We show an experimental technique for visualizing distributions of vibrational modes of molecules through mapping of an inelastic tunneling signal with a scanning tunneling microscope. A topographic information and signal processed by a lock-in amplifier were simultaneously imaged, where the feedback loop for the tunneling gap was engaged and a modulation voltage was superimposed to the gap voltage. The current signal used for the tunneling gap control was tuned by the filtering in order to minimize the response of the feedback loop caused by the modulation voltage. The effectiveness of this technique was demonstrated for a self-assembled monolayer composed of a mixture of normal and deuterated hexanethiol molecules, where both molecules have the same molecular length and the former was embedded in the matrix of the latter. Two types of molecules were successfully discriminated by chemical properties.
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August 2010
Research Article|
August 09 2010
Identification of a deuterated alkanethiol inserted in a hydrogenated alkanethiol self-assembled monolayer by mapping of an inelastic tunneling signal
Norio Okabayashi;
Norio Okabayashi
a)
Institute of Multidisciplinary Research for Advanced Materials (IMRAM),
Tohoku University
, 2-1-1, Katahira, Aoba, Sendai 980-8577, Japan
and CREST, Japan Science and Technology Agency (JST)
, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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Tadahiro Komeda
Tadahiro Komeda
b)
Institute of Multidisciplinary Research for Advanced Materials (IMRAM),
Tohoku University
, 2-1-1, Katahira, Aoba, Sendai 980-8577, Japan
and CREST, Japan Science and Technology Agency (JST)
, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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a)
Present address: Materials and Structures Laboratory, Tokyo Institute of Technology, 4259-R3-5, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
b)
Electronic mail: [email protected].
Rev. Sci. Instrum. 81, 084101 (2010)
Article history
Received:
May 29 2010
Accepted:
June 27 2010
Citation
Norio Okabayashi, Tadahiro Komeda; Identification of a deuterated alkanethiol inserted in a hydrogenated alkanethiol self-assembled monolayer by mapping of an inelastic tunneling signal. Rev. Sci. Instrum. 1 August 2010; 81 (8): 084101. https://doi.org/10.1063/1.3469777
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