Structure and properties of 1,4-benzenedimethanethiol films grown from solution on Au(1 1 1): An XPS and NEXAFS study

Pasquali, Luca; Terzi, Fabio; Zanardi, Chiara; Pigani, Laura; Seeber, Renato; Paolicelli, G; Suturin, S. M.; Mahne, Nicola; Nannarone, Stefano

doi:10.1016/j.susc.2007.01.007

Cited by 32 publications

(72 citation statements)

References 42 publications

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“…The second doublet is at about 163.5 eV S 2 (S 2 p 3/2 ) corresponding to sulfur of the free thiol (SH) groups or S-S bonds [4,5]. The N 1 s XPS spectra of the BPD SAM are displayed in Figure 4c.…”

Section: Resultsmentioning

confidence: 99%

Crossbar nanoarchitectonics of the crosslinked self-assembled monolayer

Hamoudi

2014

Nanoscale Res Lett

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A bottom-up approach was devised to build a crossbar device using the crosslinked SAM of the 5,5′-bis (mercaptomethyl)-2,2′-bipyridine-Ni2+ (BPD- Ni2+) on a gold surface. To avoid metal diffusion through the organic film, the author used (i) nanoscale bottom electrodes to reduce the probability of defects on the bottom electrodes and (ii) molecular crosslinked technology to avoid metal diffusion through the SAMs. The properties of the crosslinked self-assembled monolayer were determined by XPS. I-V characteristics of the device show thermally activated hopping transport. The implementation of this type of architecture will open up new vistas for a new class of devices for transport, storage, and computing.

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Section: Resultsmentioning

confidence: 99%

Crossbar nanoarchitectonics of the crosslinked self-assembled monolayer

Hamoudi

2014

Nanoscale Res Lett

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“…[7][8][9][10][11][12][13][14][15][16][17][18] Indeed, the rst conduction measurements on molecules involved measuring the resistance of a 1,4-benzenedimethanethiol (BDMT) molecule. 19 This was performed using a scanning tunneling microscopy (STM) tip held on a gold nanoparticle deposited on top of a BDMT SAM.…”

Section: Introductionmentioning

confidence: 99%

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

et al. 2014

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A study of the self-assembly of silver atom intercalated 5,5 0 -bis(mercaptomethyl)-2,2 0 -bipyridine (BPD; HS-CH 2 -(C 5 H 3 N) 2 -CH 2 -SH) and 1,4-benzenedimethanethiol (BDMT; HS-CH 2 -(C 6 H 4 )-CH 2 -SH)) dithiol (DT) multilayers on gold is presented. The bilayer of these SAMs can be obtained starting from the exposure of a DT monolayer to a concentrated silver ion solution. After grafting the silver atoms on the sulfur end group, the incubation of the resulting DT-Ag SAM in a DT solution leads to the formation of a DT-Ag-DT bilayer. This process was extended to make a multilayer structure. The corresponding changes in these self-assembled layers on Au are characterized by X-ray photoelectron spectroscopy (XPS), spectroscopic ellipsometry (SE) measurements, and I-V characteristics. Our interpretation of evolution in the absorbed layer are based on changes in intensities of peaks in XPS related to S bound to substrate or Ag and in -SH groups, as well as changes in thickness and absorption features in SE measurements. The latter show the evolution in absorbance wavelength as a function of thickness and indicate a decrease in the HOMO-LUMO gap from about 4.5 eV to 4 eV. The I-V characteristics show a significant bias dependence on the number of the BPD layers and there appears to be a transition from tunneling to a hopping regime when going from the single to the multiple layers.

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“…7,[10][11][12][13][14][15] SAMs based on BDMT grown on noble metals from solution have been studied by different authors in detail, [15][16][17][18][19][20][21] while the growth of SAMs from the vapor phase has been only poorly investigated. The final structure of the resulting SAM is not only determined by the bond geometry of the sulphur head groups with the substrate and with the methylene groups, but also by the interaction between the aromatic rings of adjacent molecules and even by the interaction between the head groups of different molecules.…”

Section: Introductionmentioning

confidence: 99%

Adsorption geometry variation of 1,4-benzenedimethanethiol self-assembled monolayers on Au(111) grown from the vapor phase

Pasquali

Terzi

Seeber

et al. 2008

The Journal of Chemical Physics

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1,4-benzenedimethanethiol was chemisorbed from the vapor phase onto Au(111). The chemisorption geometry, molecular orientation, and bonding properties were studied at different degrees of surface coverage by photoelectron spectroscopy, metastable deexcitation spectroscopy, and near-edge x-ray absorption fine structure spectroscopy at the carbon K edge. Two main chemisorption regimes were identified: at low coverage the molecules adopt a flat configuration, then, as the molecular density of the first layer increases, the reduction of the available chemisorption sites induces the newly bonded molecules to assume a vertical alignment, with only one of the sulphur head groups interacting with the substrate. Experimental results were interpreted on the basis of theoretical calculations that we performed on the free molecule concerning the molecular orbitals' density of states and simulated x-ray absorption.

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Structure and properties of 1,4-benzenedimethanethiol films grown from solution on Au(1 1 1): An XPS and NEXAFS study

Cited by 32 publications

References 42 publications

Crossbar nanoarchitectonics of the crosslinked self-assembled monolayer

Crossbar nanoarchitectonics of the crosslinked self-assembled monolayer

Going beyond the self-assembled monolayer: metal intercalated dithiol multilayers and their conductance

Adsorption geometry variation of 1,4-benzenedimethanethiol self-assembled monolayers on Au(111) grown from the vapor phase

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