Oxygen-free in situ scanning tunnelling microscopy

Zhang, Jingdong; Ulstrup, Jens

doi:10.1016/j.jelechem.2006.02.011

Cited by 46 publications

(15 citation statements)

References 41 publications

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“…This means that Ar is not adsorbed on the Au(111) surface. 90 Fig . 2B shows representative in situ STM images of a cysteamine monolayer on the Au(111) surface in the absence (left) and presence (right) of Ar.…”

Section: This Journal Is C the Owner Societies 2011mentioning

confidence: 99%

“…Each unit cell contains two white spots, which correspond to two cysteamine molecules. High-resolution images further show 74,90 It is not fully understood why in situ STM resolution is affected by O 2 , but blurring is significant for many oxygen sensitive systems. The environmental control chamber is efficient enough to remove dioxygen from electrolyte solutions.…”

Section: This Journal Is C the Owner Societies 2011mentioning

confidence: 99%

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Electrochemically controlled self-assembled monolayers characterized with molecular and sub-molecular resolution

Zhang

Welinder

Chi

et al. 2011

Phys. Chem. Chem. Phys.

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Self-assembled organization of functional molecules on solid surfaces has developed into a powerful and sophisticated tool for surface chemistry and nanotechnology. A number of reviews on the topic have been available since the mid 1990s. This perspective article aims to focus on recent development in the investigations of electronic structures and assembling dynamics of electrochemically controlled self-assembled monolayers (SAMs) of thiol containing molecules on gold surfaces. A brief introduction is first given and particularly illustrated by a Table summarizing the molecules studied, the surface lattice structures and the experimental operating conditions. This is followed by discussion of two major high-resolution experimental methods, scanning tunnelling microscopy (STM) and single-crystal electrochemistry. In Section 3, we briefly address choice of supporting electrolytes and substrate surfaces, and their effects on the SAM structures. Section 4 constitutes the major body of the article by offering some details of recent studies for the selected cases, including in situ monitoring of assembling dynamics, molecular electronic structures, and the key external factors determining the SAM packing. In Section 5, we give examples of what can be offered by theoretical computations for the detailed understanding of the SAM electronic structures revealed by STM images. A brief summary of the current applications of SAMs in wiring metalloproteins, design and fabrication of sensors, and single-molecule electronics is described in Section 6. In the final two sections (7 and 8), we discuss the current status in understanding of electronic structures and properties of SAMs in electrochemical environments and what could be expected for future perspectives.

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Section: This Journal Is C the Owner Societies 2011mentioning

confidence: 99%

Section: This Journal Is C the Owner Societies 2011mentioning

confidence: 99%

Electrochemically controlled self-assembled monolayers characterized with molecular and sub-molecular resolution

Zhang

Welinder

Chi

et al. 2011

Phys. Chem. Chem. Phys.

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“…Direct molecular imaging, scanning tunneling spectroscopy, and break‐junction techniques can all be exploited for the in situ monitoring of single‐molecule electronic actions. The approach has been attempted for a wide range of proteins or/and enzymes from heme proteins and blue copper proteins to iron–sulfur proteins . In addition, electrochemical AFM has offered the possibility to quantify the physical or conformational changes of enzyme molecules during their enzymatic actions …”

Section: Nano‐/microstructuring For Studying and Handling Single Enzmentioning

confidence: 99%

“…The approach has been attempted for aw ide range of proteins or/and enzymes from heme proteins [43] and blue copperp roteins [44] to iron-sulfur proteins. [45] In addition, electrochemical AFM has offered the possibilityt oq uantify the physical or conformational changes of enzyme molecules during their enzymatic actions. [37] In other electrical detection schemes, the activity or the kinetics of enzymatic reactions, which yield redox-activep rod-ucts, can be monitored by electron exchange (oxidation or reduction) at an appropriate electrode bias voltage.…”

Section: All-electrical/electrochemical Sensingmentioning

confidence: 99%

Handling and Sensing of Single Enzyme Molecules: From Fluorescence Detection towards Nanoscale Electrical Measurements

et al. 2015

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Classical methods to study single enzyme molecules have provided valuable information about the distribution of conformational heterogeneities, reaction mechanisms, and transients in enzymatic reactions when individual molecules instead of an averaging ensemble are studied. Here, we highlight major advances in all-electrical single enzyme studies with a focus on recent micro- and nanofluidic tools, which offer new ways of handling and studying small numbers of molecules or even single enzyme molecules. We particularly emphasize nanofluidic devices, which enable the integration of electrochemical transduction and detection.

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“…Investigations on such electrochemically deposited metals can be accomplished only after a deaeration of the aqueous solution. Deaeration is accomplished in-situ with 5 N argon gas for 45 min prior to all measurements [208] using the magnetic stirrer. This treatment causes a decrease of oxygen within and above the electrolyte.…”

Section: Deaeration Of the Electrolytementioning

confidence: 99%

Spin-polarized scanning tunneling microscopy at the solid/liquid interface

Majer

Schindler

2015

Surface Science

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The spin-polarized scanning tunneling microscopy (sp-STM) is demonstrated between a magnetized STM tip and a magnetic substrate at the solid/liquid interface under electrochemical conditions at room temperature. Thereby, sp-STM at the solid/liquid interface is accomplished using the differential magnetic mode established by Wulfhekel and Kirschner for investigations at the solid/vacuum interface. The implementation of the sp-STM setup into the electrochemical STM is an important part of this thesis. Special attention is paid to the magnetostriction effect of possible magnetic STM tips. As a model system extended Co islands are electrochemically grown on an Au(111) single crystal. An appropriate electrochemical environment is required to ensure metal Co islands on Au(111), since Co deposition occurs at low potentials where hydrogen evolution and dissolved oxygen contributes to electrochemical reactions at the substrate. After sample preparation extended Co islands on Au(111) up to four atomic layers in height are observed with bare Au(111) areas in between, which is an ideal sample surface for sp-STM at the solid/liquid interface showing ferromagnetic and diamagnetic areas. Sp-STM is employed in-situ at the solid/liquid interface to observe not only sample topography but also sample magnetization of the model system Co/Au (111)

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Oxygen-free in situ scanning tunnelling microscopy

Cited by 46 publications

References 41 publications

Electrochemically controlled self-assembled monolayers characterized with molecular and sub-molecular resolution

Electrochemically controlled self-assembled monolayers characterized with molecular and sub-molecular resolution

Handling and Sensing of Single Enzyme Molecules: From Fluorescence Detection towards Nanoscale Electrical Measurements

Spin-polarized scanning tunneling microscopy at the solid/liquid interface

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