The surface topography of pyrolitic carbons and of gold thin films by scanning tunneling microscopy:grain boundaries and surface defects

Vacuum ◽  
1989 ◽  
Vol 39 (5) ◽  
pp. 526-527
Keyword(s):  
Thin Films ◽  
Surface Topography ◽  
Surface Defects ◽  
Scanning Tunneling ◽  
Gold Thin Films

MEASUREMENT OF CRITICAL EXPONENTS OF NANOSTRUCTURED GOLD THIN FILMS

2003 ◽  
Vol 10 (06) ◽  
pp. 903-908 ◽  
Author(s):  
L. L. MELO ◽  
M. C. SALVADORI ◽  
M. CATTANI
Keyword(s):  
Thin Films ◽  
Critical Exponents ◽  
Growth Dynamics ◽  
Scanning Tunneling ◽  
Silicon Substrates ◽  
Tunneling Microscopy ◽  
Grain Sizes ◽  
Metal Plasma ◽  
Nanostructured Gold ◽  
Gold Thin Films

We have fabricated gold thin films by metal plasma ion deposition on silicon substrates. The roughness of these nanostructured films has been measured by scanning tunneling microscopy (STM) and we have determined the growth dynamics critical exponents. We have also measured the grain sizes as a function of the film thickness.

Surface defects on MgO thin films: Their detection using metastable impact electron spectroscopy and interaction with probe molecules

2000 ◽  
Vol 648 ◽  
Author(s):  
Jeffrey A. Stultz ◽  
Andrei Kolmakov ◽  
Xiaofeng Lai ◽  
Young Dok Kim ◽  
D. Wayne Goodman
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Electron Spectroscopy ◽  
Surface Defects ◽  
Defect Density ◽  
Thermal Quenching ◽  
Scanning Tunneling ◽  
Extended Defects ◽  
Tunneling Microscopy ◽  
Defect Sites

AbstractMgO thin films having different defect densities are explored in this study using metastable impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS), temperature programmed desorption (TPD), and scanning tunneling microscopy (STM). Surface point defects on MgO exhibit themselves in both the MIES and UPS spectra as a feature approximately 2 eV above the valance band, whereas extended defects are only observed spectroscopically as a broadening of the O 2p band. The interaction of NO and N2O with the MgO surface as a function of surface defect density is explored. Upon adsorption on MgO thin films at 100K, both NO and N2O show the development of three features which coincide with a standard gas phase N2O spectrum. The saturation coverage of N2O from NO adsorption increases with increasing defect density, indicating that defect sites are mainly responsible for N2O formation. STM images confirm the increase of thin film defect density upon thermal quenching.

Scanning tunneling potentiometry studies of Y1Ba2Cu3O7−x and gold thin films

1990 ◽  
Vol 8 (1) ◽  
pp. 459-463 ◽  
Author(s):  
A. D. Kent ◽  
I. Maggio‐Aprile ◽  
Ph. Niedermann ◽  
Ch. Renner ◽  
O/. Fischer
Keyword(s):  
Thin Films ◽  
Scanning Tunneling ◽  
Gold Thin Films

KINETIC SURFACE ROUGHENING OF PLATINUM AND GOLD THIN FILMS

2005 ◽  
Vol 12 (05n06) ◽  
pp. 675-679 ◽  
Author(s):  
M. CATTANI ◽  
M. C. SALVADORI
Keyword(s):  
Thin Films ◽  
Growth Exponent ◽  
Vacuum Arc ◽  
Scanning Tunneling ◽  
Surface Roughening ◽  
Tunneling Microscopy ◽  
Dynamical Scaling ◽  
Glass Substrates ◽  
Vacuum Arc Deposition ◽  
Gold Thin Films

Platinum and gold thin films have been fabricated by filtered vacuum arc deposition perpendicularly on rough silicon and glass substrates. Four sets of samples have been prepared with different thickness (d). Two sets were very thin films of Pt (1.31 ≤ d ≤ 11.66 nm ) and Au (1.77 ≤ d ≤ 10.46 nm ) and two sets were thicker films also of Pt (7 ≤ d ≤ 80 nm ) and Au (34 ≤ d ≤ 200 nm ). The roughness mean-square ω of the films have been measured, as a function of the film thickness d, by scanning tunneling microscopy (STM). We verified that the dynamical scaling relation ω(t) ~ tβ, where β is the growth exponent, is obeyed for the thicker films but it is not obeyed for the very thin films. These cases are analyzed taking into account the films growth theory.

scholarly journals Effect of Growth Temperature on the Characteristics of CsPbI3-Quantum Dots Doped Perovskite Film

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4439
Author(s):  
Shui-Yang Lien ◽  
Yu-Hao Chen ◽  
Wen-Ray Chen ◽  
Chuan-Hsi Liu ◽  
Chien-Jung Huang
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Quantum Dots ◽  
Quantum Dot ◽  
Growth Temperature ◽  
Electron Mobility ◽  
Surface Defects ◽  
Different Temperatures ◽  
Pb Doping ◽  
Pristine Film

In this study, adding CsPbI3 quantum dots to organic perovskite methylamine lead triiodide (CH3NH3PbI3) to form a doped perovskite film filmed by different temperatures was found to effectively reduce the formation of unsaturated metal Pb. Doping a small amount of CsPbI3 quantum dots could enhance thermal stability and improve surface defects. The electron mobility of the doped film was 2.5 times higher than the pristine film. This was a major breakthrough for inorganic quantum dot doped organic perovskite thin films.

scholarly journals Relationship between structure, surface topography and tribo-mechanical behavior of Ti-N thin films elaborated at different N2 flow rates

2021 ◽  
Vol 724 ◽  
pp. 138598
Author(s):  
Linda AISSANI ◽  
Akram ALHUSSEIN ◽  
Abdelhak AYAD ◽  
Corinne NOUVEAU ◽  
Elia ZGHEIB ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Behavior ◽  
Surface Topography ◽  
Flow Rates ◽  
Structure Surface

scholarly journals Strain-Relief Patterns and Kagome Lattice in Self-Assembled C60 Thin Films Grown on Cd(0001)

2021 ◽  
Vol 22 (13) ◽  
pp. 6880
Author(s):  
Zilong Wang ◽  
Minlong Tao ◽  
Daxiao Yang ◽  
Zuo Li ◽  
Mingxia Shi ◽  
...  
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Scanning Tunneling ◽  
Kagome Lattice ◽  
Tunneling Microscopy ◽  
Kagomé Lattice ◽  
Temperature Scanning ◽  
C60 Films

We report an ultra-high vacuum low-temperature scanning tunneling microscopy (STM) study of the C60 monolayer grown on Cd(0001). Individual C60 molecules adsorbed on Cd(0001) may exhibit a bright or dim contrast in STM images. When deposited at low temperatures close to 100 K, C60 thin films present a curved structure to release strain due to dominant molecule–substrate interactions. Moreover, edge dislocation appears when two different wavy structures encounter each other, which has seldomly been observed in molecular self-assembly. When growth temperature rose, we found two forms of symmetric kagome lattice superstructures, 2 × 2 and 4 × 4, at room temperature (RT) and 310 K, respectively. The results provide new insight into the growth behavior of C60 films.

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