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Kou L, Ma Z, Li YJ, et al. Surface potential imaging with atomic resolution by frequency-modulation Kelvin probe force microscopy without bias voltage feedback. Nanotechnology. 2015;26(19):195701doi: 10.1088/0957-4484/26/19/195701.
Kou, L., Ma, Z., Li, Y. J., Naitoh, Y., Komiyama, M., & Sugawara, Y. (2015). Surface potential imaging with atomic resolution by frequency-modulation Kelvin probe force microscopy without bias voltage feedback. Nanotechnology, 26(19), 195701. https://doi.org/10.1088/0957-4484/26/19/195701
Kou, Lili, et al. "Surface potential imaging with atomic resolution by frequency-modulation Kelvin probe force microscopy without bias voltage feedback." Nanotechnology vol. 26,19 (2015): 195701. doi: https://doi.org/10.1088/0957-4484/26/19/195701
Kou L, Ma Z, Li YJ, Naitoh Y, Komiyama M, Sugawara Y. Surface potential imaging with atomic resolution by frequency-modulation Kelvin probe force microscopy without bias voltage feedback. Nanotechnology. 2015 May 15;26(19):195701. doi: 10.1088/0957-4484/26/19/195701. Epub 2015 Apr 21. PMID: 25895740.
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Nanotechnology. 2015 May 15;26(19):195701. doi: 10.1088/0957-4484/26/19/195701. Epub 2015 Apr 21.

Surface potential imaging with atomic resolution by frequency-modulation Kelvin probe force microscopy without bias voltage feedback.

Nanotechnology

Lili Kou, Zongmin Ma, Yan Jun Li, Yoshitaka Naitoh, Masaharu Komiyama, Yasuhiro Sugawara

Affiliations

  1. Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

PMID: 25895740 DOI: 10.1088/0957-4484/26/19/195701

Abstract

We investigated the capability of obtaining atomic resolution surface potential images by frequency-modulation Kelvin probe force microscopy (FM-KPFM) without bias voltage feedback. We theoretically derived equations representing the relationship between the contact potential difference and the frequency shift (Δf) of an oscillating cantilever. For the first time, we obtained atomic resolution images and site-dependent spectroscopic curves for Δf and VLCPD on a Si (111)-7 × 7 surface. FM-KPFM without bias voltage feedback does not involve the influence of the FM-KPFM controller because it has no deviation from a parabolic dependence of Δf on the dc-bias voltage. It is particularly suitable for investigation on molecular electronics and organic photovoltaics, because electron or ion movement induced by dc bias is avoided and the electrochemical reactions are inhibited.

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