/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

The geometric configuration of the atoms in the surface of a solid is correlated with their valence electronic properties and thereby also with their chemical reactivity towards molecules interacting from the gas phase. Several aspects of these interactions are briefly reviewed: The atomic structure of clean single surfaces and their changes by bond formation (chemisorption), the formation of chemisorbed phases with long-range order and associated phase transitions, the dynamics of the gas-surface interaction processes, as well as temporal oscillations in a catalytic reaction coupled to periodic structural transformations of a surface.

Structure and reactivity of solid surfaces

Experiments with catalytic CO oxidation on Pt(110) show that chemical turbulence in this system can be suppressed by application of appropriate global delayed feedbacks. Different spatiotemporal patterns, seen near a transition from turbulence to uniform oscillations, are investigated. Using a method based on the Hilbert transform, spatial distributions of local phase and amplitude in such patterns are reconstructed from the experimental data. The observed phenomena are reproduced in simulations using a theoretical model of the reaction.

Pattern Formation on the Edge of Chaos: CO Oxidation on Pt(110) under Global Delayed Feedback

The kinetics of a catalytic reaction is frequently formulated in terms of simple concepts of the Langmuir type. Apart from limitations arising from the non-uniformity of the catalyst's surface and from the coverage dependence of the rate “constants”, several other complications may come into play. These may arise on the “quantum level” where energy flow between the various degrees of freedom may cause failure of simple transition state theory, as well as on the “continuum level” where formulation of rate equations in terms of coupled non-linear differential equations may give rise to a rich scenario of spatio-temporal self-organization, including kinetic oscillations, chaos, and formation of concentration patterns. Several of these phenomena are illustrated by selected examples.

Gerhard Ertl

Papers

Structure and reactivity of solid surfaces

Pattern Formation on the Edge of Chaos: CO Oxidation on Pt(110) under Global Delayed Feedback

Dynamics and self-organization of catalytic systems

Substrate mediated autoionization of benzene on graphite

Non-equilibrium surface phase transitions during the catalytic oxidation of CO on Pt(100)