Author: Yang ZengPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Combining Vibrational Spectroscopy and Scanning Tunneling Microscopy to Learn about Chirality Transfer on Surfaces
Author: Yang ZengVibrational spectroscopy of adsorbates in scanning tunneling microscopy
Author: Mário Alexandre GataPublisher:
ISBN:
Category : Vibrational spectra
Languages : en
Pages : 238
Book Description
Scanning Tunneling Microscopy and Spectroscopy of Functional Molecules on Metal Surfaces
Author: Xin GeVibrational Spectroscopy of Molecules on Surfaces
Author: John T. YatesPublisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 496
Book Description
The observation of the vibrational spectra of adsorbed species provides one of the most incisive methods for und erst an ding chemical and physical phenomena on surfaces. At the present time, many approaches may be applied to studies of molecular vibrations on surfaces. Some of these are used on high-area solids of technological importance (e.g., heterogeneous catalysts) while others are applied to single-crystal substrates to gain better understanding under conditions of controlled surface structure. This book has attempted to bring together in one place a discussion of the major methods used to measure vibrational spectra of surface species. The emphasis is on basic concepts and experimental methods rather than a current survey of the extensive literature in this field. Two introductory chapters describe the basic theoretical aspects of vibrational spectroscopy on surfaces, dealing with normal modes and excitation mechanisms in vibrational spectroscopy. The remaining seven chapters deal with various methods employed to observe surface vibra tions. These are arranged in an order that first treats the use of various methods on surfaces that are not of the single-crystal type. It is in this area that the field first got started in the late 1940s with pioneering work by Terenin and others in the Soviet Union, and by Eisehens and others in the United States in the 1950s. The last four chapters deal with relatively recent methods that permit vibrational studies to be made on single crystal substrates.
Nanoscale Vibrational Spectroscopy of Gold-Cyanide Self-Assemblies: From Monolayers to Crystallites
Author: Kristopher Kent BarrPublisher:
ISBN:
Category :
Languages : en
Pages : 169
Book Description
My thesis work focuses on the integration of scanning tunneling microscopy with infrared spectroscopy, to provide unprecedented -scale resolution in surface imaging with spatially correlated chemical specificity. Scanning probe techniques generally lack chemical information. Inspired by recent advances coupling optical spectroscopies with scanning probe microscopies, I have developed a nanoscale infrared spectroscopic imaging method applying scanning tunneling microscope probe tips as nanoamplifiers to obtain multiplexed molecular vibrational signals utilizing a Fourier transform interferometer at room temperature and ambient pressure. The sensitivity of the tunneling junction and nanoscale probe area enables the measurement of vibrational spectra orders of magnitude below the diffraction limit. I substantiated the effectiveness of this instrument by designing an air- and temperature-stable model system characterized by infrared absorption that couples to the electronic states of the gold substrate. Specifically, aurous cyanide (AuCN) self-assembled monolayers satisfy these requirements with the added benefit that its IR absorption lies outside of the carbon dioxide and water windows, thereby maintaining high signal-to-noise ratios for these experiments. These atomically pristine hexagonal close-packed AuCN monolayers exhibit a strong absorption at 2140 cm 1. Upon thermal annealing, the surface rearranges into a ribbon structure with a blue-shifted absorption to 2230 cm 1. The unique vibrational contrast in AuCN monolayers resulting from thermally induced structural changes serves as an ideal model system for the new infrared scanning tunneling microscope (IR-STM). Upon prolonged vapor deposition, the self-assembled cyanide monolayers reconfigure into large-scale AuCN crystals, giving two distinct morphologies and significantly different vibrational modes, compared to the AuCN monolayer structures. Once again, temperature can tune gold-cyanide orientation and long-range ordering. This work provides new insights for controlled surface-mediated crystal growth in AuCN systems. Ultimately, combining with the chemical information gained from the developed IR-STM, surface-mediated growth will enable new methodologies for fabricating next-generation nanoscale semiconductors. Nanoscale semiconductors based on AuCN that are similar to nanoribbon structures have been demonstrated to be useful for nanoelectronics as well as in catalytic applications.
Handbook of Solid State Chemistry, 6 Volume Set
Author: Richard DronskowskiPublisher: John Wiley & Sons
ISBN: 3527325875
Category : Technology & Engineering
Languages : en
Pages : 3912
Book Description
This most comprehensive and unrivaled compendium in the field provides an up-to-date account of the chemistry of solids, nanoparticles and hybrid materials. Following a valuable introductory chapter reviewing important synthesis techniques, the handbook presents a series of contributions by about 150 international leading experts -- the "Who's Who" of solid state science. Clearly structured, in six volumes it collates the knowledge available on solid state chemistry, starting from the synthesis, and modern methods of structure determination. Understanding and measuring the physical properties of bulk solids and the theoretical basis of modern computational treatments of solids are given ample space, as are such modern trends as nanoparticles, surface properties and heterogeneous catalysis. Emphasis is placed throughout not only on the design and structure of solids but also on practical applications of these novel materials in real chemical situations.
An Scanning Tunneling Microscopy and Photoelectron Spectroscopy Study of Pattern Formation and Molecule Ordering Under a Variety of Interactions
Author: Yeming ZhuPublisher:
ISBN: 9781303712425
Category : Chemical bonds
Languages : en
Pages : 105
Book Description
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 and Spectroscopy of Silicon and Carbon Surfaces
Author: Shenda Mary BakerScanning Probe Microscopy of Functional Materials
Author: Sergei V. KalininPublisher: Springer Science & Business Media
ISBN: 144197167X
Category : Technology & Engineering
Languages : en
Pages : 563
Book Description
The goal of this book is to provide a general overview of the rapidly developing field of novel scanning probe microscopy (SPM) techniques for characterization of a wide range of functional materials, including complex oxides, biopolymers, and semiconductors. Many recent advances in condensed matter physics and materials science, including transport mechanisms in carbon nanostructures and the role of disorder on high temperature superconductivity, would have been impossible without SPM. The unique aspect of SPM is its potential for imaging functional properties of materials as opposed to structural characterization by electron microscopy. Examples include electrical transport and magnetic, optical, and electromechanical properties. By bringing together critical reviews by leading researchers on the application of SPM to to the nanoscale characterization of functional materials properties, this book provides insight into fundamental and technological advances and future trends in key areas of nanoscience and nanotechnology.
Multi-dimensional Vibrational Circular Dichroism
Author: Hisako SatoPublisher: Springer Nature
ISBN: 9819703913
Category :
Languages : en
Pages : 213
Book Description