期刊
NANO LETTERS
卷 15, 期 8, 页码 5161-5167出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01388
关键词
Silver iodide; heteronanowire; size dependence; phase transition; conductivity
类别
资金
- World Premier International (WPI) Center for Materials Nanoarchitectonics (MANA)
- National Key Basic Research
- National Nature Science Foundation of China [2014CB931704, 11204308, 11174287, 51371166]
Nanoscaled ionic conductors are crucial for future nanodevices. A well-known ionic conductor, AgI, exhibited conductivity greater than 1 Omega(-1) cm(-1) in alpha-phase and transformed into poorly conducting beta-/gamma-phase below 147 degrees C, thereby limiting applications. Here, we report that transition temperatures both from the beta-/gamma- to alpha-phase (T-c up arrow) and the alpha- to beta-/gamma-phase (T-c down arrow) are tuned by AgI/Ag heteronanowires embedded in anodic aluminum oxide (AAO) membranes with 10-30 nm pores. T-c up arrow and T-c down arrow to correspondingly higher and lower temperature as pore size decreases, generating a progressively enlarged thermal hysteresis. T-c up arrow and T-c down arrow specifically achieve 185 and 52 degrees C in 10 nm pores, and the final survived conductivity reaches, similar to 8.3 x 10(-3) Omega(-1) cm(-1) at room temperature. Moreover, the low-temperature stabilizing alpha-phase (down to 21 degrees 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.
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