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Zhang H, Tsuchiya T, Liang C, et al. Size-Controlled AgI/Ag Heteronanowires in Highly Ordered Alumina Membranes: Superionic Phase Stabilization and Conductivity. Nano Lett. 2015;15(8):5161-7doi: 10.1021/acs.nanolett.5b01388.
Zhang, H., Tsuchiya, T., Liang, C., & Terabe, K. (2015). Size-Controlled AgI/Ag Heteronanowires in Highly Ordered Alumina Membranes: Superionic Phase Stabilization and Conductivity. Nano letters, 15(8), 5161-7. https://doi.org/10.1021/acs.nanolett.5b01388
Zhang, Hemin, et al. "Size-Controlled AgI/Ag Heteronanowires in Highly Ordered Alumina Membranes: Superionic Phase Stabilization and Conductivity." Nano letters vol. 15,8 (2015): 5161-7. doi: https://doi.org/10.1021/acs.nanolett.5b01388
Zhang H, Tsuchiya T, Liang C, Terabe K. Size-Controlled AgI/Ag Heteronanowires in Highly Ordered Alumina Membranes: Superionic Phase Stabilization and Conductivity. Nano Lett. 2015 Aug 12;15(8):5161-7. doi: 10.1021/acs.nanolett.5b01388. Epub 2015 Jul 21. PMID: 26189765.
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Nano Lett. 2015 Aug 12;15(8):5161-7. doi: 10.1021/acs.nanolett.5b01388. Epub 2015 Jul 21.

Size-Controlled AgI/Ag Heteronanowires in Highly Ordered Alumina Membranes: Superionic Phase Stabilization and Conductivity.

Nano letters

Hemin Zhang, Takashi Tsuchiya, Changhao Liang, Kazuya Terabe

Affiliations

  1. †International Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
  2. ‡Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

PMID: 26189765 DOI: 10.1021/acs.nanolett.5b01388

Abstract

Nanoscaled ionic conductors are crucial for future nanodevices. A well-known ionic conductor, AgI, exhibited conductivity greater than 1 Ω(-1) cm(-1) in α-phase and transformed into poorly conducting β-/γ-phase below 147 °C, thereby limiting applications. Here, we report that transition temperatures both from the β-/γ- to α-phase (Tc↑) and the α- to β-/γ-phase (Tc↓) are tuned by AgI/Ag heteronanowires embedded in anodic aluminum oxide (AAO) membranes with 10-30 nm pores. Tc↑ and Tc↓ shift to correspondingly higher and lower temperature as pore size decreases, generating a progressively enlarged thermal hysteresis. Tc↑ and Tc↓ specifically achieve 185 and 52 °C in 10 nm pores, and the final survived conductivity reaches ∼8.3 × 10(-3) Ω(-1) cm(-1) at room temperature. Moreover, the low-temperature stabilizing α-phase (down to 21 °C, the lowest in state of the art temperatures) is reproducible and survives further thermal cycling. The low-temperature phase stabilization and enhancement conductivity reported here suggest promising applications in silver-ion-based future nanodevices.

Keywords: Silver iodide; conductivity; heteronanowire; phase transition; size dependence

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