Fine-Tuning Porosity and Time-Resolved Observation of the Nucleation and Growth of Single Platinum Nanoparticles

ACS Nano
Matthew W Glasscott, Jeffrey E Dick

Abstract

Porous metal nanoparticles (NPs) are important to a variety of applications; however, robust control over NP porosity is difficult to achieve. Here, we demonstrate control over NP porosity using nanodroplet-mediated electrodeposition by introducing glycerol into water droplets. Porosity approached 0 under viscous conditions (>6 cP), and intermediate viscosities allowed the fine-tuning of NP porosity between 0 and 15%. This method also allowed for control over average pore radius (1 to 5 nm) and pore density (2 to 6 × 1015 pores per square meter). Reduced mass transfer within water droplets was validated by studying single chloroplatinate-filled water droplet (droplet radius of ∼450 nm) collisions on a platinum ultramicroelectrode (UME, rUME = 5 μm). Collision transient lifetimes in the i- t response increased with increasing viscosity, and the total charge per event was conserved. The change in shape was consistent with the nucleation and growth of a platinum NP within the droplet, which was confirmed by fitting transients to classical nucleation and growth theory for single centers as a function of over-potential. This analysis allowed electrokinetic growth and diffusion-controlled growth to be distinguished and semi-quantifie...Continue Reading

References

Dec 29, 2006·Small·Xiaowei TengHong Yang
Jul 3, 2010·Science·Hiroyasu FurukawaOmar M Yaghi
Mar 20, 2014·Journal of the American Chemical Society·Byung-Kwon KimAllen J Bard
Sep 16, 2014·Journal of the American Chemical Society·Jeffrey E DickAllen J Bard
Jun 14, 2016·Journal of the American Chemical Society·Jeffrey E Dick, Allen J Bard
Jun 13, 2018·Analytical Chemistry·Matthew W Glasscott, Jeffrey E Dick

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Citations

Feb 25, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Matthew W GlasscottJeffrey E Dick
Jun 24, 2021·Proceedings of the National Academy of Sciences of the United States of America·Kathryn J VannoyJeffrey E Dick
Jun 15, 2021·Chemical Science·Vignesh Sundaresan, Paul W Bohn
May 23, 2020·The Journal of Physical Chemistry Letters·Matthew W Glasscott, Jeffrey E Dick
May 30, 2020·ACS Nano·Won-Tae KooIl-Doo Kim
Jun 20, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Connor K Terry WeatherlyJeffrey E Dick
Feb 4, 2022·Nanoscale·Joshua Reyes-MoralesJeffrey E Dick

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