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Issue 14, 2016
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Shape-controlled continuous synthesis of metal nanostructures

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Abstract

A segmented flow-based microreactor is used for the continuous production of faceted nanocrystals. Flow segmentation is proposed as a versatile tool to manipulate the reduction kinetics and control the growth of faceted nanostructures; tuning the size and shape. Switching the gas from oxygen to carbon monoxide permits the adjustment in nanostructure growth from 1D (nanorods) to 2D (nanosheets). CO is a key factor in the formation of Pd nanosheets and Pt nanocubes; operating as a second phase, a reductant, and a capping agent. This combination confines the growth to specific structures. In addition, the segmented flow microfluidic reactor inherently has the ability to operate in a reproducible manner at elevated temperatures and pressures whilst confining potentially toxic reactants, such as CO, in nanoliter slugs. This continuous system successfully synthesised Pd nanorods with an aspect ratio of 6; thin palladium nanosheets with a thickness of 1.5 nm; and Pt nanocubes with a 5.6 nm edge length, all in a synthesis time as low as 150 s.

Graphical abstract: Shape-controlled continuous synthesis of metal nanostructures

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Supplementary files

Article information


Submitted
01 Dec 2015
Accepted
10 Feb 2016
First published
01 Mar 2016

This article is Open Access

Nanoscale, 2016,8, 7534-7543
Article type
Paper

Shape-controlled continuous synthesis of metal nanostructures

V. Sebastian, C. D. Smith and K. F. Jensen, Nanoscale, 2016, 8, 7534
DOI: 10.1039/C5NR08531D

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