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Formation of a Chain-like Water Single Molecule Junction with Pd Electrodes

Author(s):

Risa Fukuzumi, Satoshi Kaneko, Shintaro Fujii, Tomoaki Nishino, Manabu Kiguchi

Journal:

The Journal of Physical Chemistry C

Year:

2018

Volume:

122

Pages

4698-4703

DOI:

10.1021/acs.jpcc.7b12605

Abstract:

Atomic scale interaction between the water molecule and the Pd electrodes was investigated by the mechanically controllable break junction technique at cryogenic temperature. The interaction between the water molecule and the atomic scale Pd electrodes and the resultant formation of the single-molecule junction of the water molecule bridging the gap between the Pd electrodes were confirmed by vibrational spectroscopy where the water–Pd vibrational mode of 70 meV was identified. We found that no water dissociation occurred on the atomic scale Pd electrodes. The electronic transport measurement revealed that the water single molecule junction carried the electronic current in the ballistic transport regime and the conductance was determined to be 1 G0 where G0 is the conductance quantum. The length analysis and current-bias voltage measurement of the junction suggest that the single water molecule is connected to Pd atomic chain.

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