Bipolar charge transfer induced by water: experimental and first-principles studies

The mechanism underlying bipolar charge distribution in the context of triboelectrification remains ambiguous. Furthermore, water can either promote or inhibit triboelectrification. It was determined through experimental and first-principles calculations that water can also reverse the polarity of t...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2017, Vol.19 (43), p.29418-29423
Main Authors: Lin, Shi-Quan, Shao, Tian-Min
Format: Article
Language:English
Subjects:
Charge distribution
Charge transfer
Chemical bonds
First principles
Gold
Polarity
Water chemistry
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Summary:The mechanism underlying bipolar charge distribution in the context of triboelectrification remains ambiguous. Furthermore, water can either promote or inhibit triboelectrification. It was determined through experimental and first-principles calculations that water can also reverse the polarity of transferred charges and cause a bipolar charge transfer. We examined triboelectrification between an Au/Cr-coated tip and stoichiometric Si N film using Kelvin probe force microscopy. In addition, we investigated the generation of a bipolar charge distribution on the insulating Si N surface by controlling the frictional conditions. With regard to the effect of a water meniscus in the interface between the surface and tip, we predicted the dissociation of water molecules on the Si N surface and polarity reversing induced by water via first principles. Finally, we focused on the effect of water on the dangling bonds of Si atoms and surface states of Si N . The results indicated that the dangling bonds and surface states are essential to a bipolar charge transfer.
ISSN:1463-9076
1463-9084
DOI:10.1039/c7cp05609e