complexes

New aspects of the surface chemistry of sulfur on Au(111): Surface structures formed by gold-sulfur complexes

From the Terrace Contraction to the Hexameric Sulfur Phase in the Au(100) Surface: A Combined Density Functional Theory and Scanning Tunneling Microscopy Study

Study of sulfur adlayers on Au(1 1 1) from basic hydrolysis of piperazine bis(dithiocarbamate) sodium salt

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