Analysis of capacitive force acting on a cantilever tip at solid/liquid interfaces

Ken-ichi Umeda; Kei Kobayashi; Noriaki Oyabu; Yoshiki Hirata; Kazumi Matsushige; Hirofumi Yamada

doi:10.1063/1.4801795

journal article Apr 18, 2013

Analysis of capacitive force acting on a cantilever tip at solid/liquid interfaces

Ken-ichi Umeda Kei Kobayashi Noriaki Oyabu Yoshiki Hirata Kazumi Matsushige Hirofumi Yamada

Journal of Applied Physics Vol. 113 No. 15 · AIP Publishing

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Abstract

Dielectric properties of biomolecules or biomembranes are directly related to their structures and biological activities. Capacitance force microscopy based on the cantilever deflection detection is a useful scanning probe technique that can map local dielectric constant. Here we report measurements and analysis of the capacitive force acting on a cantilever tip at solid/liquid interfaces induced by application of an alternating voltage to explore the feasibility of the measurements of local dielectric constant by the voltage modulation technique in aqueous solutions. The results presented here suggest that the local dielectric constant measurements by the conventional voltage modulation technique are basically possible even in polar liquid media. However, the cantilever deflection is not only induced by the electrostatic force, but also by the surface stress, which does not include the local dielectric information. Moreover, since the voltage applied between the tip and sample are divided by the electric double layer and the bulk polar liquid, the capacitive force acting on the apex of the tip are strongly attenuated. For these reasons, the lateral resolution in the local dielectric constant measurements is expected to be deteriorated in polar liquid media depending on the magnitude of dielectric response. Finally, we present the criteria for local dielectric constant measurements with a high lateral resolution in polar liquid media.

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Details

Published: Apr 18, 2013
Vol/Issue: 113(15)

Authors

K

Ken-ichi Umeda

Department of Electronic Science and Engineering 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan; Kyoto University 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan

K

Kei Kobayashi

Office of Society-Academia Collaboration for Innovation, Kyoto University, Katsura, Nishikyo 2 , Kyoto 615-8520, Japan

N

Noriaki Oyabu

Department of Electronic Science and Engineering 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan; Kyoto University 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan; JST Development of Systems and Technology for Advanced Measurement and Analysis 3 , Honcho, Kawaguchi 332-0012, Japan

Y

Yoshiki Hirata

Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology 4 , 1-1-1 Higashi, Tsukuba 305-8566, Japan

K

Kazumi Matsushige

Department of Electronic Science and Engineering 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan; Kyoto University 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan

H

Hirofumi Yamada

Department of Electronic Science and Engineering 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan; Kyoto University 1 , , Katsura, Nishikyo, Kyoto 615-8510, Japan

Cite This Article

Ken-ichi Umeda, Kei Kobayashi, Noriaki Oyabu, et al. (2013). Analysis of capacitive force acting on a cantilever tip at solid/liquid interfaces. Journal of Applied Physics, 113(15). https://doi.org/10.1063/1.4801795

Analysis of capacitive force acting on a cantilever tip at solid/liquid interfaces

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