scholarly journals Identification of the atomic scale structures of the gold-thiol interfaces of molecular nanowires by inelastic tunneling spectroscopy

2012 ◽  
Vol 136 (1) ◽  
pp. 014703 ◽  
Author(s):  
Firuz Demir ◽  
George Kirczenow
Keyword(s):  
Tunneling Spectroscopy ◽  
Atomic Scale ◽  
Scale Structures ◽  
Inelastic Tunneling

scholarly journals Vibrations of a molecule in an external force field

2018 ◽  
Vol 115 (18) ◽  
pp. 4571-4576 ◽  
Author(s):  
Norio Okabayashi ◽  
Angelo Peronio ◽  
Magnus Paulsson ◽  
Toyoko Arai ◽  
Franz J. Giessibl
Keyword(s):  
Copper Surface ◽  
Tunneling Spectroscopy ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Restoring Force ◽  
External Force Field ◽  
Restoring Forces ◽  
Inelastic Tunneling ◽  
Oscillation Frequencies

The oscillation frequencies of a molecule on a surface are determined by the mass distribution in the molecule and the restoring forces that occur when the molecule bends. The restoring force originates from the atomic-scale interaction within the molecule and with the surface, which plays an essential role in the dynamics and reactivity of the molecule. In 1998, a combination of scanning tunneling microscopy with inelastic tunneling spectroscopy revealed the vibrational frequencies of single molecules adsorbed on a surface. However, the probe tip itself exerts forces on the molecule, changing its oscillation frequencies. Here, we combine atomic force microscopy with inelastic tunneling spectroscopy and measure the influence of the forces exerted by the tip on the lateral vibrational modes of a carbon monoxide molecule on a copper surface. Comparing the experimental data to a mechanical model of the vibrating molecule shows that the bonds within the molecule and with the surface are weakened by the proximity of the tip. This combination of techniques can be applied to analyze complex molecular vibrations and the mechanics of forming and loosening chemical bonds, as well as to study the mechanics of bond breaking in chemical reactions and atomic manipulation.

Inelastic tunneling spectroscopy of magnetic tunnel junctions based on CoFeB∕MgO∕CoFeB with Mg insertion layer

2006 ◽  
Vol 99 (8) ◽  
pp. 08T305 ◽  
Author(s):  
Guo-Xing Miao ◽  
Krishna B. Chetry ◽  
Arunava Gupta ◽  
William H. Butler ◽  
Koji Tsunekawa ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Tunneling Spectroscopy ◽  
Inelastic Tunneling

Direct Nanoscale Patterning by Atomic Manipulation

1995 ◽  
Vol 380 ◽  
Author(s):  
Craig T. Salling
Keyword(s):  
Scanning Tunneling Microscope ◽  
Room Temperature ◽  
Atomic Layer ◽  
Sample Surface ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Nanoscale Patterning ◽  
Direct Patterning ◽  
Scale Structures ◽  
Atomic Manipulation

ABSTRACTThe ability to create atomic-scale structures with the scanning tunneling microscope (STM) plays an important role in the development of a future nanoscale technology. I briefly review the various modes of STM-based fabrication and atomic manipulation. I focus on using a UHV-STM to directly pattern the Si(001) surface by atomic manipulation at room temperature. By carefully adjusting the tip morphology and pulse voltage, a single atomic layer can be removed from the sample surface to define features one atom deep. Segments of individual dimer rows can be removed to create structures with atomically straight edges and with lateral features as small as one dimer wide. Trenches ∼3 nm wide and 2–3 atomic layers deep can be created with less stringent control of patterning parameters. Direct patterning provides a straightforward route to the fabrication of nanoscale test structures under UHV conditions of cleanliness.

Tuning Local Electrical Conductivity via Fine Atomic Scale Structures of Two-Dimensional Interfaces

Nano Letters ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 6030-6036 ◽  
Author(s):  
Shuai Zhang ◽  
Lei Gao ◽  
Aisheng Song ◽  
Xiaohu Zheng ◽  
Quanzhou Yao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Atomic Scale ◽  
Two Dimensional ◽  
Scale Structures

scholarly journals Tuning friction to a superlubric state via in-plane straining

2019 ◽  
Vol 116 (49) ◽  
pp. 24452-24456 ◽  
Author(s):  
Shuai Zhang ◽  
Yuan Hou ◽  
Suzhi Li ◽  
Luqi Liu ◽  
Zhong Zhang ◽  
...  
Keyword(s):  
Atomic Scale ◽  
Atomistic Simulations ◽  
Contact Interface ◽  
Frictional Behavior ◽  
Flexible Materials ◽  
On Demand ◽  
Scale Structures ◽  
Unusual Strain ◽  
Strain Dependent ◽  
Additional Channel

Controlling, and in many cases minimizing, friction is a goal that has long been pursued in history. From the classic Amontons–Coulomb law to the recent nanoscale experiments, the steady-state friction is found to be an inherent property of a sliding interface, which typically cannot be altered on demand. In this work, we show that the friction on a graphene sheet can be tuned reversibly by simple mechanical straining. In particular, by applying a tensile strain (up to 0.60%), we are able to achieve a superlubric state (coefficient of friction nearly 0.001) on a suspended graphene. Our atomistic simulations together with atomically resolved friction images reveal that the in-plane strain effectively modulates the flexibility of graphene. Consequently, the local pinning capability of the contact interface is changed, resulting in the unusual strain-dependent frictional behavior. This work demonstrates that the deformability of atomic-scale structures can provide an additional channel of regulating the friction of contact interfaces involving configurationally flexible materials.

New Insights into the Atomic-Scale Structures and Behavior of Steels

2012 ◽  
Vol 20 (4) ◽  
pp. 44-48 ◽  
Author(s):  
E. A. Marquis ◽  
P.-Pa Choi ◽  
F. Danoix ◽  
K. Kruska ◽  
S. Lozano-Perez ◽  
...  
Keyword(s):  
Cluster Formation ◽  
Atom Probe ◽  
Design Criterion ◽  
Atomic Scale ◽  
Grain Structure ◽  
Microstructural Stability ◽  
Scale Structures ◽  
Boundary Chemistry ◽  
And Behavior ◽  
Controlled Precipitation

Atom probe tomography (APT) has significantly contributed to our understanding and development of structural materials through the detailed analysis of solute behavior, cluster formation, precipitate evolution, and interfacial and grain boundary chemistry. Whether one is concerned with light alloys, Ni-based superalloys, or steels, the design objectives are similar: developing alloys with optimum properties (strength, toughness, ductility, fatigue resistance, creep strength) through controlled precipitation, grain structure, solute state, and combination of phases. Performance in service, through microstructural stability and resistance to degradation, is also a major design criterion for the development of novel materials.

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