Direct Observation of Early Stages of Growth of Multilayered DNA-Templated Au-Pd-Au Core-Shell Nanoparticles in Liquid Phase Bhattarai, Nabraj Prozorov, Tanya
dc.contributor.department Ames Laboratory 2019-08-24T11:50:30.000 2020-06-29T23:22:24Z 2020-06-29T23:22:24Z 2019-02-26
dc.description.abstract <p>We report here on direct observation of early stages of formation of multilayered bimetallic Au-Pd core-shell nanocubes and Au-Pd-Au core-shell nanostars in liquid phase using low-dose <em>in situ</em> scanning transmission electron microscopy (S/TEM) with the continuous flow fluid cell. The reduction of Pd and formation of Au-Pd core-shell is achieved through the flow of the reducing agent. Initial rapid growth of Pd on Au along <111> direction is followed by a slower rearrangement of Pd shell. We propose the mechanism for the DNA-directed shape transformation of Au-Pd core-shell nanocubes to adopt a nanostar-like morphology in the presence of T30 DNA and discuss the observed nanoparticle motion in the confined volume of the fluid cell. The growth of Au shell over Au-Pd nanocube is initiated at the vertices of the nanocubes, leading to the preferential growth of the {111} facets and resulting in formation of nanostar-like particles. While the core-shell nanostructures formed in a fluid cell <em>in situ </em>under the low-dose imaging conditions closely resemble those obtained in solution syntheses, the reaction kinetics in the fluid cell is affected by the radiolysis of liquid reagents induced by the electron beam, altering the rate-determining reaction steps. We discuss details of the growth processes and propose the reaction mechanism in liquid phase <em>in situ</em>.</p>
dc.identifier archive/
dc.identifier.articleid 1341
dc.identifier.contextkey 14841018
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/338
dc.language.iso en
dc.relation.ispartofseries IS-J 9812
dc.source.bitstream archive/|||Fri Jan 14 23:39:55 UTC 2022
dc.source.uri 10.3389/fbioe.2019.00019
dc.subject.disciplines Biological Engineering
dc.subject.disciplines Biomechanical Engineering
dc.subject.disciplines Mechanics of Materials
dc.subject.disciplines Nanoscience and Nanotechnology
dc.subject.keywords bimetallic Au-Pd-Au core-shell nanostructures
dc.subject.keywords nanoparticle growth
dc.subject.keywords DNA-templated shell formation
dc.subject.keywords liquid phase STEM in situ
dc.subject.keywords dynamic analysis
dc.subject.keywords low-dose imaging
dc.title Direct Observation of Early Stages of Growth of Multilayered DNA-Templated Au-Pd-Au Core-Shell Nanoparticles in Liquid Phase
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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