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Search Publications by: John Pettibone ()

Displaying 26 - 33 of 33

Surface mediated assembly of small, metastable gold nanoclusters

May 27, 2013

Author(s)

John M. Pettibone, William A. Osborn, Konrad Rykaczewski, Albert A. Talin, John E. Bonevich, Jeffrey W. Hudgens

The unique properties of metallic nanoclusters are attractive for numerous commercial and industrial applications but are generally less stable than nanocrystals. Thus, developing methodologies for stabilizing nanoclusters and retaining their enhanced

Discriminating the states of matter in metallic nanoparticle transformations: What are we missing?

February 20, 2013

Author(s)

John M. Pettibone, Julien C. Gigault, Vincent A. Hackley

A limiting factor in assessing the risk of current and emerging nanomaterials in biological and environmental systems is the ability to accurately detect and characterize their size, shape and composition in broad distributions and complex media

Nucleation products of ligated nanoclusters unaffected by temperature and reducing agent

August 27, 2012

Author(s)

John M. Pettibone, Nicole R. Reardon

Atomically uniform nucleation products of ligated metal nanoclusters are observed irrespective of reduction conditions for metal-bidentate ligand systems. Monodentate ligands are not reported to wield similar control, indicating steric contributions of

Reaction Network Governing Diphosphine-Protected Gold Nanocluster Formation from Nascent Cationic Platforms

February 16, 2012

Author(s)

John M. Pettibone, Jeffrey W. Hudgens

We identify the reaction network governing gold monolayer protected cluster (MPC) formation during the reduction of Au(PPh 3)Cl and L 5 (L 5 = 1,5-bis(diphenylphosphino)pentane) in solutions. UV-vis spectroscopy and electrospray ionization mass

Predictive Gold Nanocluster Formation Controlled by Metal-Ligand Complexes

January 9, 2012

Author(s)

John M. Pettibone, Jeffrey W. Hudgens

The formation of ligand-protected transition metal nanoclusters in size-selective syntheses is driven by the inherent properties of the protecting ligands. We have previously reported the selective, monodisperse product formation of phosphine protected Au

Reaction Mechanism Governing the Formation of 1,3-bis(diphenylphosphino)propane-protected Gold Nanoclusters

September 19, 2011

Author(s)

Jeffrey W. Hudgens, John M. Pettibone, Thomas P. Senftle, Ryan N. Bratton

This report outlines the determination of a reaction mechanism that can be manipulated to develop directed syntheses of gold monolayer protected clusters (MPCs) prepared by the reduction of solutions containing 1,3-bis(diphenylphosphino)propane (L 3)

Gold cluster formation with phosphine ligands: Etching as a synthetic pathway for size-selective small clusters?

March 7, 2011

Author(s)

John M. Pettibone, Jeffrey W. Hudgens

Triphenylphosphine (PPh3) is commonly used during syntheses of stable closed-shell monolayer protected clusters (MPCs). Models of transition metal (TM) cluster and nanoparticle syntheses commonly assign PPh3 a passive role as a chemical placeholder

Synthetic Approach for Tunable, Size-Selective Formation of Monodisperse, Diphosphine-Protected Gold Nanoclusters

August 10, 2010

Author(s)

John M. Pettibone, Jeffrey W. Hudgens

Most nanoparticle syntheses, including those based on the Brust-Schiffrin method, produce a mixture of different metal core sizes. This report presents a new strategy for controlling the size and dispersity of ultra-small nanoclusters through selection of

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