Epitaxy of Germanium on SI(001) Grating Templates

1993 ◽  
Vol 317 ◽  
Author(s):  
C.C. Umbach ◽  
J.M. Blakely
Keyword(s):  
Room Temperature ◽  
Elevated Temperatures ◽  
Scanning Tunneling ◽  
Growth Morphology ◽  
Tunneling Microscopy ◽  
Step Flow ◽  
Growth Modes ◽  
Step Density ◽  
Temperature Scanning ◽  
Substrate Temperatures

ABSTRACTEpitaxial Ge films (< 3 ML) have been grown at elevated temperatures on Si (001) grating substrates (repeat spacing of 2.0 μm) and imaged using room temperature scanning tunneling Microscopy (STM). The Ge films exhibit the 2×n reconstruction associated with missing dimer rows. The value of n and the growth morphology are influenced by the deposition rate and by annealing. At substrate temperatures of 600° C and deposition rates >0.5 ML/Min., islands elongated along the the dimer row direction nucleate at steps and on terraces. With sufficient annealing at 800° C, the islands coarsen and are eventually eliminated. The roughness of the A-type step becomes greater than that of the B-type step, which is the reverse of the situation with pure Si (001). The separation between missing dimer rows and hence the value of n are increased by annealing. Differences in substrate terrace widths due to the periodically varying step density of thegratings affect the growth Modes: two-dimensional islands occur near the extrema of the gratings whereas step flow occurs when steps are separated by ∼150 Å or less.

Growth of Co Nanoclusters on SiC Honeycomb Templates

2004 ◽  
Vol 818 ◽  
Author(s):  
Wei Chen ◽  
Kian Ping Loh ◽  
Hai Xu ◽  
A.T.S. Wee
Keyword(s):  
Substrate Temperature ◽  
Room Temperature ◽  
Scanning Tunneling ◽  
Nucleation Process ◽  
Desorption Rate ◽  
Tunneling Microscopy ◽  
Scale Range ◽  
Reconstructed Surface ◽  
Substrate Temperatures

AbstractA honeycomb-like SiC reconstructed surface with regular, periodic porosity in the nano-scale range has been used as an effective template for the formation of monodispersed Co nanoclusters. In-situ scanning tunneling microscopy (STM) was used to study the nucleation process of the Co nanoclusters on this template. The deposition of Co at different substrate temperature was investigated by STM. It is found that the failure in the deposition of Co nanoclusters on the SiC honeycomb template with substrate temperatures higher than room temperature (RT) might be due to the high desorption rate of the adsorbed Co atoms.

scholarly journals STM tip-assisted engineering of molecular nanostructures: PTCDA islands on Ge(001):H surfaces

2013 ◽  
Vol 4 ◽  
pp. 927-932 ◽  
Author(s):  
Amir A Ahmad Zebari ◽  
Marek Kolmer ◽  
Jakub S Prauzner-Bechcicki
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Temperature Scanning ◽  
Tetracarboxylic Dianhydride ◽  
Molecular Nanostructures

Islands composed of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) molecules are grown on a hydrogen passivated Ge(001):H surface. The islands are studied with room temperature scanning tunneling microscopy and spectroscopy. The spontaneous and tip-induced formation of the top-most layer of the island is presented. Assistance of the scanning probe seems to be one of the factors that facilitate and speed the process of formation of the top-most layer.

Room-Temperature Scanning Tunneling Microscopy Manipulation of Single C60Molecules at the Liquid−Solid Interface:  Playing Nanosoccer

2004 ◽  
Vol 108 (31) ◽  
pp. 11556-11560 ◽  
Author(s):  
Stefan J. H. Griessl ◽  
Markus Lackinger ◽  
Ferdinand Jamitzky ◽  
Thomas Markert ◽  
Michael Hietschold ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Solid Interface ◽  
Temperature Scanning

scholarly journals Adsorption characteristics of Er3N@C80on W(110) and Au(111) studied via scanning tunneling microscopy and spectroscopy

2017 ◽  
Vol 8 ◽  
pp. 1127-1134 ◽  
Author(s):  
Sebastian Schimmel ◽  
Zhixiang Sun ◽  
Danny Baumann ◽  
Denis Krylov ◽  
Nataliya Samoylova ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
High Mobility ◽  
Considerable Extent ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Endohedral Fullerenes ◽  
Adsorption Characteristics ◽  
Substrate Interaction ◽  
Temperature Scanning

We performed a study on the fundamental adsorption characteristics of Er3N@C80 deposited on W(110) and Au(111) via room temperature scanning tunneling microscopy and spectroscopy. Adsorbed on W(110), a comparatively strong bond to the endohedral fullerenes inhibited the formation of ordered monolayer islands. In contrast, the Au(111)-surface provides a sufficiently high mobility for the molecules to arrange in monolayer islands after annealing. Interestingly, the fullerenes modify the herringbone reconstruction indicating that the molecule–substrate interaction is of considerable extent. Investigations concerning the electronic structure of Er3N@C80/Au(111) reveals spatial variations dependent on the termination of the Au(111) at the interface.

STRUCTURE OF A PHTHALOCYANINE DYE ON ZnO

2019 ◽  
Vol 26 (06) ◽  
pp. 1850204
Author(s):  
HAO ZHENG ◽  
YONG XU ◽  
GUO-CAI DONG ◽  
JÖRG KRÖGER ◽  
RICHARD BERNDT
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Scanning Tunneling ◽  
Iron Phthalocyanine ◽  
Molecular Symmetry ◽  
First Principles Calculations ◽  
Tunneling Microscopy ◽  
Temperature Scanning ◽  
Orientation Of Molecules ◽  
Dye Molecule

Room temperature scanning tunneling microscopy was used to investigate the adsorption of a dye molecule, iron-phthalocyanine (FePc), on ZnO(0001). Submolecular resolution reveals the orientation of molecules with respect to crystallographic directions of the surface. Upon adsorption, the molecular symmetry is reduced. First-principles calculations trace these observations to a strong molecule-substrate bond, which induces deformations of the molecule.

Microscopy of Metal Oxide Surfaces

2000 ◽  
Vol 6 (4) ◽  
pp. 324-328
Author(s):  
Martin R. Castell ◽  
Sergei L. Dudarev ◽  
Christiane Muggelberg ◽  
Adrian P. Sutton ◽  
G. Andrew D. Briggs ◽  
...  
Keyword(s):  
Surface Structure ◽  
Room Temperature ◽  
Low Voltage ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Metal Oxide Surfaces ◽  
Electrically Conducting ◽  
Temperature Scanning ◽  
Electronic Surface ◽  
Voltage Scanning

Abstract Elevated temperature scanning tunneling microscopy is used to study oxides that are room temperature insulators but become sufficiently electrically conducting at higher temperatures to allow imaging to be performed. Atomic resolution images of NiO, CoO, and UO2 have been obtained in this fashion which allow surface structure and defect determination. To complement the experiments, modeling of the electronic surface structure reveals which atomic sites give rise to the contrast observed in the images. Low voltage scanning electron microscopy is used to image small equilibrium pores in UO2 single crystals to evaluate the surface energy ratio of the (111) to (001) surfaces.

Microscopy of Metal Oxide Surfaces

2000 ◽  
Vol 6 (4) ◽  
pp. 324-328 ◽  
Author(s):  
Martin R. Castell ◽  
Sergei L. Dudarev ◽  
Christiane Muggelberg ◽  
Adrian P. Sutton ◽  
G. Andrew D. Briggs ◽  
...  
Keyword(s):  
Surface Structure ◽  
Room Temperature ◽  
Low Voltage ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Metal Oxide Surfaces ◽  
Electrically Conducting ◽  
Temperature Scanning ◽  
Electronic Surface ◽  
Voltage Scanning

AbstractElevated temperature scanning tunneling microscopy is used to study oxides that are room temperature insulators but become sufficiently electrically conducting at higher temperatures to allow imaging to be performed. Atomic resolution images of NiO, CoO, and UO2 have been obtained in this fashion which allow surface structure and defect determination. To complement the experiments, modeling of the electronic surface structure reveals which atomic sites give rise to the contrast observed in the images. Low voltage scanning electron microscopy is used to image small equilibrium pores in UO2 single crystals to evaluate the surface energy ratio of the (111) to (001) surfaces.

Growth and Magnetic Structure of La0.67Sr0.33MnO3 Films

1997 ◽  
Vol 474 ◽  
Author(s):  
G. W. Brown ◽  
Q. X. Jia ◽  
E. J. Peterson ◽  
D. K. Hristova ◽  
M. F. Hundley ◽  
...  
Keyword(s):  
Magnetic Structure ◽  
Colossal Magnetoresistance ◽  
Room Temperature ◽  
Processing Parameters ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
Temperature Scanning ◽  
Dependent Transport ◽  
Increasing Temperature

ABSTRACTGrowth of LaMnO3 films that exhibit colossal magnetoresistance (CMR) has concentrated heavily on Ca doped materials. However, since the 33% Sr doped films are ferromagnetic at room temperature, they are ideal candidates for dual growth-magnetic structure studies using scanned probe techniques. In this study, interest was focused on the relations between growth/processing parameters, film morphology, and electronic/magnetic properties. In addition, films were grown on both LaA1O3 (LAO) and SrTiO3 (STO) to examine the results of stress induced by different substrate mismatches. La0.67Sr0.33MnO3 (LSMO) was grown using pulsed laser deposition (PLD) at temperatures between 500 °C and 800 °C. The film microstructure, crystallinity, and magnetic and electrical properties were characterized by room temperature scanning tunneling microscopy (STM), atomic force microscopy (AFM), magnetic force microscopy (MFM), x-ray diffraction, and temperature dependent transport and magnetization measurements. The growth trends follow those previously reported for Ca doped films. Grains increase in size with increasing temperature and coalesce into extended layers after annealing. Although topographic contributions complicate interpretation of some MFM data, local magnetic structure observed here is generally associated with film defects.

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