Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Molecular Wires"”.
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Investigating the properties of molecular wires on gold and diamond
… and electron transport properties of various molecular films on different substrates were investigated in this thesis. In Chapter 3, we proved that the two-step strategy of coupling transition metal complexes to pyridine-terminated oligo(phenylene)ethynylene self-assembled monolayer formed …
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Linear Conjugated Molecular Wires: Organic Materials and Single-Molecule Electronics
… and properties of different families of molecule wires are described. These families are made up of collections of linear conjugated oligomers, such as oligoenes and phenylenevinylenes and their derivatives. The bulk properties of each system were examined in order to establish …
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Enhancing the Third-Order Nonlinear Optical Properties of Porphyrins and Molecular Wires
… of the oligomers were investigated. The molecular second hyperpolarizability, γ, followed the power law γσ n2.12±0.05 (n is number of repeat units) for unusually large molecular lengths. The exceptional exciton delocalization length exceeds 360 conjugated bonds (>49 nm) and is attributed …
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The fabrication and characterization of surface-functionalized microstructures : monolayers as precursors to molecular wires
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1993.
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Computers for chemistry and chemistry for computers: From computational prediction of reaction selectivities to novel molecular wires for electrical devices
… and the electrical properties of novel, single molecular wires. These single molecule technologies described in part II are likely to contribute to more powerful computer chips in the future, which will in turn lead to faster and more accurate computational predictions for chemical problems. …
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Quantum Theory of Electron Transport Through Photo-Synthetic Porphyrins
… thermoelectric properties of various families of molecular junction of metalloporphryins Two main techniques will be included in the theoretical approach; Density Functional Theory, which is implemented in the SIESTA code, and the Green’s function formalism of electron transport (Chapter 2), which …
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Measurement and Visualization of Electron Transfer at the Single Molecule Level
Molecular electronics based on bottom-up electronic circuit design is a potential solution to meet the continuous need to miniaturize electronic devices. The development of highly conductive molecular wires, especially for long distance charge transfer, is a major milestone in the molecular …
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Porphyrin Arrays and Perylene Diimide as Molecular Spintronic Components
… physical limit hindered by quantum tunneling, molecular electronics has gained attention to be a promising candidate for the development of molecule-size electronics where the individual designed molecules can be assembled to serve the similar functionality of transitional components. In this …
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Characterisation of electrode microarrays produced photolithographically and with thiol self-assembled monolayers on gold electrodes
… concept for multiple analyses on a single chip. Molecular electronic is a promising technology which would be an alternative. The concept of molecular electronics is the use of single molecules or arrays, or layers of molecules for the fabrication of electronic components such as wires, switches, …
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Exploration of Alkyne-bridged Multi[(Porphinato)metal] Oligomers for Charge Transport Applications and Spin-Spin Exchange Coupling Properties Using Synthetic, Spectroscopic, Potentiometric, and Magnetic Resonance Methods
… approaches its fundamental physical limit, molecular electronics is emerging as a promising candidate for future ultra-dense electronic devices with individual molecules as active device components. The emerging of molecular spintronics, which exploits the spin-dependent charge transport …
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Excited State Dynamics and Energy Transfer Studies of Aromatic Molecules
… of artificial light harvesting devices and molecular wires can be built using conjugated subunits. Electronic coupling between subunits is important for the efficiency of the energy and charge transfer events, which are the critical elements of light harvesting devices. Additionally …
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Quantum transport through conjugated organic molecular junctions
… is the central basis for future nano and molecular scale applications. In this thesis, I shall discuss the theoretical methods needed to describe such junctions and the present three studies of the electronic properties of molecular junction. High electrical conductance molecular nanowires …
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Directed assembly of functional patterns
… in the assembly procedures, with a focus on nanowires: 1) molecular wires (MWs) with oligophenyleneethynylenic (OPE) backbone were produced by organic synthesis methods and used for the interfacial assembly of MWs/NPs hybrid thin films; 2) conducting polymer (CP) polyethylenedioxythiophene …
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Theory and Simulations of Charge Transfer in Engineered Chemical Systems
… density functional theory, quantum mechanics/molecular mechanics, and molecular dynamics, were combined with synthesis, ultrafast spectroscopy and conductance measurements to design and characterize engineered chemical systems for efficient charge and energy transfer.</p><p>Compelling …
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Scanning Tunneling Microscopy and Spectroscopy of Carbon Nanotubes Interfaced With Silicon Surfaces
… carbon nanotubes (SWNTs) are high-aspect-ratio molecular wires that exhibit either metallic or semiconducting behavior depending upon their diameter and chiral angle. SWNTs support high-mobility electrical conduction, are chemically and mechanically robust, and can both emit and detect infrared …
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Surface studies of organic thin films using scanning probe microscopy and nanofabrication
… have been proposed as viable materials for molecular-based information-storage devices, gas sensors, photovoltaic cells, organic light-emitting diodes and molecular wires. The function and efficiency of porphyrins in devices is largely attributable to molecular architecture and how the …
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Quantum theory of electronic and thermal transport through nano-scale and single-molecule devices
… thermal and thermoelectric properties of molecular junctions containing single organic molecules. The exploration and understanding the electronic and phononic characteristics of molecules connected to metallic leads is a vital part of nanoscience if molecular electronics is to have a …
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Dynamical path integral calculations for condensed phase processes
As is well known, the computational effort in quantum mechanics grows exponentially with system size. Thus a typical computation of an interesting many-body problem quickly becomes prohibitive. In this work, we try to circumvent this exponential scaling by treating a few degrees of freedom …
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Quantum Control in Dissipative Systems
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-11T20:37:39Z No. of bitstreams: 1 Dong_Ke.pdf: 1438135 bytes, checksum: de88ac169d3325e5c5a1fa36ff31b681 (MD5)
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Determining The Excited State Properties of Novel Aryleneethynylenes
… as components in OLEDs, PV cells and molecular wires. An introduction to the phenyeneethynylenes and fundamentals of various photophysical properties is presented, along with a brief overview of several synthetic methodologies available for the preparation of arylethynylenes. In Chap- …
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