scholarly journals Heterogeneity of surface potential in contact electrification under ambient conditions: A comparison of pre- and post-contact states

2016 ◽  
Vol 81 ◽  
pp. 76-81 ◽  
Author(s):  
A.M. Barnes ◽  
A.D. Dinsmore
Keyword(s):  
Surface Potential ◽  
Ambient Conditions ◽  
Contact Electrification

Surface Characterization of Ga-doped ZnO layers

2011 ◽  
Vol 1315 ◽  
Author(s):  
J.D. McNamara ◽  
J.D. Ferguson ◽  
M. Foussekis ◽  
I. Ruchala ◽  
M.A. Reshchikov ◽  
...  
Keyword(s):  
Surface Potential ◽  
Surface Characterization ◽  
Charge Injection ◽  
Reverse Bias Voltage ◽  
Ambient Conditions ◽  
Kelvin Probe ◽  
Contact Mode ◽  
Kelvin Probe Microscopy ◽  
Voltage Sweep ◽  
Uv Illumination

ABSTRACTEpitaxial ZnO layers heavily doped with Ga (GZO) were grown at 400 °C under metaland oxygen-rich conditions in terms of metal-to-reactive oxygen ratio by plasma-assisted molecular beam epitaxy (MBE). Several atomic force microscopy (AFM) techniques were used to characterize the surface morphology and electrical properties of these GZO films in ambient conditions. Local I-V spectra indicate that layers grown under both O-rich and metal-rich conditions are highly resistive until a relatively high voltage sweep (±12 V) is used. After removal of an insulating surface layer, conduction is possible at lower voltages, but eventually the film resistivity increases and it again becomes insulating. In addition to local I-V spectra, local charge injection and subsequent surface potential measurements were used to probe surface charging characteristics. For charge injection experiments, a reverse-bias voltage is applied to the sample while scanning in contact mode with a metallized tip. The resultant change in surface potential due to trapped charge is subsequently observed using scanning Kelvin probe microscopy (SKPM). The layers deposited in a metal-rich environment demonstrate the expected behavior, but the O-rich layers show anomalous negative and positive charging. Finally, surface photovoltage (SPV) measurements using above-bandgap UV illumination were performed. The GZO layers produce SPV values of 0.4 to 0.5 eV, where the films deposited in an O-rich environment have slightly higher SPV values and faster restoration.

High voltage surface potential measurements in ambient conditions: Application to organic thin-film transistor injection and transport characterization

2016 ◽  
Vol 119 (12) ◽  
pp. 125501 ◽  
Author(s):  
Grégoire de Tournadre ◽  
Frédéric Reisdorffer ◽  
Reinhold Rödel ◽  
Olivier Simonetti ◽  
Hagen Klauk ◽  
...  
Keyword(s):  
Thin Film ◽  
Surface Potential ◽  
High Voltage ◽  
Thin Film Transistor ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor ◽  
Ambient Conditions ◽  
Surface Potential Measurements

scholarly journals Regeneration of an electret filter by contact electrification

RSC Advances ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 4610-4615
Author(s):  
Jakyung Eun ◽  
Hansol Lee ◽  
Sangmin Jeon
Keyword(s):  
Surface Potential ◽  
Filtration Efficiency ◽  
Contact Electrification ◽  
Electret Filter

Contact electrification restores the surface potential of a polypropylene electret filter for face masks and regenerates its filtration efficiency.

Excluding Contact Electrification in Surface Potential Measurement Using Kelvin Probe Force Microscopy

ACS Nano ◽  
2016 ◽  
Vol 10 (2) ◽  
pp. 2528-2535 ◽  
Author(s):  
Shengming Li ◽  
Yusheng Zhou ◽  
Yunlong Zi ◽  
Gong Zhang ◽  
Zhong Lin Wang
Keyword(s):  
Surface Potential ◽  
Kelvin Probe Force Microscopy ◽  
Kelvin Probe ◽  
Potential Measurement ◽  
Force Microscopy ◽  
Contact Electrification

Surface Potential Mapping of Patterned Self-Assembled Monolayers by Scanning Probe Microscopy

2002 ◽  
Vol 727 ◽  
Author(s):  
R. Ross Getty ◽  
Rodolfo Alvarez ◽  
Dawn A. Bonnell ◽  
Kenneth G. Sharp ◽  
Simona Percec ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
Surface Potential ◽  
Microcontact Printing ◽  
Self Assembled Monolayers ◽  
Ambient Conditions ◽  
Assembled Monolayers ◽  
Potential Mapping ◽  
Self Assembled ◽  
Scanning Surface Potential Microscopy ◽  
Surface Potential Mapping

AbstractSurface potentials of a number of patterned conducting and insulating self-assembled monolayers (SAMs) were measured by scanning surface potential microscopy (SSPM) as part of a study in molecular electronics. Differences in surface potential were measured for insulating and conducting molecule SAMs on gold. The SAMs were patterned by microcontact printing. High contrast patterns were observed by surface potential even when little imaging was possible in standard AFM modes. Surface potential differences of a few mV to 500 mV were observed under ambient conditions between adjacent SAMs of different compositions or between SAMs and the unmodified substrate.

The effects of surface absorbed monolayer microdiffraction patterns

1988 ◽  
Vol 46 ◽  
pp. 680-681
Author(s):  
M. Pan ◽  
J.M. Cowley
Keyword(s):  
Surface Potential ◽  
Electron Probe ◽  
Potential Distribution ◽  
Crystal Surface ◽  
Normal Direction ◽  
Surface Image ◽  
Extended Surface ◽  
Gas Molecules ◽  
Surface Nature ◽  
Electron Microdiffraction

Electron microdiffraction patterns, obtained when a small electron probe with diameter of 10-15 Å is directed to run parallel to and outside a flat crystal surface, are sensitive to the surface nature of the crystals. Dynamical diffraction calculations have shown that most of the experimental observations for a flat (100) face of a MgO crystal, such as the streaking of the central spot in the surface normal direction and (100)-type forbidden reflections etc., could be explained satisfactorily by assuming a modified image potential field outside the crystal surface. However the origin of this extended surface potential remains uncertain. A theoretical analysis by Howie et al suggests that the surface image potential should have a form different from above-mentioned image potential and also be smaller by several orders of magnitude. Nevertheless the surface potential distribution may in practice be modified in various ways, such as by the adsorption of a monolayer of gas molecules.

Hydrogen bonding in liquid methanol at ambient conditions and at high pressure

2000 ◽  
Vol 98 (3) ◽  
pp. 125-134 ◽  
Author(s):  
T. Weitkamp, J. Neuefeind, H. E. Fisch
Keyword(s):  
High Pressure ◽  
Hydrogen Bonding ◽  
Ambient Conditions

Modeling on Effects of Charging Time and Recombination on Surface Potential Decay Crossover of LDPE

2016 ◽  
Vol 136 (2) ◽  
pp. 86-92 ◽  
Author(s):  
Daomin Min ◽  
Shengtao Li ◽  
Guochang Li ◽  
George Chen
Keyword(s):  
Surface Potential ◽  
Charging Time ◽  
Potential Decay
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