Understanding and Controlling the Aggregative Growth of Platinum Nanoparticles in Atomic Layer Deposition: an Avenue to Size Selection

Research output: Contribution to journalArticleScientificpeer-review

58 Citations (Scopus)
37 Downloads (Pure)

Abstract

We present an atomistic understanding of the evolution of the size distribution with temperature and number of cycles in atomic layer deposition (ALD) of Pt nanoparticles (NPs). Atomistic modeling of our experiments teaches us that the NPs grow mostly via NP diffusion and coalescence rather than through single-atom processes such as precursor chemisorption, atom attachment, and Ostwald ripening. In particular, our analysis shows that the NP aggregation takes place during the oxygen half-reaction and that the NP mobility exhibits a size- and temperature-dependent scaling. Finally, we show that contrary to what has been widely reported, in general, one cannot simply control the NP size by the number of cycles alone. Instead, while the amount of Pt deposited can be precisely controlled over a wide range of temperatures, ALD-like precision over the NP size requires low deposition temperatures (e.g., T < 100 °C) when growth is dominated by atom attachment.
Original languageEnglish
Pages (from-to)975-983
Number of pages9
JournalThe Journal of Physical Chemistry Letters
Volume8
Issue number5
DOIs
Publication statusPublished - 2017

Fingerprint

Dive into the research topics of 'Understanding and Controlling the Aggregative Growth of Platinum Nanoparticles in Atomic Layer Deposition: an Avenue to Size Selection'. Together they form a unique fingerprint.

Cite this