High-resolution imaging in liquids using frequency modulation atomic force microscopy is known to suffer from additional peaks in the resonance spectrum that are unrelated to the cantilever resonance. These unwanted peaks are caused by acoustic modes of the liquid and the setup arising from the indirect oscillation excitation by a piezoelectric transducer. Photothermal excitation has been identified as a suitable method for exciting the cantilever in a direct manner. Here, we present a simple design for implementing photothermal excitation in a modified Multimode scan head from Bruker. Our approach is based on adding a few components only to keep the modifications as simple as possible and to maintain the low noise level of the original setup with a typical deflection noise density of about 15 fm/
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February 2014
Research Article|
February 07 2014
Photothermal excitation setup for a modified commercial atomic force microscope
Holger Adam;
Holger Adam
1Institute of Physical Chemistry,
Johannes Gutenberg University Mainz
, Duesbergweg 10-14, 55099 Mainz, Germany
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Sebastian Rode;
Sebastian Rode
a)
1Institute of Physical Chemistry,
Johannes Gutenberg University Mainz
, Duesbergweg 10-14, 55099 Mainz, Germany
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Martin Schreiber;
Martin Schreiber
1Institute of Physical Chemistry,
Johannes Gutenberg University Mainz
, Duesbergweg 10-14, 55099 Mainz, Germany
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Kei Kobayashi;
Kei Kobayashi
2Department of Electronic Science and Engineering,
Kyoto University
, Katsura, Nishikyo, Kyoto 615-8510, Japan
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Hirofumi Yamada;
Hirofumi Yamada
2Department of Electronic Science and Engineering,
Kyoto University
, Katsura, Nishikyo, Kyoto 615-8510, Japan
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Angelika Kühnle
Angelika Kühnle
b)
1Institute of Physical Chemistry,
Johannes Gutenberg University Mainz
, Duesbergweg 10-14, 55099 Mainz, Germany
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a)
Present address: SmarAct GmbH, Schuette-Lanz-Str. 9, 26135 Oldenburg, Germany.
Rev. Sci. Instrum. 85, 023703 (2014)
Article history
Received:
December 02 2013
Accepted:
January 20 2014
Citation
Holger Adam, Sebastian Rode, Martin Schreiber, Kei Kobayashi, Hirofumi Yamada, Angelika Kühnle; Photothermal excitation setup for a modified commercial atomic force microscope. Rev. Sci. Instrum. 1 February 2014; 85 (2): 023703. https://doi.org/10.1063/1.4864084
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