scholarly journals Atomic‐Scale Observations of the Manganese Porphyrin/Au Catalyst Interface Under the Electrocatalytic Process Revealed with Electrochemical Scanning Tunneling Microscopy (Adv. Mater. Interfaces 23/2021)

2021 ◽  
Vol 8 (23) ◽  
pp. 2170140
Author(s):  
Yongman Kim ◽  
Yongchan Jeong ◽  
YoungJae Kim ◽  
Jeong Young Park
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Manganese Porphyrin ◽  
Au Catalyst ◽  
Tunneling Microscopy ◽  
Electrochemical Scanning Tunneling Microscopy

Scanning tunneling microscopy of polymers: A status report

1989 ◽  
Vol 47 ◽  
pp. 330-331
Author(s):  
P.E. Russell ◽  
I.H. Musselman
Keyword(s):  
High Resolution ◽  
Scanning Tunneling Microscopy ◽  
Sample Surface ◽  
Atomic Scale ◽  
Constant Current ◽  
Scanning Tunneling ◽  
Status Report ◽  
Tunneling Microscopy ◽  
Research Issues ◽  
Wide Range

Scanning tunneling microscopy (STM) has evolved rapidly in the past few years. Major developments have occurred in instrumentation, theory, and in a wide range of applications. In this paper, an overview of the application of STM and related techniques to polymers will be given, followed by a discussion of current research issues and prospects for future developments. The application of STM to polymers can be conveniently divided into the following subject areas: atomic scale imaging of uncoated polymer structures; topographic imaging and metrology of man-made polymer structures; and modification of polymer structures. Since many polymers are poor electrical conductors and hence unsuitable for use as a tunneling electrode, the related atomic force microscopy (AFM) technique which is capable of imaging both conductors and insulators has also been applied to polymers.The STM is well known for its high resolution capabilities in the x, y and z axes (Å in x andy and sub-Å in z). In addition to high resolution capabilities, the STM technique provides true three dimensional information in the constant current mode. In this mode, the STM tip is held at a fixed tunneling current (and a fixed bias voltage) and hence a fixed height above the sample surface while scanning across the sample surface.

Scanning Tunneling Microscopy of Amorphous Carbon Films

1990 ◽  
Vol 48 (1) ◽  
pp. 318-319
Author(s):  
Mircea Fotino ◽  
D.C. Parks
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Amorphous Carbon ◽  
Carbon Films ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Amorphous Carbon Films ◽  
Image Optimization ◽  
Step Procedure ◽  
Stm Images

In the last few years scanning tunneling microscopy (STM) has made it possible and easily accessible to visualize surfaces of conducting specimens at the atomic scale. Such performance allows the detailed characterization of surface morphology in an increasing spectrum of applications in a wide variety of fields. Because the basic imaging process in STM differs fundamentally from its equivalent in other well-established microscopies, good understanding of the imaging mechanism in STM enables one to grasp the correct information content in STM images. It thus appears appropriate to explore by STM the structure of amorphous carbon films because they are used in many applications, in particular in the investigation of delicate biological specimens that may be altered through the preparation procedures.All STM images in the present study were obtained with the commercial instrument Nanoscope II (Digital Instruments, Inc., Santa Barbara, California). Since the importance of the scanning tip for image optimization and artifact reduction cannot be sufficiently emphasized, as stressed by early analyses of STM image formation, great attention has been directed toward adopting the most satisfactory tip geometry. The tips used here consisted either of mechanically sheared Pt/Ir wire (90:10, 0.010" diameter) or of etched W wire (0.030" diameter). The latter were eventually preferred after a two-step procedure for etching in NaOH was found to produce routinely tips with one or more short whiskers that are essentially rigid, uniform and sharp (Fig. 1) . Under these circumstances, atomic-resolution images of cleaved highly-ordered pyro-lytic graphite (HOPG) were reproducibly and readily attained as a standard criterion for easily recognizable and satisfactory performance (Fig. 2).

The nature of active centers catalyzing oxygen electro-reduction at platinum surfaces in alkaline media

2019 ◽  
Vol 12 (1) ◽  
pp. 351-357 ◽  
Author(s):  
Yunchang Liang ◽  
David McLaughlin ◽  
Christoph Csoklich ◽  
Oliver Schneider ◽  
Aliaksandr S. Bandarenka
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Alkaline Media ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Active Centers ◽  
Reaction Conditions ◽  
Electrochemical Scanning Tunneling Microscopy ◽  
Platinum Surfaces ◽  
Alkaline Electrolytes ◽  
Noise Measurements

The recently introduced electrochemical scanning tunneling microscopy noise measurements were applied to directly identify active centers for oxygen electro-reduction at Pt-based surfaces in three alkaline electrolytes under reaction conditions.

Atomic-scale surface science phenomena studied by scanning tunneling microscopy

2009 ◽  
Vol 603 (10-12) ◽  
pp. 1315-1327 ◽  
Author(s):  
F. Besenbacher ◽  
J.V. Lauritsen ◽  
T.R. Linderoth ◽  
E. Lægsgaard ◽  
R.T. Vang ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Surface Science ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Scale Surface
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