Mechanistic Understanding of Formation of Ultrathin Single-Crystalline Pt Nanowires

Samantaray, D and Gayen, M and Roy, A and Bellare, P and Ravishankar, N (2021) Mechanistic Understanding of Formation of Ultrathin Single-Crystalline Pt Nanowires. In: Journal of Physical Chemistry C .

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Abstract

Engineering anisotropic nanostructures of isotropic FCC metals (Au, Pt, or Pd) requires a symmetry-breaking mechanism. In wet chemical synthesis methods, a judicious selection of capping agents can help achieve the desired morphology. However, understanding the mechanism of formation is challenging due to the complex chemical environment and the limitation of time resolution to investigate the fast reactions. Here, we present the formation mechanism of ultrathin single-crystalline Pt nanowires using detailed electron microscopy investigations. Various control experiments performed suggest that the binding of ligand to the Pt surface (primary vs secondary amine) plays a crucial role not only in dictating the morphology but also in controlling the nanowire growth direction. Further, a ligand-exchange mechanism is adopted to separate these as-synthesized Pt nanowire bundles into well-separated wires. This is found to be a crucial step in controlling the surface accessibility and hence improving the electrocatalytic activity of the nanowires. ©

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society
Keywords:	Amines; Crystalline materials; Ligands; Morphology; Platinum; Platinum compounds, Anisotropic nanostructures; FCC metals; Isotropics; Mechanistics; Pt nanowires; Single-crystalline; Symmetry breakings; Synthesis method; Ultra-thin; Wet chemical synthesis, Nanowires
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	04 Jan 2022 05:42
Last Modified:	04 Jan 2022 05:42
URI:	http://eprints.iisc.ac.in/id/eprint/70861

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