Shape-controlled continuous synthesis of metal nanostructures
Author(s)Sebastian Cabeza, Victor; Smith, Christopher D; Jensen, Klavs F
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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.
DepartmentMassachusetts Institute of Technology. Department of Chemical Engineering
Royal Society of Chemistry
Sebastian, Victor, Christopher D. Smith, and Klavs F. Jensen. “Shape-Controlled Continuous Synthesis of Metal Nanostructures.” Nanoscale 8.14 (2016): 7534–7543. © 2016 The Royal Society of Chemistry
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