First cycle
degree courses
Second cycle
degree courses
Single cycle
degree courses
School of Science
MATERIALS SCIENCE
Course unit
SURFACES STRUCTURE AND DYNAMICS
SCO2045510, A.A. 2019/20

Information concerning the students who enrolled in A.Y. 2019/20

Information on the course unit
Degree course Second cycle degree in
MATERIALS SCIENCE
SC1174, Degree course structure A.Y. 2015/16, A.Y. 2019/20
N0
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Degree course track Common track
Number of ECTS credits allocated 6.0
Type of assessment Mark
Course unit English denomination SURFACES STRUCTURE AND DYNAMICS
Department of reference Department of Chemical Sciences
Mandatory attendance No
Language of instruction Italian
Branch PADOVA
Single Course unit The Course unit can be attended under the option Single Course unit attendance
Optional Course unit The Course unit can be chosen as Optional Course unit

Lecturers
Teacher in charge MAURO SAMBI CHIM/03
Other lecturers FRANCESCO SEDONA CHIM/03

ECTS: details
Type Scientific-Disciplinary Sector Credits allocated
Core courses CHIM/03 General and Inorganic Chemistry 6.0

Course unit organization
Period Second semester
Year 1st Year
Teaching method frontal

Type of hours Credits Teaching
hours
Hours of
Individual study
Shifts
Practice 1.0 10 15.0 No turn
Lecture 5.0 40 85.0 No turn

Calendar
Start of activities 02/03/2020
End of activities 12/06/2020
Show course schedule 2019/20 Reg.2015 course timetable

Examination board
Board From To Members of the board
1 a.a. 2018/19 02/03/2015 30/11/2019 SAMBI MAURO (Presidente)
GRANOZZI GAETANO (Membro Effettivo)
SEDONA FRANCESCO (Membro Effettivo)

Syllabus
Prerequisites: Courses of the BS Degree in Materials Science, with particular reference to the contents of Physics 2, Physical Chemistry 2, Inorganic and Solid State Chemistry, Structure of Solids, Solid State Physics.
Target skills and knowledge: The course provides the foundations for a thorough understanding of the role of surfaces in determining the properties of materials and nanostructures, with a particular emphasis on the production of functional aggregates supported on inorganic surfaces. The necessary elements of surface chemistry and surface structure will be introduced and the thermodynamic and kinetic factors that govern atomic and molecular on-surface self-assembly will be reviewed. The main classes of two-dimensional self-assembled supported structures, their methods of preparation and the main techniques for their morphological, structural, electronic and functional characterization will be described. Synchrotron-based techniques for surface characterization will be studied in detail.
Examination methods: Oral exam.
Assessment criteria: Criteria for assessing the oral exam are the skills in exposing a chosen subject, rigorous quantitative demonstrations, the degree of detail in the answers, the ability to establish links between different aspects of a chemical phenomenon.
Course unit contents: Introduction to surface chemistry - the need of UHV. Surface thermodynamics: surface free energy, surface tension. Ideal epitaxial growth modes. Anisotropy of the surface free energy in crystalline solids. Wulff construction. Surface free energy minimisation: relaxation, reconstruction, faceting. Surface termination of binary compounds: surface dipole minimisation and auto-compensation. Vicinal surfaces. Superstructures: Wood and matrix notation. Simple, coincidence and incommensurate superstructures. A deeper look at coincidence structures. Moiré patterns.

Introduction to STM - operating modes (constant height, constant current).Local Work Function measurements, STS. CITS. Nanomanipulation. Ambient and electrochemical STM. AFM. Exercises on theWSXM software and/or on remote STM measurements.

Introduction to surface kinetics - elementary diffusion events. Introduction to mean field nucleation theory. Critical and stable clusters, saturation density, dendrites. Basics of mean field nucleation theory. Dendritic growth at low T. Fractal growth at intermediate T. Compact islands at high T. Size dispersion reduction through Ostwald ripening. Growth on anisotropic substrates. Step decoration on vicinal surfaces. Quantum wires on fcc (110) surfaces. Quantum dots on reconstructions. Quantum dots on dislocation networks. Oxide templating ultrathin films for metal nanocluster growth. 3D semiconductor quantum dots.

Bragg diffraction in 2D. 2D reciprocal lattice. Ewald sphere in 2D. Reciprocal lattice rods. LEED - cinematic theory. From the LEED image to real space periodicity. Matrix conversion. The presence of domains. Examples of superstructures resolved by combining STM and LEED. LEED I-V. RHEED: principles and applications.

Adsorption. Physisorption and chemisorption. Desorption. Introduction to heterogeneous catalysis. Pseudo-homogeneous approach. The Langmuir isotherm. Langmuir isotherm for non-dissociative, dissociative and competitive adsorption. The BET isotherm. A brief survey of Temkin, BLK, Freundlich, Fowler-Guggenheim, Hill-De Boer isotherms.
The Polanyi-Wigner equation for desorption. Temperature programmed desorption. TPD spectra: zeroth, first and second order desorption spectra.

Introduction to organic self-assembly. Deposition methods. Overlayer-substrate and inter-overlayer interactions. A case of strong O-S interactions: C60 on Pt(110). Van der Waals O-S interactions: FePc on Ag (110): structure and reactivity with oxygen. Supramolecular vs covalent networks. Hydrogen-bonded surface supramolecular networks. Nanoporous networks. Metal coordination-based supramolecular networks. On-surface synthesis.

Introduction to synchrotron radiation. Light production: LINAC, booster, storage ring, source parameters. Spectral brilliance. Bending magnet radiation: spectral width and collimation. Radiation from insertion devices: ondulators and wigglers. From the storage ring to experimental end stations - the beamline: monochromators and mirrors.

Introduction to photo- and Auger emission. The binding energy. Singlets and doublets: spin-orbit coupling. Qualitative analysis. Surface sensitivity. Inelastic attenuation length. Quantitative analysis. Differential photoemission cross sections. The Chemical Shift. Angle-resolved XPS.
Applications of synchrotron radiation: high energy, time and spatial resolution. Photoemission spectromicroscopy. Photon energy tunability. Cross sections dependence on photon energy. Use of Cooper minima. Angle- and energy-scanned photoelectron diffraction. Basics of x-ray absorption. Experimental modes: absorption, florescence, secondary electrons. XANES, NEXAFS, EXAFS, with examples. Basics of x-ray circular magnetic dichroism (XMCD)
Planned learning activities and teaching methods: Classroom lectures and exercises, visit to the Elettra synchrotron (Trieste).
Additional notes about suggested reading: Lecture notes, ppt slides, papers and reviews suggested by the lecturer.

http://www.chimica.unipd.it/mauro.sambi/pubblica/didattica.html
Textbooks (and optional supplementary readings)
  • G. Somorjai, Y. Li, Introduction to Surface Chemistry & Catalysis. --: John Wiley & Sons, 2010. Cerca nel catalogo
  • K. Kolasinski, Surface Science. --: John Wiley & Sons, 2012. Cerca nel catalogo