Vladimir Esaulov

Vladimir Esaulov
French National Centre for Scientific Research | CNRS · Institut des Sciences Moléculaires d'Orsay

DSc

About

231
Publications
13,782
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3,009
Citations
Education
September 1975 - July 1981
Université Paris-Sud 11
Field of study
  • Docteur ès Sciences
September 1968 - January 1973
Faculty of Physics, Leningrad State University
Field of study
  • MSc (Diplom) Physico Mathematical Sciences

Publications

Publications (231)
Article
Dithiols present an interesting case of molecules with two reactive terminal -SH groups (HS-R-SH) that allow their use as binders between different metallic entities. They have thus been used in molecular electronics conduction measurements, in “nanogap” electrodes of interest in plasmonics, as building blocks of more complex structures such as met...
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A study of the self-assembly of silver atom intercalated 5,5′-Bis(mercaptomethyl)-2,2′-bipyridine (BPD; HS-CH2-(C5H3N)2- CH2-SH) and 1,4-benzenedimethanethiol (BDMT; HS-CH2-(C6H4)-CH2-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 io...
Article
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Characteristic core level binding energies (CLBEs) are regularly used to infer the modes of molecular adsorption: orientation, organization, and dissociation processes. Here, we focus on a largely debated situation regarding CLBEs in the case of chalcogen atom bearing molecules. For a thiol, this concerns the case when the CLBE of a thiolate sulfur...
Article
In the case of reactive metals, on adsorption of organic chalcogenide molecules like thiols, chalcogenide-C bond scission can occur. Thus, the high reactivity of Pd leads to initial thiol dissociation and formation of a complex PdS interface layer on which thereafter thiol self-assembled monolayers (SAM) can form. In this context we investigate in...
Article
A study of changes in electron transfer processes in the interaction of Li+ with gold nanostructures as a function of their sizes and substrate type are presented. The Au nanoclusters were grown on HOPG and Al2O3 surfaces. In case of Al2O3 and sputtered HOPG surface a wide surface coverage distribution of nanoclusters is formed whereas on pristine...
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A challenging effort is under way to understand the essence of the quantum size effect of two-dimensional materials in order to achieve the ultimate goal of arbitrarily tailoring their properties in the near future. Here we present experimental and theoretical study of resonant neutralization of low-energy alkali-metal ions on clean and graphene-co...
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In the scattering and stopping of heavy ions on a few surface layers in solids, contributions of the electronic and nuclear energy losses can become comparable. In this work we present a study of 0.6 to 5 keV Ar ion scattering on a Cu(100) surface. Energy loss spectra were measured and displayed some changes as the incident ion energy changes. Thus...
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The number of two-dimensional (2D) materials has grown steadily since the discovery of graphene. Each new 2D material demonstrated unusual physical properties offering a large flexibility in their tailoring for high-tech applications. Here, we report on the formation and characterization of an uncharted 2D material: 'Cu2Te alloy monolayer on Cu(111...
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Jellium model of free electron gas and its extended version have been widely used to understand the neutralization of alkali-metal ion on metal surfaces. We report an unexpected deviation from its prediction we observed in the neutralization of Na+ ions scattering from an Al (111) surface. We find that the neutralization probability decreases monot...
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When atomic particles traverse solids they suffer energy losses due to elastic scattering from nuclei and excitation of electron-hole pairs. These are referred to as nuclear and electronic stoppings respectively. In this paper we discuss methods of determining energy losses and “stopping” cross sections in ion transmission through thin films, as we...
Article
Li+ and Na+ ions are scattered from Au(1 1 0) and Au(1 1 1) surfaces in the keV-energy range, respectively. The pronounced Li° and Na° fractions non-monotonically vary with incident energy and exit angle for high work function gold surfaces. In particular, the azimuthal angle dependence of Li° fraction has been observed at low incident energies for...
Article
Results of a study of electronic energy loss of low keV protons interacting with multilayer graphene targets are presented. Proton energy loss shows an unexpectedly high value as compared with measurements in amorphous carbon and carbon nanotubes. Furthermore, we observe a classical linear behavior of the energy loss with the ion velocity but with...
Article
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We present a study of the functionalization of a monocrystalline ZnO surface using aromatic dithiols. The aim is to obtain a sulfur terminated self-assembled monolayer (SAM), which is then used for creation of further molecular superstructures with intercalated metal atoms. These metal-molecule self-assembled structures are characterized by high re...
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We report a systematic study of thiophene derivatives on gold surfaces. These molecules are of interest in molecular electronics, and the characracteristics of the thiophene–electrode interface in devices needs to be understood as it affects electron transport characteristics. Some experiments indicated S-C bond scission in contact with metals resu...
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The nonmonotonic energy dependence of Li0 fraction on high work function surfaces has not been understood so far. To further study this phenomenon, in this work, efficient neutralization of Na+ ions has been reported on various surfaces, instead of Li+ ions. The nonmonotonic energy dependence of Na0 fraction becomes more and more obvious with the i...
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The electronic structure of self-assembled monolayers (SAMs) formed by thiols of different lengths and dithiols molecules bound to Au (111) has been characterized. Inverse photoemission spectroscopy (IPES) and density functional theory (DFT) have been used to describe the molecule/Au-substrate system. All molecular layers display a clear signal in...
Article
A critical review on excited states of negative ions has been given recently by Buckman and Clark (1994), in a major update of the review by Schulz (1973). However, for completeness we include a summary of some known (mainly low lying) excited states. We include a brief discussion and indicate some problematic points with additional references. The...
Article
Self-assembly of dithiol molecules is of interest because these can be used as linkers between metallic or semiconductor entities and thus employed in molecular electronics and plasmonic applications, or for building complex heterostructures. Here we focus on dithiol self-assembly by evaporation in vacuum, a method that could circumvent the dithiol...
Article
Using various surface science techniques, we have studied the properties of 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA) thin films on a Cu(100) surface. STM investigations suggest the high mobility of the NTCDA molecules over the surface, leading to the formation of large and well-ordered islands. In line with LEED results, two typical d...
Article
A study of adsorption of NTCDA (1,4,5,8-naphthalene tetracarboxylic dianhydride) on Ag(111) and Au(111) surfaces is presented. The adsorption kinetics is followed at room temperature from the submonolayer range upto thin film formation using time-of-flight scattering and recoiling spectroscopy in which atomic fragments and incident scattered partic...
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A high resolution synchrotron photoemission study of selenium, selenophene(Seph) and benzeneselenol(BSe) adsorption on a Cu(100) surface was performed, to investigate the film structure, chemical adsorption properties and molecular orientation. Complementary measurements for selenophene adsorption on Au(111) were also performed. The investigation i...
Article
A study of selenium and benzeneselenol (BSe) interaction with a Cu(111) surface was performed, to investigate adsorption characteristics and molecular orientation. We report core level binding energies (CLBE) determined using high resolution X-ray photoelectron spectroscopy (XPS) and near edge adsorption fine structure (NEXAFS) measurements. The Se...
Article
This progress report focuses on recent work on energy losses undergone by keV slow ions through crystals and on solid surfaces. We treat cases where strong corrugations of the electron density along ion trajectories occur and where an averaged electron density along the ion track cannot be assumed. We present experiments which reveal the existence...
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This report examines the assembly of chalcogenide organic molecules on various surfaces, focusing on cases when chemisorption is accompanied by carbon-chalcogen atom-bond scission. In the case of alkane and benzyl chalcogenides, this induces formation of a chalcogenized interface layer. This process can occur during the initial stages of adsorption...
Article
In this work we study systematically the evaporative adsorption in high vacuum conditions, of 1,4 benzenedimethanethiol (BDMT) onto different metal surfaces: Ag(111), Au(110), Cu(100), and Cu(111). The study is carried out by photoemission using synchrotron radiation. In case of Ag(111) and Au(110), at low exposures, a lying down BDMT phase is form...
Article
Results of a high resolution synchrotron photoemission study of sulfur adsorption on Cu(100) and Cu(111) surfaces are reported. Sulfur adsorption was performed by immersion of pristine samples into aqueous Na2S, which provokes strong sulfidation of copper. Annealing leads to partial elimination of S and progressive formation of well ordered surface...
Article
We present results of adsorption experiments of Sn and 1,4-benzenedimethanethiol (BDMT) on Cu(001), which illustrate the capabilities of a new setup specifically designed to perform surface studies by Direct Recoil Spectroscopy (DRS). The system consists of three UHV chambers connected in series with a 1–100 keV ion accelerator. In the main UHV cha...
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Energy loss of keV H+, He+ ions scattering on Au(111) and Au(110) surfaces has been measured at a random orientation of the target. In grazing scattering, the energy loss depends on the trajectory related surface charge density and the stopping power.
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We developed a quantitative approach for the determination of molecular arrangement and electronic structure in anisotropic organic ultrathin films based on the measurement of polarized reflectivity at the carbon K-edge. The reflectivity spectra were fitted to a parameterized model calculation. The method was applied to a self-assembled monolayer o...
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Electron transfer processes play an important role in surface chemistry. This paper presents results of a study of changes in resonant electron transfer processes, as a function of gold cluster sizes, on the example of electron transfer between Li+ ions scattered on Au clusters on highly oriented pyrolytic graphite (HOPG). The gold nanoclusters wer...
Article
We report a study of 1,4-benzenedimethanethiol (BDMT) adsorption on the (111) surface of the noble metals Au, Ag, and Cu performed from the vapor phase by ion scattering. The better known case of BDMT on the Au(111) surface is used for comparison. Ion scattering carried out in the forward direction to detect both scattering and recoiling atoms allo...
Article
Measurements of energy-losses and electron transfer processes in 1-4 keV fluorine ions and atoms scattering on clean and oxygen covered Ag(1 1 0) were studied. We report data for surface channeling conditions for different surface azimuths for the clean and oxygen covered O(2 × 1)-Ag(1 1 0) (2 × 1) reconstructed surface. Adsorption of oxygen result...
Article
We have studied the self-assembly characteristics, the electronic structure, and the thermal stability of thin N,N'-bis(1-ethylpropyl)perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) films grown on Ag (111) by a broad set of surface science analysis techniques. The deposition of single molecules to the formation of very thin films performed at room...
Article
This work focuses on the quantitative application of spectroscopic ellipsometry to the study of optical properties and thickness of self assembled monolayers (SAMs) of phenyl selenide deposited from the liquid phase on gold. STM, XPS and cyclic voltammetry measurements provide additional chemical and morphological characterization of the SAMs. Whil...
Article
Results of a high resolution photoemission and electrochemistry study of Se adsorption on Au(111) and Ag(111) surfaces performed by immersion of pristine samples into an aqeuous solution of Na2Se are presented. Cyclic voltammetry on Au shows formation of selenium adsorbed species and the structures observed in reductive desorption are related to th...
Article
Highly charged argon ions, Ar7+,8+ with kinetic energy of several keV, have been used to irradiate dodecanethiol self assembled monolayers. The irradiated samples were then imaged in situ by scanning tunneling microscopy. Comparisons between un-irradiated and irradiated surfaces showed the appearance of a number of small defects or ‘nanocraters’ in...
Article
Self assembly of butanedithiol (C4DT) monolayers (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 i...
Chapter
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This chapter presents an overview of low energy ion scattering spectroscopy and time of flight scattering and recoiling spectroscopy for the study of the structure and composition of surfaces as well as of fundamental ion surface interaction processes. The emphasis is on basic concepts regarding scattering, energy losses and charge transfer phenome...
Article
We have investigated the self-assembly of didecyldiselenide on gold containing mercury using X-ray photoelectron spectroscopy, cyclic voltammetry and infrared spectroscopy. The analysis of intensity and chemical shift of selected Se, Hg, and Au photoelectron lines on samples with increasing Hg content, show that didecyldiselenide adsorption strongl...
Article
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Li+ ions with energies ranging from 0.3 to 2 keV are scattered from Au(110) and Pd(100) surfaces and from ultrathin Ag film grown on Au(111) in order to study electron transfer phenomena. We find that neutralization occurs quite efficiently and find an anomalous ion energy dependence of the neutral fraction for Au(110) and Pd(100) surfaces previous...
Article
In an effort to develop a flexible ion beam guiding scheme, the guiding capabilities of straight and curved Teflon tubes were tested with 8 keV Ar(8+) ions. The tubes used were about 50 mm long and of 1 mm/2mm inner and outer diameters. One was straight, and the others were bent with different radii of curvature corresponding to bending angles from...
Article
Substitutional self-assembly of thiol and selenol SAMs from a lying-down phase of butanedithiol (C4DT) (SAM) were investigated using thiols, disulfide, and diselenide molecules. The intent was to address the question if formation of a lying-down dithiol phase is an impediment to formation of standing-up dithiol phases as it has been assumed. It is...
Article
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A joint experimental and theoretical study of low-keV H and F ions in grazing scattering on a missing row reconstructed Au(110) surface is presented. We show the influence of surface electronic corrugation and trajectory effects on energy-loss spectra. Measurements of energy losses for grazing angles scattering in surface channeling conditions for...
Article
In this work, we employ highly charged ions to study the sputtering of positive molecular fragments from two different alkanethiol self-assembled monolayers (SAMs) on gold surfaces: undecanethiol and dodecanethiol. The SAMs are bombarded with a pulsed Arq+ beam (3 < q < 12) with kinetic energies ranging from 1 to 15 keV. The desorbed positive molec...
Article
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A joint experimental and theoretical study of energy loss is presented for 1-to-4-keV fluorine negative ions in grazing scattering on a missing-row reconstructed Au(110) surface. Measurements of energy losses for various azimuthal orientations of the crystal have been performed by means of a time-of-flight method with a pulsed beam. The dependence...
Article
We report a study of the self-assembly of 1,4-benzenedimethanethiol monolayers on gold formed in n-hexane solution held at 60 °C for 30 min and in dark conditions. The valence band characteristics, the thickness of the layer, and the orientation of the molecules were analyzed at a synchrotron using high resolution photoelectron spectroscopy and nea...
Article
Substitutional self-assembly of nonanedithiol from a hexanethiol self-assembled monolayer and the effects of use of ethanol and n-hexane as solvents were investigated. It was found that presence of original solvents in the HT SAM allowed easy replacement, while dried SAMs were more resilient to substitution and much longer times are necessary for s...
Article
We present results of a clean vacuum evaporative adsorption method of assembly of the conjugated dithiol molecule 1,4-benzenedimethanethiol on the surfaces of gold and indium phosphide. Measurements of direct recoil spectroscopy with time-of-flight analysis show in both cases formation of a self-assembled monolayer (SAM) with S atoms available at t...
Article
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We present the results of an experimental and theoretical study of surface channelling and energy loss of 4 keV hydrogen and fluorine ions in grazing scattering on a missing row reconstructed Au(110) surface and a Au(111) surface. We performed measurements of energy losses for grazing angle scattering in surface channelling conditions for various a...
Article
A study of the self-assembly of 1,4-benzenedimethanethiol (BDMT; HS-CH(2)-(C(6)H(4))-CH(2)-SH) monolayers on gold is presented. Self-assembled monolayers (SAMs) are characterized by reflection-absorption infrared spectroscopy (RAIRS), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE) measurements. The ensemble of measureme...
Article
A comparative study on the adsorption of buthanedithiol (BDT), hexanedithiol (HDT), and nonanedithiol (NDT) on Au(111) from ethanolic and n-hexane solutions and two different preparation procedures is presented. SAM characterization is based on reflection-absorption infrared spectroscopy, electrochemistry, X-ray photoelectron spectroscopy, and time...
Article
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We report a multi-technique study of the adsorption kinetics and self-assembly characteristics of EP-PTCDI grown on Ag(111) at UHV conditions and room temperature. Changes in the valence band characteristics for the mono and the multilayer film and the stability as a function of the annealing temperature are discussed. The results show that the mol...
Article
Results of a study of energy losses and electron transfer processes for grazing scattering of fluorine atoms and anions scattering along different azimuthal orientations of the TiO2 crystal are presented. We observe strong variations in the overall intensity of scattered particles which are due to channelling effects. The energy losses do not show...
Article
Highly charged ions have been used to study the sputtering of positive molecular fragments from mercaptoundecanoic acid and dodecanethiol self-assembled monolayers on gold surfaces. The samples were bombarded with Ar(q+) (4 <= q <= 10) ions with kinetic energies from 2 to 18 keV. The main fragments detected were H(+), C(n)H(2n)(+), and C(n+1)O(2)H(...
Article
Results of a study of energy losses and electron transfer processes for grazing scattering of fluorine atoms and anions scattering along different azimuthal orientations of the TiO2 crystal are presented. We observe strong variations in the overall intensity of scattered particles which are due to channelling effects. The energy losses do not show...
Article
Full-text available
In this work we studied the growth and desorption of N,N’-bis(1-ethylpropyl)-perylene 3,4,9,10-tetracarboxdiimide (EP-PTCDI) films on Ag(111) under ultra-high-vacuum conditions by AFM, STM experimental techniques and DFT calculations. STM images corresponding to the adsorption process for coverages less than 0.3 ML show that the interaction with th...
Article
Full-text available
In this work we studied the growth of N,N’-bis(1-ethylpropyl)-perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) films on Si(111) 7×7 surfaces under ultra-high-vacuum conditions, from submonolayer coverages up to 20 nm thin films by means of STM and AFM. The STM images were taken with 1V sample bias polarization (empty states) and 50 pA constant tunne...
Article
A study of the self-assembly of nonane-alkanedithiol monolayers on gold in n-hexane and ethanol solvents is presented. Self-assembled monolayers (SAMs) are characterised by reflection-absorption infrared spectroscopy (RAIRS), sum frequency generation (SFG) and spectroscopic ellipsometry (SE) measurements. Data obtained for alkanethiols SAMs are als...
Article
We have studied the self-assembly characteristics, the electronic structure, and the thermal stability of thin N,N′-bis(1-ethylpropyl)perylene-3,4,9,10-tetracarboxdiimide (EP-PTCDI) films grown on Ag (111) by a broad set of surface science analysis techniques. The deposition of single molecules to the formation of very thin films performed at room...
Article
A global modelling of Sum Frequency Generation (SFG) spectra of the self assembly of alkanethiols is presented. All CH modes are modelled together. CH2 modes are assumed local to allow easy calculation of the spectrum as a function of molecular conformation. Ab initio molecular hyperpolarizabilities are used. A phenomenological approach is used to...
Article
We present results of a study of sputtered oxygen atom outgoing trajectory dependence of the electron transfers with oxidized Ag(110) surfaces reconstructed in different (n x 1) added row structures. With a charge state resolved time-of-flight-direct recoil spectroscopy investigation using 4 keV Ar(+) incident ions, we determine relative yields of...
Article
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We present a detailed study of the energy losses of hydrogen ions that are scattered off an Ag (110) single-crystal surface for primary energies between 1 and 4 keV. We performed measurements for grazing angles as a function of crystal azimuthal orientation, which show large differences in energy losses. Experimental results are discussed by means...