Stress dependence of the suspended graphene work function: Vacuum Kelvin probe force microscopy and density functional theory

2017 ◽  
Vol 110 (19) ◽  
pp. 193101 ◽  
Author(s):  
A. Volodin ◽  
C. Van Haesendonck ◽  
O. Leenaerts ◽  
B. Partoens ◽  
F. M. Peeters
Keyword(s):  
Density Functional Theory ◽  
Work Function ◽  
Density Functional ◽  
Kelvin Probe Force Microscopy ◽  
Stress Dependence ◽  
Kelvin Probe ◽  
Functional Theory ◽  
Suspended Graphene ◽  
Force Microscopy

scholarly journals Structurally Driven Environmental Degradation of Friction in MoS2 Films

2021 ◽  
Vol 69 (3) ◽  
Author(s):  
John F. Curry ◽  
Taisuke Ohta ◽  
Frank W. DelRio ◽  
Philip Mantos ◽  
Morgan R. Jones ◽  
...  
Keyword(s):  
Work Function ◽  
Density Functional ◽  
Surface Film ◽  
Kelvin Probe ◽  
Photoelectron Emission ◽  
Friction Behavior ◽  
Functional Theory ◽  
Contact Conditions ◽  
Force Microscopy ◽  
Dynamics Simulations

AbstractWe report an investigation of the friction mechanisms of MoS2 thin films under changing environments and contact conditions using a variety of computational and experimental techniques. Molecular dynamics simulations were used to study the effects of water and molecular oxygen on friction and bonding of MoS2 lamellae during initial sliding. Characterization via photoelectron emission microscopy (PEEM) and Kelvin probe force microscopy (KPFM) were used to determine work function changes in shear modified material within the top few nanometers of MoS2 wear scars. The work function was shown to change with contact conditions and environment, and shown by density functional theory (DFT) calculations and literature reports to be correlated with lamellae size and thickness of the basally oriented surface layer. Results from nanoscale simulations and macroscale experiments suggest that the evolution of the friction behavior of MoS2 is linked primarily to the formation or inhibition of a basally oriented, molecularly thin surface film with long-range order.

scholarly journals Work function difference of naphthyl end-capped oligothiophene in different crystal alignments studied by Kelvin probe force microscopy

2020 ◽  
pp. 106060
Author(s):  
Mads Nibe Larsen ◽  
Mads Svanborg Peters ◽  
Rodrigo Lemos-Silva ◽  
Demetrio A. Da Silva Filho ◽  
Bjarke Jørgensen ◽  
...  
Keyword(s):  
Work Function ◽  
Kelvin Probe Force Microscopy ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Work Function Difference ◽  
Function Difference

Relation between work function and structural properties of triangular defects in 4H-SiC epitaxial layer: Kelvin probe force microscopic and spectroscopic analyses

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8216-8229
Author(s):  
Hong-Ki Kim ◽  
Soo In Kim ◽  
Seongjun Kim ◽  
Nam-Suk Lee ◽  
Hoon-Kyu Shin ◽  
...  
Keyword(s):  
Work Function ◽  
Structural Properties ◽  
Epitaxial Layer ◽  
Kelvin Probe Force Microscopy ◽  
Kelvin Probe ◽  
Force Microscopy ◽  
Spectroscopic Analyses ◽  
Work Function Difference ◽  
Function Difference

In the defective SiC epitaxial layer, the work function variation was observed by Kelvin probe force microscopy (KPFM), and the work function difference came from the variation of polytype and the disordered surface.

WORK FUNCTION OF BORON CARBIDE: A DFT CALCULATION

2012 ◽  
Vol 19 (04) ◽  
pp. 1250040 ◽  
Author(s):  
CHUNSHAN HE ◽  
ZHIBING LI ◽  
WEILIANG WANG
Keyword(s):  
Density Functional Theory ◽  
Boron Carbide ◽  
Work Function ◽  
Density Functional ◽  
Dft Calculation ◽  
Slab Model ◽  
Functional Theory ◽  
Work Functions

The work functions of (001) and (00-1) surfaces of B4C are investigated with density functional theory and symmetry slab model. These two surfaces are found to be almost nonpolarized and their work functions are 5.15 eV and 5.46 eV, respectively.

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