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This content will become publicly available on January 8, 2017

Title: Nanoparticle shape evolution and proximity effects during tip-induced electrochemical processes

The voltage spectroscopies in scanning probe microscopy (SPM) techniques are widely used to investigate the electrochemical processes in nanoscale volumes, which are important for current key applications, such as batteries, fuel cells, catalysts, and memristors. The spectroscopic measurements are commonly performed on a grid of multiple points to yield spatially resolved maps of reversible and irreversible electrochemical functionalities. Hence, the spacing between measurement points is an important parameter to be considered, especially for irreversible electrochemical processes. Here, we report nonlocal electrochemical dynamics in chains of Ag particles fabricated by the SPM tip on a silver ion solid electrolyte. When the grid spacing is small compared with the size of the formed Ag particles, anomalous chains of unequally sized particles with double periodicity evolve. This behavior is ascribed to a proximity effect during the tip-induced electrochemical process, specifically, size-dependent silver particle growth following the contact between the particles. In addition, fractal shape evolution of the formed Ag structures indicates that the growth-limiting process changes from Ag+/Ag redox reaction to Ag+-ion diffusion with the increase in the applied voltage and pulse duration. Our study shows that characteristic shapes of the electrochemical products are good indicators for determining the underlying growth-limiting process, andmore » emergence of complex phenomena during spectroscopic mapping of electrochemical functionalities.« less
 [1] ;  [2] ;  [3] ;  [2] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Inst. for Basic Science (IBS), Seoul (Korea, Republic of)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Seoul National University, South Korea; Inst. of Basic Science, Seoul (Korea, Republic of)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 1936-0851
American Chemical Society
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY scanning probe microscopy; electrochemistry; silver; proximity effect; fractal; diffusion-limited aggregation