Nanoparticle Shape Evolution and Proximity Effects During Tip-Induced Electrochemical Processes

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Title
Nanoparticle Shape Evolution and Proximity Effects During Tip-Induced Electrochemical Processes
Author(s)
Sang Mo Yang; Mariappan Parans Paranthaman; Tae Won Noh; Sergei V. Kalinin; Evgheni Strelcov
Publication Date
2016-01
Journal
ACS NANO, v.10, no.1, pp.663 - 671
Publisher
AMER CHEMICAL SOC
Abstract
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. This study shows that characteristic shapes of the electrochemical products are good indicators for determining the underlying growth-limiting process, and emergence of complex phenomena during spectroscopic mapping of electrochemical functionalities. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2687
ISSN
1936-0851
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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