Hackl, T., Poik, M., & Schitter, G. (2022). Influence of Imaging Parameters on AFM Surface Potential Measurements in Aqueous Solutions. In 2022 IEEE 22nd International Conference on Nanotechnology (NANO) (pp. 39–42). https://doi.org/10.1109/NANO54668.2022.9928605
2022 IEEE 22nd International Conference on Nanotechnology (NANO)
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ISBN:
978-1-6654-5225-0
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Volume:
2022-July
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Date (published):
2022
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Event name:
2022 IEEE 22nd International Conference on Nanotechnology (NANO)
en
Event date:
4-Jul-2022 - 8-Jul-2022
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Event place:
Spain
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Number of Pages:
4
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Peer reviewed:
Yes
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Keywords:
aqueous solution; kelvin probe force microscopy; solid-liquid interface; surface potential
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Abstract:
This paper presents surface potential measurements by closed-loop AC-KPFM in aqueous solutions. In contrast to conventional KPFM, the proposed method omits the use of a dc-bias, therefore preventing electrochemical & electrokinetic effects, enabling operation in water. The ability for reproducible surface potential measurements in aqueous solutions is demonstrated and the influence of key imaging parameters on its performance are investigated, in particular the excitation frequency of the drive signal. It is found that proper operation of AC-KPFM in water is only possible in a regime, where movement of the ions in the solution is suppressed. In the case of highly deionized water, an excitation frequency of >30 kHz is necessary to achieve a comparable performance as conventional KPFM operation in air.
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Project (external):
FWF FFG
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Project ID:
P31238-N28 883916
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Research Areas:
Mathematical and Algorithmic Foundations: 50% Sensor Systems: 50%
