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Name (Title):
Kazuya Terabe (MANA Scientist)
Affiliation:
International Center for Materials Nanoarchitectonics
(MANA), NIMS
Address:
1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Email: TERABE.Kazuya@nims.go.jp
Home Page:
Presentation Title:
Synthesis and characterization of ionic conductor nanowires for unique nanoionics devices
Abstract:
Pure ionic conductor (solid electrolyte) and ion/electron mixed conductor materials have
attracted great interest because of their solid electrochemical properties and their device
applications such as a fuel cell and a lithium ion battery. Recently, the solid ionics research filed
based on a nanotechnology, namely, the nanoionics becomes very hot topics. The nonionics
research has possibility to improve the conventional fuel
cell and lithium ion battery, further to create the new type
of nanodevices that could overcome the limitation of
current devices. The nanowire of the ionic conductor is
one of promising materials to explore the interesting
nanoionics phenomena and create the nanodevice. We
found nanostructure of metal chalcogenide based mixed
conductor, such as silver sulfide(Ag2S), have shown the
great interest as novel nonvolatile nanoswitching. [1] In
this study, we have electrochemically synthesized the
Ag2S nanowire array embedded in a porous alumina
template. [2] Fig. 1 shows the SEM image of the
synthesized Ag2S nanowire after the removal of the
alumina template. The nanowire shows the nano-effect
on the phase stability. The phase transition point
decreases with decreasing the diameter. We also
characterized the local structure of the nanowire using
SNOM Raman spectroscopy, which reveals the core-shell
structures are formed in the Ag2S nanowires embedded in
the alumina template. It is found that the nanowire array
embedded in the alumina template shows the high ionic
conductivity and the resistive switching as shown in
Fig.2. The results show the high-density integrated
switching could be created using the ionic conductor
nanowire array.
References:
[1] K. Terabe, T. Hasegawa, T. Nakayama, and M. Aono, Nature Vol. 433 (2005) 47
[2] C. H. Liang, K. Terabe, T. Hasegawa, M. Aono, et al, Small Vol. 1 (2005) 971
Poster Session PS-9
Fig.1 Nano-effect on the phase stability of
Ag2S nanowires and the SEM image of
the nanowire.
Fig.2 Resistive switching realized by the
nanoionics phenomenon in the Ag2S
nanowire.
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