Atomic resolution images of metal surfaces exposed in oil using a scanning tunneling microscope

1990 ◽  
Vol 68 (5) ◽  
pp. 2528-2529 ◽  
Author(s):  
T. Endo ◽  
H. Yamada ◽  
T. Sumomogi ◽  
K. Kohno ◽  
K. Kuwahara ◽  
...  
Keyword(s):  
Scanning Tunneling Microscope ◽  
Metal Surfaces ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscope

Scanning tunneling microscopy of E. coli RNA polymerase deposited onto an Au substrate by an electrochemical process

1991 ◽  
Vol 49 ◽  
pp. 378-379
Author(s):  
Rebecca W. Keller ◽  
Carlos Bustamante ◽  
David Bear
Keyword(s):  
Scanning Tunneling Microscope ◽  
Biological Sample ◽  
Substrate Surface ◽  
Electrochemical Process ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Tunneling Microscope ◽  
E Coli ◽  
Preparation Techniques

Under ideal conditions, the Scanning Tunneling Microscope (STM) can create atomic resolution images of different kinds of samples. The STM can also be operated in a variety of non-vacuum environments. Because of its potentially high resolution and flexibility of operation, it is now being applied to image biological systems. Several groups have communicated the imaging of double and single stranded DNA.However, reproducibility is still the main problem with most STM results on biological samples. One source of irreproducibility is unreliable sample preparation techniques. Traditional deposition methods used in electron microscopy, such as glow discharge and spreading techniques, do not appear to work with STM. It seems that these techniques do not fix the biological sample strongly enough to the substrate surface. There is now evidence that there are strong forces between the STM tip and the sample and, unless the sample is strongly bound to the surface, it can be swept aside by the tip.

STM of freeze-fracture replicas: Problems and promises

1993 ◽  
Vol 51 ◽  
pp. 68-69
Author(s):  
J. T. Woodward ◽  
J. A. N. Zasadzinski
Keyword(s):  
Scanning Tunneling Microscope ◽  
Organic Materials ◽  
Freeze Fracture ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Molecular Scale ◽  
Organic Surfaces ◽  
Metal Layers ◽  
Conductive Surfaces

The Scanning Tunneling Microscope (STM) offers exciting new ways of imaging surfaces of biological or organic materials with resolution to the sub-molecular scale. Rigid, conductive surfaces can readily be imaged with the STM with atomic resolution. Unfortunately, organic surfaces are neither sufficiently conductive or rigid enough to be examined directly with the STM. At present, nonconductive surfaces can be examined in two ways: 1) Using the AFM, which measures the deflection of a weak spring as it is dragged across the surface, or 2) coating or replicating non-conductive surfaces with metal layers so as to make them conductive, then imaging with the STM. However, we have found that the conventional freeze-fracture technique, while extremely useful for imaging bulk organic materials with STM, must be modified considerably for optimal use in the STM.

scholarly journals A High Rigidity and Precision Scanning Tunneling Microscope with Decoupled XY and Z Scans

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Xu Chen ◽  
Tengfei Guo ◽  
Yubin Hou ◽  
Jing Zhang ◽  
Wenjie Meng ◽  
...  
Keyword(s):  
Scanning Tunneling Microscope ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Electronic Noise ◽  
High Quality ◽  
Tunneling Microscope ◽  
The Core ◽  
High Rigidity ◽  
The Common ◽  
The Impact

A new scan-head structure for the scanning tunneling microscope (STM) is proposed, featuring high scan precision and rigidity. The core structure consists of a piezoelectric tube scanner of quadrant type (for XY scans) coaxially housed in a piezoelectric tube with single inner and outer electrodes (for Z scan). They are fixed at one end (called common end). A hollow tantalum shaft is coaxially housed in the XY-scan tube and they are mutually fixed at both ends. When the XY scanner scans, its free end will bring the shaft to scan and the tip which is coaxially inserted in the shaft at the common end will scan a smaller area if the tip protrudes short enough from the common end. The decoupled XY and Z scans are desired for less image distortion and the mechanically reduced scan range has the superiority of reducing the impact of the background electronic noise on the scanner and enhancing the tip positioning precision. High quality atomic resolution images are also shown.

Ultrahigh vacuum STM studies of the Bi–O surface of Bi2212

1992 ◽  
Vol 7 (5) ◽  
pp. 1060-1062 ◽  
Author(s):  
Kazuto Ikeda ◽  
Kenshi Takamuku ◽  
Koji Yamaguchi ◽  
Rittaporn Itti ◽  
Naoki Koshizuka
Keyword(s):  
Single Crystals ◽  
Scanning Tunneling Microscope ◽  
Ultrahigh Vacuum ◽  
Atomic Resolution ◽  
Scanning Tunneling ◽  
Tunneling Microscope

Observations of the Bi–O surface of superconductive Bi2212 single crystals were carried out using an ultrahigh-vacuum scanning tunneling microscope (UHV-STM). In the atomic resolution images, surface corrugations, which correspond to the superstructure of the Bi–O surface in addition to Bi atom deficiencies, were observed. There were hollow lines along the ridges of the corrugations, which may be due to missing atom rows.

Chemical Restructuring of Metal Surfaces Studied by Scanning Tunneling Microscope (STM)

1997 ◽  
Vol 3 (S2) ◽  
pp. 577-578
Author(s):  
Ken-ichi Tanaka
Keyword(s):  
Scanning Tunneling Microscope ◽  
Metal Surfaces ◽  
Substrate Surface ◽  
Critical Value ◽  
Dissociative Adsorption ◽  
The Other ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Oxygen Coverage ◽  
Nano Size

Metal surfaces undergo structural change by the dissociative adsorption of O2, where the reconstructuring is caused by either of the two distinctive mechanisms depending on the temperature and/or the crystalographic planes, one is the “adsorption induced reconstruction” and the other is the “formation of quasi-compounds and their array over the surface”.The oxygen induced reconstruction of Cu(100) is the former case. When a Cu(100) surface is exposed to O2, oxygen atoms are adsored by making nano-size c(2x2) structure to avoid the convergence of the stress induced by the adsorption. When the oxygen coverage exceeds a critical value of ca 0.3 ML, Cu atoms are missed from the substrate surface to release the stress and the R45 reconstruction is established. In contrast to the Cu(l00) surface, an entirely different process takes place on a Cu( 110) surface exposed to O2, where the (-Cu-O-) string is formed and by a chemical array over the terrace occur.

Design and application of a scanning tunneling microscope for the observation of large machined surfaces

1989 ◽  
Vol 47 ◽  
pp. 26-27
Author(s):  
D.A. Grigg ◽  
T. A. Dow ◽  
P. E. Russell
Keyword(s):  
Scanning Tunneling Microscope ◽  
Metal Surfaces ◽  
Single Point ◽  
Semiconductor Materials ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Large Sample ◽  
Microscopic Studies ◽  
Design And Application ◽  
Conductive Surfaces

The scanning tunneling microscope is an instrument which can be used to image conductive surfaces with angstrom resolution. This makes the STM an ideal instrument for microscopic studies on machined metals and semiconductors. Several papers have been published showing the effectiveness of the scanning tunneling microscope (STM) to image single point diamond turned metal surfaces such as gold and aluminum.A large sample STM has been constructed specifically to handle machined samples as large as 76 mm in diameter (Fig. 1). A tube scanner has been implimented which allows scan lengths of up to 10 μm. The STM has been designed for quick and easy sample/tip exchange.STM studies have been made on single point diamond turned metals and semiconductor materials. Two forms of copper were diamond turned and studied using the large sample STM;

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