NDLI: Nucleation, aggregative growth and detachment of metal nanoparticles during electrodeposition at electrode surfaces

Content Provider	Royal Society of Chemistry (RSC)
Author	Lai, Stanley C. S. Unwin, Patrick R. Lazenby, Robert A. Kirkman, Paul M.
Copyright Year	2015
Abstract	The nucleation and growth of metal nanoparticles (NPs) on surfaces is of considerable interest with regard to creating functional interfaces with myriad applications. Yet, key features of these processes remain elusive and are undergoing revision. Here, the mechanism of the electrodeposition of silver on basal plane highly oriented pyrolytic graphite (HOPG) is investigated as a model system at a wide range of length scales, spanning electrochemical measurements from the macroscale to the nanoscale using scanning electrochemical cell microscopy (SECCM), a pipette-based approach. The macroscale measurements show that the nucleation process cannot be modelled as either truly instantaneous or progressive, and that step edge sites of HOPG do not play a dominant role in nucleation events compared to the HOPG basal plane, as has been widely proposed. Moreover, nucleation numbers extracted from electrochemical analysis do not match those determined by atomic force microscopy (AFM). The high time and spatial resolution of the nanoscale pipette set-up reveals individual nucleation and growth events at the graphite basal surface that are resolved and analysed in detail. Based on these results, corroborated with complementary microscopy measurements, we propose that a nucleation-aggregative growth-detachment mechanism is an important feature of the electrodeposition of silver NPs on HOPG. These findings have major implications for NP electrodeposition and for understanding electrochemical processes at graphitic materials generally.
Starting Page	1126
Ending Page	1138
Page Count	13
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	6
Issue Number	2
Journal	Chemical Science
DOI	10.1039/c4sc02792b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Pyrolysis NP Nucleation Microscopy Atomic-force microscopy Graphite Electrochemistry Electrochemical cell High Time (film) Pipette Electrophoretic deposition Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry

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