/pdf/self-assembled-monolayers-of-thiolates-on-metals-as-a-form-1neb0hj3k4.pdf

Self-assembled monolayers of thiolates on metals as a form of nanotechnology.

Fundamentals of Plasmonics.- Electromagnetics of Metals.- Surface Plasmon Polaritons at Metal / Insulator Interfaces.- Excitation of Surface Plasmon Polaritons at Planar Interfaces.- Imaging Surface Plasmon Polariton Propagation.- Localized Surface Plasmons.- Electromagnetic Surface Modes at Low Frequencies.- Applications.- Plasmon Waveguides.- Transmission of Radiation Through Apertures and Films.- Enhancement of Emissive Processes and Nonlinearities.- Spectroscopy and Sensing.- Metamaterials and Imaging with Surface Plasmon Polaritons.- Concluding Remarks.

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Plasmonics: Fundamentals and Applications

The surface science of titanium dioxide

Self-assembly is the autonomous organization of components into patterns or structures without human intervention. Self-assembling processes are common throughout nature and technology. They involve components from the molecular (crystals) to the planetary (weather systems) scale and many different kinds of interactions. The concept of self-assembly is used increasingly in many disciplines, with a different flavor and emphasis in each.

http://science.sciencemag.org/content/sci/295/5564/2418.full.pdf

Self-assembly at all scales.

Recent developments have greatly improved the sensitivity of optical sensors based on metal nanoparticle arrays and single nanoparticles. We introduce the localized surface plasmon resonance (LSPR) sensor and describe how its exquisite sensitivity to size, shape and environment can be harnessed to detect molecular binding events and changes in molecular conformation. We then describe recent progress in three areas representing the most significant challenges: pushing sensitivity towards the single-molecule detection limit, combining LSPR with complementary molecular identification techniques such as surface-enhanced Raman spectroscopy, and practical development of sensors and instrumentation for routine use and high-throughput detection. This review highlights several exceptionally promising research directions and discusses how diverse applications of plasmonic nanoparticles can be integrated in the near future.

Biosensing with plasmonic nanosensors

According to modern cosmology, the Universe was born as a burst of energy. The initial temperature of the drop was so high that even atoms could not exist—they have appeared at a later stage, and then various molecules became established too.

Self-assembly Phenomena

Recent years have seen the development of several physical methods for the study of solid surfaces under ultrahigh vacuum conditions, of which the most important are discussed in this progress report. Contemporary views of the chemisorption bond and the factors affecting it are discussed against the background of the adsorption of hydrogen and of carbon monoxide on single crystal surfaces of face-centered cubic transition metals. Catalytic oxidation of CO over palladium and the interaction of oxygen with nickel serve as examples of chemical surface reactions.

Elementary processes at gas-metal interfaces

Who has had the luck to receive the Nobel Prize as a surprise birthday present? The answer is GERHARD ERTL, born in 1936. In his youth he was interested in music, chemistry, and physics, and started university in Stuttgart followed by Paris and Munich. The door to research opened itself in his diploma thesis. His courage showed itself early on when he was a PhD student, and led him to the novel field of surface science and so to heterogeneous catalysis where he became one of the great pioneers. He discovered at an atomic level the mechanisms and kinetics of ammonia synthesis and CO oxidation. He identified the “active centers” of catalysts — and his line of thought shaped current heterogeneous catalysis that is so important for modern industry and society. Time after time he set out basic concepts for solving important scientific and technical problems — with patience and without any fuss. Typical for Gerhard Ertl!

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My Life with Science (extendes English edition)

Dynamics of Molecule/Surface Interactions

Femtosecond-laser excitation induces recombinative desorption of molecular H2 from atomic hydrogen on a ruthenium surface. The measured ultrafast timescale of this surface reaction reveals an excitation process mediated by hot substrate electrons. A coverage dependent isotope effect indicates a collective reaction mechanism whereby vibrationally excited H atoms modify the reactivity of coadsorbed species. Introduction. The dynamics of energy transfer processes at surfaces are of fundamental importance for a microscopic understanding of chemical reaction at solid surfaces, e.g. in heterogeneous catalysis. In conventional chemistry with phonons and electrons always in thermal equilibrium, no detailed information can be obtained on the pathway of the energy flow between the substrate and the adsorbate. However, when a metal substrate is excited by an intense femtosecondlaser pulse, a transient non-equilibrium between the electronic and phononic temperatures is created, which lasts on the order of the electron-phonon coupling time (for ruthenium ~1 ps) and allows to distinguish electron-mediated from phonon-mediated surface reactions [1]. Experiment. The appropriate experimental approach is to measure the two-pulse correlation (2PC) of the respective reaction yield. To this end, the fundamental output of an amplified Ti:sapphire femtosecond-laser system is split in two equally intense portions and both beams are sent time-delayed onto the sample mounted in an ultrahigh vacuum chamber. The yield of the desorbed products is detected with a quadrupole mass spectrometer as a function of the pulse-pulse delay. Results and discussion. Figure 1 shows such a 2PC of the desorption yield for the formation of molecular H2 from atomic hydrogen on an H-saturated Ru(001) surface. The narrow full width at half maximum (FWHM) of ~1.1 ps unambiguously indicates that hot substrate electrons are the driving force behind this recombinative desorption [1,2]. The experimental data are well reproduced by a simulation (solid line) using the two-temperature model (electronic and phononic temperatures Tel and Tph) [3]. Friction between the substrate and the adsorbate [4,5] couples energy from the substrate subsystems to the adsorbate vibrations and hence into the relevant reaction coordinate. The electronic friction model [5] used here to describe the 2PC data for hydrogen yields an ultrafast coupling time for the H2 formation of only a few hundred femtoseconds. C. Frischkorn et el. – page 1

Gerhard Ertl

Papers

Self-assembly Phenomena

Elementary processes at gas-metal interfaces

My Life with Science (extendes English edition)

Dynamics of Molecule/Surface Interactions

Ultrafast dynamics of recombinative desorption of hydrogen from a Ru(001) surface