Scanning Tunneling Microscopy and Spectroscopy of Metal Organic Complexes

Scanning Tunneling Microscopy and Spectroscopy of Metal Organic Complexes
Author: Kezilebieke Shawulienu
Publisher:
Total Pages: 0
Release: 2014
Genre:
ISBN:

In the bottom up approach of today's nanoscience, the supramolecular assembly of metal atoms and molecules on surfaces is leading to functional compounds, relevant to many applications in optoelectronics, magnetism, and catalysis. It has been found that in some cases high magnetic spin states and strong magnetic anisotropy appear as a result of electron transfer between ligands, surface and metal atom. The focus of this thesis lies on the self assembling of 1,2,4,5-Tetracyanobenzene (TCNB) and Fe-TCNB coordination nanostructures on the Au(111) surface. The structural formation is directed by the non covalent interactions. Scanning tunneling spectroscopy (STS) reveal that the TCNB molecules are physisorbed on Au(111) surface. By detail analysis of the dI/dV spectra above the TCNB monolayer on the Au(111) surface, we found that the TCNB molecules on Au(111) shows a negligible charge transfer with Au(111) substrate and a small adsorption energy of 0.5 eV per TCNB molecules. STS measurement provide a HOMO-LUMO gap of 3 eV in agreement with DFT calculations. By controlling the fabrication parameters, surface coordination nanostructures with different chemical composition or molecular packing have been synthesized. The electronic properties have been characterized by the local dI/dV analysis of the metal centers at different steps of a Fe-(TCNB)x (x=4, 2) complexes formation. At low temperature deposition, first form an ordered metastable intermediate. STM data yield the bond angle between the Fe-N-C is 120°. The scanning tunneling spectroscopy reveal that Fe atoms and the TCNB molecules keep their identity while the Fe atoms localize the surface-state electrons similar to what they do on the bare Au(111) surface. This result indicates that the TCNB molecules are virtually in the same electronic state as before the Fe adsorption. The situations are different when the deposition performance at room temperature. When the temperature is changed, to room temperature, the original entities transform into the Fe(TCNB)4 monomer complexes with 180° Fe-N-C bond angles. The STS above the Fe(TCNB)4 complex strongly suggest that the coordination bond had been formed between the Fe atom and the TCNB ligands. DFT calculations support the conclusions and drawn from experimental studies and assist the interpretations of experiment. Further structural complexation is achieved by the synthesis of Fe(TCNB)2 network. The network has a square structure with a regular separation of the magnetic Fe atoms in the network. The electronic information is gathered from the spectroscopic labeling of FePc to identify some of the resonances of the Fe(TCNB)2 network. There are similar features are found in the dI/dV spectra above the Fe atoms and ligand in both system, indicating that the Fe somehow feels a similar environment from the TCNB ligands in the network and in the FePc molecules. Further analysis of this feature have been disused by means of metal-ligand bond formation.

Scanning Tunneling Microscopy and Spectroscopy of Aluminum Based Quasicrystals and Approximants

Scanning Tunneling Microscopy and Spectroscopy of Aluminum Based Quasicrystals and Approximants
Author: Ruben Rafael Mäder
Publisher: Logos Verlag Berlin GmbH
Total Pages: 167
Release: 2010
Genre: Science
ISBN: 3832526757

On the nanometer scale, the local variation of the electronic density of states of aluminum based complex metallic alloys (quasicrystals and approximants) is experimentally investigated by low temperature scanning tunneling spectroscopy. We report on the correlation between the local variations of the electronic density of states and the electrical resistivity. The surface structure is investigated by scanning tunneling microscopy, low energy electron diffraction, and X-ray photoemission diffraction. Experimental results are interpreted on the basis of the respective bulk structure models.

Scanning Probe Microscopy and Spectroscopy

Scanning Probe Microscopy and Spectroscopy
Author: Roland Wiesendanger
Publisher: Cambridge University Press
Total Pages: 664
Release: 1994-09-29
Genre: Science
ISBN: 9780521428477

The investigation and manipulation of matter on the atomic scale have been revolutionised by scanning tunnelling microscopy and related scanning probe techniques. This book is the first to provide a clear and comprehensive introduction to this subject. Beginning with the theoretical background of scanning tunnelling microscopy, the design and instrumentation of practical STM and associated systems are described in detail, as are the applications of these techniques in fields such as condensed matter physics, chemistry, biology, and nanotechnology. Containing 350 illustrations, and over 1200 references, this unique book represents an ideal introduction to the subject for final-year undergraduates in physics or materials science. It will also be invaluable to graduate students and researchers in any branch of science where scanning probe techniques are used.

An Scanning Tunneling Microscopy and Photoelectron Spectroscopy Study of Pattern Formation and Molecule Ordering Under a Variety of Interactions

An Scanning Tunneling Microscopy and Photoelectron Spectroscopy Study of Pattern Formation and Molecule Ordering Under a Variety of Interactions
Author: Yeming Zhu
Publisher:
Total Pages: 105
Release: 2013
Genre: Chemical bonds
ISBN: 9781303712425

Scanning tunneling microscopy (STM) is well known as a powerful instrument in surface science research. In this dissertation, STM, together with density functional theory (DFT), is used to investigate the chemical bonding properties and charge transfer of metal-organic coordination. The contribution to the coordination compounds with similar but different functional ligands having the same molecular backbones is studied. However, the STM image quality is highly related to the properties of the STM tip. How the adsorbed small molecules on the tip that lead to tip rearrangement and finally affects the STM image acquired for a long-range periodic 2-D pattern is investigated in this dissertation. Furthermore, STM is not the only instrument that can help us to understand surface science and catalysis. In this dissertation, photoelectron spectroscopies, such as XPS, PL and Raman are used to analyze the modified band gap shift of CVD grown monolayers of MoS 2 , proving that low-energy argon sputtering may have significant potential for the activation, functionalization, and modification of MoS2 layers

Scanning Tunneling Microscopy I

Scanning Tunneling Microscopy I
Author: Hans-Joachim Güntherodt
Publisher: Springer Science & Business Media
Total Pages: 252
Release: 2012-12-06
Genre: Science
ISBN: 3642973434

Scanning Tunneling Microscopy I provides a unique introduction to a novel and fascinating technique that produces beautiful images of nature on an atomic scale. It is the first of three volumes that together offer a comprehensive treatment of scanning tunneling microscopy, its diverse applications, and its theoretical treatment. In this volume the reader will find a detailed description of the technique itself and of its applications to metals, semiconductors, layered materials, adsorbed molecules and superconductors. In addition to the many representative results reviewed, extensive references to original work will help to make accessible the vast body of knowledge already accumulated in this field.

Scanning Probe Microscopy and Spectroscopy

Scanning Probe Microscopy and Spectroscopy
Author: Dawn Bonnell
Publisher: John Wiley & Sons
Total Pages: 520
Release: 2000-12-05
Genre: Science
ISBN: 047124824X

A practical introduction to basic theory and contemporary applications across a wide range of research disciplines Over the past two decades, scanning probe microscopies and spectroscopies have gained acceptance as indispensable characterization tools for an array of disciplines. This book provides novices and experienced researchers with a highly accessible treatment of basic theory, alongside detailed examples of current applications of both scanning tunneling and force microscopies and spectroscopies. Like its popular predecessor, Scanning Probe Microscopy and Spectroscopy, Second Edition features contributions from distinguished scientists working in a wide range of specialties at university, commercial, and government research labs around the world. Chapters have been edited for clarity, conciseness, and uniformity of presentation to provide professionals with a concise working reference to scanning probe microscopic and spectroscopic principles, techniques, and practices. This Second Edition has been substantially revised and expanded to reflect important advances and new applications. In addition to numerous examples, the Second Edition features expanded coverage of electrostatic and magnetic force microscopies, near-field optical microscopies, and new applications of buried interfaces in nanomechanics, electrochemistry, and biology. Scanning Probe Microscopy and Spectroscopy, Second Edition is an indispensable working resource for surface scientists, microscopists, and spectroscopists in materials science, chemistry, engineering, biochemistry, physics, and the life sciences. It is also an unparalleled reference text for advanced undergraduates and graduate students in those fields.

Atomic Force Microscopy/Scanning Tunneling Microscopy 3

Atomic Force Microscopy/Scanning Tunneling Microscopy 3
Author: Samuel H. Cohen
Publisher: Springer Science & Business Media
Total Pages: 208
Release: 2007-05-08
Genre: Technology & Engineering
ISBN: 0306470950

The Foundation for Advances in Medicine and Science (FAMS), the organizers of SCANNING 98, sponsored its third annual Atomic Force Microscopy/Scanning Tunneling Microscopy Symposium at the Omni Inner Harbor Hotelin Baltimore, Maryland, from May 9 to 12, 1998. This book represents the compilation of papers that were presented at the AFM/STM Symposium as well as a few that were presented at SCANNING 96 and SCANNING 97 meetings that took place in Monterey, California. The purpose of the symposium was to provide an interface between scientists and engineers, representatives of industry, government and academia, all of whom have a common interest in probe microscopies. The meetings offered an ideal forum where ideas could easily be exchanged and where individuals from diverse fields who are on the cutting edge ofprobe microscopy research could communicate with one another. Experts in probe microscopy from around the world representing a wide range of disciplines including physics, biotechnology, nanotechnology, chemistry, material science, etc., were invited to participate. The format of the meeting was structured so as to encourage communication among these individuals. During the first day’s sessions papers were presented on general topics such as application of scanning probe microscopy in materials science; STM and scanning tunneling spectroscopy of organic materials; fractal analysis in AFM; and nanomanipulation. Other papers presented included unexpected ordering of a molecule; synthesis ofpeptides and oligonucleotides; and analysis oflunar soils from Apollo 11.

Introduction to Scanning Tunneling Microscopy Third Edition

Introduction to Scanning Tunneling Microscopy Third Edition
Author: C. Julian Chen
Publisher: Oxford University Press
Total Pages: 523
Release: 2021-03-04
Genre: Technology & Engineering
ISBN: 0192598562

The scanning tunnelling microscope (STM) was invented by Binnig and Rohrer and received a Nobel Prize of Physics in 1986. Together with the atomic force microscope (AFM), it provides non-destructive atomic and subatomic resolution on surfaces. Especially, in recent years, internal details of atomic and molecular wavefunctions are observed and mapped with negligible disturbance. Since the publication of its first edition, this book has been the standard reference book and a graduate-level textbook educating several generations of nano-scientists. In Aug. 1992, the co-inventor of STM, Nobelist Heinrich Rohrer recommended: "The Introduction to Scanning tunnelling Microscopy by C.J. Chen provides a good introduction to the field for newcomers and it also contains valuable material and hints for the experts". For the second edition, a 2017 book review published in the Journal of Applied Crystallography said "Introduction to Scanning tunnelling Microscopy is an excellent book that can serve as a standard introduction for everyone that starts working with scanning probe microscopes, and a useful reference book for those more advanced in the field". The third edition is a thoroughly updated and improved version of the recognized "Bible" of the field. Additions to the third edition include: theory, method, results, and interpretations of the non-destructive observation and mapping of atomic and molecular wavefunctions; elementary theory and new verifications of equivalence of chemical bond interaction and tunnelling; scanning tunnelling spectroscopy of high Tc superconductors; imaging of self-assembled organic molecules on the solid-liquid interfaces. Some key derivations are rewritten using mathematics at an undergraduate level to make it pedagogically sound.

Scanning Tunneling Microscopy and Spectroscopy

Scanning Tunneling Microscopy and Spectroscopy
Author: Dawn Bonnell
Publisher: Wiley
Total Pages: 436
Release: 1993-03-29
Genre: Science
ISBN: 9780471187356

Scanning tunneling microscopy (STM) provides three-dimensional real- space images of surfaces at high spatial resolution. When the surface is flat and clean, even atoms can be imaged. Its extreme usefulness has led it to near instantaneous acceptance as a characterization tool. This book covers fundamental concepts of STM operation, image interpretation, instrumentation, and techniques for various applications. It als contains advanced treatments of theory and spectroscopy. Surface physicists, electrochemists, materials scientists, and other scientists who see a use for STM will find the depth of coverage and accompanying reference lists in this book essential to their work. In addition, those who wish to add the capabilities of probe microscopy to their operations, such as microscopists and quality control engineers, will find the basic information in this book.