The Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloys

Handle URI:
http://hdl.handle.net/10754/553018
Title:
The Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloys
Authors:
LaGrow, Alec P.; Knudsen, Kristian; AlYami, Noktan; Anjum, Dalaver H.; Bakr, Osman M. ( 0000-0002-3428-1002 )
Abstract:
The characteristics of bimetallic nanomaterials are dictated by their size, shape and elemental distribution. Solution synthesis is widely utilized to form nanomaterials, such as nanoparticles, with controlled size and shape. However, the effects of variables on the characteristics of bimetallic nanomaterials are not completely understood. In this study, we used a continuous-flow synthetic strategy to explore the effects of the ligands and the oxidation state of a metal precursor in a shape-controlled synthesis on the final shape of the nanomaterials and the elemental distribution within the alloy. We demonstrate that this strategy can tune the size of monodisperse PtM (M=Ni or Cu) alloy nanocrystals ranging from 3 to 16 nm with an octahedral shape using acetylacetonate or halide precursors of Pt(II), Pt(IV) and Ni or Cu (II). The nanoparticles formed from halide precursors showed an enrichment of platinum on their surfaces, and the bromides could oxidatively etch the nanoparticles during synthesis with the O2/Br- pair. The two nanocrystal precursors can be uti-lized independently and can control the size with a trend of Pt(acac)2<PtCl2<PtCl4<PtBr2<PtBr4 and M(acac)2<MCl2<MBr2 for the secondary metal (copper or nickel). These results open up avenues to understand the effect of the ligand shell of a precursor during the synthesis of alloy nanoparticles as well as to control, in a scalable manner, the nanomaterial size and surface chemistry.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center; Advanced Nanofabrication, Imaging and Characterization Core Lab
Citation:
The Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloys 2015:150512112359001 Chemistry of Materials
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
12-May-2015
DOI:
10.1021/acs.chemmater.5b01247
Type:
Article
ISSN:
0897-4756; 1520-5002
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.5b01247
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorLaGrow, Alec P.en
dc.contributor.authorKnudsen, Kristianen
dc.contributor.authorAlYami, Noktanen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorBakr, Osman M.en
dc.date.accessioned2015-05-17T20:42:41Zen
dc.date.available2015-05-17T20:42:41Zen
dc.date.issued2015-05-12en
dc.identifier.citationThe Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloys 2015:150512112359001 Chemistry of Materialsen
dc.identifier.issn0897-4756en
dc.identifier.issn1520-5002en
dc.identifier.doi10.1021/acs.chemmater.5b01247en
dc.identifier.urihttp://hdl.handle.net/10754/553018en
dc.description.abstractThe characteristics of bimetallic nanomaterials are dictated by their size, shape and elemental distribution. Solution synthesis is widely utilized to form nanomaterials, such as nanoparticles, with controlled size and shape. However, the effects of variables on the characteristics of bimetallic nanomaterials are not completely understood. In this study, we used a continuous-flow synthetic strategy to explore the effects of the ligands and the oxidation state of a metal precursor in a shape-controlled synthesis on the final shape of the nanomaterials and the elemental distribution within the alloy. We demonstrate that this strategy can tune the size of monodisperse PtM (M=Ni or Cu) alloy nanocrystals ranging from 3 to 16 nm with an octahedral shape using acetylacetonate or halide precursors of Pt(II), Pt(IV) and Ni or Cu (II). The nanoparticles formed from halide precursors showed an enrichment of platinum on their surfaces, and the bromides could oxidatively etch the nanoparticles during synthesis with the O2/Br- pair. The two nanocrystal precursors can be uti-lized independently and can control the size with a trend of Pt(acac)2<PtCl2<PtCl4<PtBr2<PtBr4 and M(acac)2<MCl2<MBr2 for the secondary metal (copper or nickel). These results open up avenues to understand the effect of the ligand shell of a precursor during the synthesis of alloy nanoparticles as well as to control, in a scalable manner, the nanomaterial size and surface chemistry.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acs.chemmater.5b01247en
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.5b01247.en
dc.titleThe Effect of Precursor Ligands and Oxidation State in the Synthesis of Bimetallic Nano-Alloysen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Centeren
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.identifier.journalChemistry of Materialsen
dc.eprint.versionPost-printen
kaust.authorAnjum, Dalaver H.en
kaust.authorBakr, Osman M.en
kaust.authorLaGrow, Alec P.en
kaust.authorKnudsen, Kristianen
kaust.authorAlYami, Noktanen
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