Formation of Single Cu Atomic Chain in Nitrogen Atmosphere

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• 作者：Satoshi Kaneko ; Yuuga Nakamura ; Jinjiang Zhang ; Xiongbo Yang ; Jianwei Zhao ; Manabu Kiguchi
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：January 8, 2015
• 年：2015
• 卷：119
• 期：1
• 页码：862-866
• 全文大小：272K
• ISSN：1932-7455

文摘

We study the conductance and geometry of the Cu atomic junction in the presence of N₂, through combination of experimental measurement and theoretical calculation. A mechanically controllable break-junction measurement at low temperature reveals N₂ molecules stabilize a Cu atomic junction, and reduce its conductance value. The length analysis about the Cu atomic junction indicates that it is elongated with the length of a few atoms, although it is not elongated without molecules. We investigate Cu atomic junction鈥檚 geometry by calculating the conductance and total energies of the several models by changing the separation between two Cu electrodes. Through combination of experimental and theoretical study, we show that the Cu linear atomic chain is formed with the support of N₂ molecule, and N₂ molecule attached on the Cu linear atomic chain. The formation of Cu linear atomic chain is explained that attached N₂ molecules reduce the surface energy of the Cu atomic junction or N₂ molecule directly supports the Cu鈥揅u bond.