Scanning tunneling microscopy of locally derivatized self-assembled organic monolayers
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Self-assembled monolayer
Component (thermodynamics)
Scanning Probe Microscopy
Abstract : This project involved the study of a variety of different surfaces and structures in gaseous and liquid environments using the scanning tunneling microscope (STM) and other scanning probe microscopes with the aim of obtaining a better understanding of electrode surfaces and the processes occuring on these surfaces. With the STM we investigated chemical changes on the surface of electrodes, e.g., corrosion, passivation, and biochemical activities, and studied the energetics for electron transfer at the surfaces of semiconductors. We also investigated nanostructures (for example, very small semiconductor particles, porous Si, and self-assembled monolayers) using this technique. Scanning tunneling microscopy (STM), Scanning probe microscopy (SPM), Semiconductor surfaces, Electrode surfaces, Nanostructures
Scanning Probe Microscopy
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Passivation
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Scanning tunneling microscope (STM) has in recent years been one of the most used microscopy approaches in surface science. The STM probe allows for the investigation of atomic resolution electrical properties of a material, these probes are usually of metallic characters. In this project, efforts have been made to investigate how good semi-conducting materials are as scanning probes. GaN-nanowires are used as probes for scanning tunneling microscopy, where a single GaN-nanowire was positioned on top of a tungsten tip, using a nanowire manipulator.
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Scanning gate microscopy
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Scanning Tunneling Microscopy/Spectroscopy In article number 2300413, Shern-Long Lee and co-workers summarize recent scanning tunneling microscopy/spectroscopy (STM/STS) studies of 3D nanoarchitectures based on the supramolecular assembly of functionalized molecules at the liquid-solid interface. The authors highlight several molecular systems with an emphasis on unique characteristics and electronic properties, providing insights into the designs of supramolecular architectures with increasing complexity and desired functionality.
Scanning Probe Microscopy
Force Spectroscopy
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Scanning Probe Microscopy
Scanning Electrochemical Microscopy
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Temporal stability of close-packed thiophene (TP) self-assembled monolayers (SAMs) on Au(111) was investigated by scanning tunneling microscopy (STM). Molecular-scale STM imaging reveals that the structural transitions of TP SAMs in the structure and size of ordered domains and the distribution of vacancy islands (VIs) occurs after long-term storage for 1 year. During this time period, the ordered domain sizes were remarkably increased and the fraction of the areas of the VIs to the total surface area was steeply decreased from 6.5% to 1.7%. We demonstrate that the temporal factor strongly affects two-dimensional SAM structures and our results will be very useful in designing a molecular template for SAM-based further applications.
Self-assembled monolayer
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Self-assembled monolayer
Component (thermodynamics)
Scanning Probe Microscopy
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Scanning Electrochemical Microscopy
Scanning Probe Microscopy
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Using a scanning tunneling microscope (STM), we demonstrated the tip-height-controlled removal of self-assembled monolayers (SAMs) on an Au(111) surface in air. The monolayer films were selectively removed by the mechanical tip contact while scanning. By controlling tunneling current at a constant sample bias voltage, the appropriate tip height was investigated for the removal of different alkanethiol SAMs: octanethiol, decanethiol and dodecanethiol. The tip height for the removal of alkanethiol SAMs was dependent on the film thickness. This result indicated that selective molecular removal of SAMs on the Au(111) surface could be accomplished by controlling the tip height.
Self-assembled monolayer
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Scanning Probe Microscopy
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In the past decade, scanning tunneling microscopy (STM) has revealed new information regarding self-assembled monolayers (SAMs) of organothiols on Au(111) at the molecular level. The periodicity, defects, morphology, and various phases during the self-assembly process have been visualized with unprecedented detail. Using STM under ultrahigh vacuum, new insights regarding SAMs have been revealed from the perspective of potential applications in molecular devices. This article focuses on a molecular-level understanding of the formation of adatom and vacancy islands and reveals how the structure is impacted by introducing aromatic termini. The thermal stability and thermally induced structural evolution of SAMs are monitored in situ. The behavior of alkanethiol molecules under local electric field and tunneling current are studied with molecular resolution. Molecular-level insight regarding negative differential resistance of SAMs is also discussed.
Self-assembled monolayer
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