Effect of UV/Ozone Treatment on Nanogap Electrodes for Molecular Devices
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概要
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We report the effect of UV/ozone treatment on nanogap electrodes for molecular devices. Gold nanogap electrodes with a nominal gap of 1–2 nm were fabricated by double oblique deposition and the break-junction technique. Self-assembled monolayers (SAMs) of 4,4$'$-p-terphenyldithiol (TPDT) were formed on the surfaces of the nanogap electrodes, and the electronic properties of these electrodes were measured. The device characteristics were also measured after repeated UV/ozone treatment and SAM re-formation. Although the resistance of the nanogap electrodes increased with the number of UV/ozone treatments, they could subsequently be used for molecular devices. We also observed Coulomb-diamond (CD) structures in the conductance contour plot with respect to the drain and gate voltages even after UV/ozone treatment. Some of the CDs observed after the treatment were aperiodic, presumably reflecting the discrete energy levels in TPDT.
- 2007-04-15
著者
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Nagase Masao
Ntt Basic Research Laboratories
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Ono Yukinori
NTT Basic Research Laboratories
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Inokawa Hiroshi
Research Institute Of Electronics Shizuoka Univ.
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SUMITOMO Koji
NTT Basic Research Laboratories
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TORIMITSU Keiichi
NTT Basic Research Laboratories
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Goto Touichiro
Ntt Basic Res. Lab. Kanagawa Jpn
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Inokawa Hiroshi
Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8011, Japan
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Nagase Masao
NTT Basic Research Laboratories, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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