A high precision surface potential imaging torsion pendulum facility to investigate physical mechanism of patch effect

The physical mechanism of the patch effect is still an open question. Thus, a high-precision surface potential mapping facility based on a specially designed electrostatically-controlled torsion pendulum is proposed in this paper. The facility not only features high sensitivity and a two-dimensional...

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Bibliographic Details
Published in:Review of scientific instruments 2023-02, Vol.94 (2), p.024501-024501
Main Authors: Song, Chi, Hu, Ming, Li, Ke, Luo, Peng-shun, Wang, Shun, Yin, Hang, Zhou, Zebing
Format: Article
Language:English
Subjects:
Frequency ranges
Mapping
Pendulums
Scientific apparatus & instruments
Sensitivity
Spatial distribution
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Summary:The physical mechanism of the patch effect is still an open question. Thus, a high-precision surface potential mapping facility based on a specially designed electrostatically-controlled torsion pendulum is proposed in this paper. The facility not only features high sensitivity and a two-dimensional mapping function but also adapts to various measurement requirements for centimeter-sized samples. The sensitivity of the torsion pendulum reaches about 2.0 × 10−14 N m/Hz1/2 in a frequency range of 1–8 mHz. The temporal variation of the surface potential can be detected at a level of 30 μV/Hz1/2 with a probe whose surface area is 7 mm2. The potential spatial distribution resolution comes to 0.1 mm2 at a level of 40 μV with 1 h integration time.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0097030