Direct Measurement of Time Dependent Diffusion for Ag and Au under Ambient Conditions

作者：Yoo Pil Sun^*; Jo Han Yeol; Kim Taekyeong

来源：Journal of the Korean Physical Society, 2014, 65(11): 1825-1828.

DOI：10.3938/jkps.65.1825

• Scanning tunneling microscope based break-junction
• Atomic diffusion
• Ag and Au electrodes
• Cross-correlation
• Molecular dynamics

Time-dependent diffusion for Ag and Au metal atoms was measured using the scanning tunneling microscope break-junction technique in ambient conditions. We observed that Ag contacts do not form long single-atomic chains compared to Au contacts during the elongation of each metal electrode, and Ag atoms diffuse more quickly than Au atoms after metal contact rupture. This is consistent with previous results of molecular dynamic simulations. Further, we found a correlation between diffusion length and the evolution time on an atomic scale to reveal the time-dependent diffusion for Ag and Au metal atoms.

• 出版日期2014-12