Junwei Wang

Works (9)

Updated: July 20th, 2023 21:15

2012 journal article

Bulky Adamantanethiolate and Cyclohexanethiolate Ligands Favor Smaller Gold Nanoparticles with Altered Discrete Sizes

ACS NANO, 6(6), 4903–4911.

By: P. Krommenhoek n, J. Wang*, N. Hentz*, A. Johnston-Peck, K. Kozek, G. Kalyuzhny*, J. Tracy* 

Contributors: P. Krommenhoek n, J. Wang*, N. Hentz*, A. Johnston-Peck, K. Kozek, G. Kalyuzhny*, J. Tracy* 

author keywords: steric effects; bulky ligands; magic sizes; discrete sizes; clusters; gold; thiol
MeSH headings : Adamantane; Crystallization / methods; Cyclohexanes / chemistry; Gold / chemistry; Ligands; Macromolecular Substances / chemistry; Materials Testing; Molecular Conformation; Nanoparticles / chemistry; Nanoparticles / ultrastructure; Particle Size; Sulfhydryl Compounds / chemistry; Surface Properties
TL;DR: Use of bulky ligands in the synthesis of metal nanoparticles (NPs) gives smaller core sizes, sharpens the size distribution, and alters the discrete sizes, which may also lead to the discovery of new discrete sizes in other systems. (via Semantic Scholar)
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Sources: Web Of Science, ORCID
Added: August 6, 2018

2011 journal article

Effects of Ligand Monolayers on Catalytic Nickel Nanoparticles for Synthesizing Vertically Aligned Carbon Nanofibers

ACS APPLIED MATERIALS & INTERFACES, 3(4), 936–940.

By: M. Sarac  n, R. Wilson n, A. Johnston-Peck n, J. Wang n, R. Pearce n, K. Klein *, A. Melechko n, J. Tracy n 

Contributors: M. Sarac  n, R. Wilson n, A. Johnston-Peck n, J. Wang n, R. Pearce n, K. Klein *, A. Melechko n, J. Tracy n 

author keywords: carbon nanofibers; nanoparticles; nickel; chemical vapor deposition; catalyst; ligand
TL;DR: Vertically aligned carbon nanofibers were synthesized using ligand-stabilized Ni nanoparticle catalysts and plasma-enhanced chemical vapor deposition to enable facile preparation of VACNF arrays with monodisperse diameters below the size limit of thin film lithography. (via Semantic Scholar)
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Sources: Web Of Science, ORCID
Added: August 6, 2018

2011 journal article

Formation and Grain Analysis of Spin-Cast Magnetic Nanoparticle Monolayers

LANGMUIR, 27(8), 5040–5046.

By: A. Johnston-Peck n, J. Wang n & J. Tracy n 

Contributors: A. Johnston-Peck n, J. Wang n & J. Tracy n 

TL;DR: Computer-aided analysis of the arrays elucidates their grain structures, including identification of the grain boundaries and defects and measurements of thegrain orientations and translational correlation lengths. (via Semantic Scholar)
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Sources: Web Of Science, ORCID
Added: August 6, 2018

2011 journal article

Sinter-free phase conversion and scanning transmission electron microscopy of FePt nanoparticle monolayers

NANOSCALE, 3(10), 4142–4149.

By: A. Johnston-Peck n, G. Scarel n, J. Wang n, G. Parsons n  & J. Tracy n 

Contributors: A. Johnston-Peck n, G. Scarel n, J. Wang n, G. Parsons n  & J. Tracy n 

MeSH headings : Aluminum Oxide / chemistry; Iron / chemistry; Magnetics; Metal Nanoparticles / chemistry; Metal Nanoparticles / ultrastructure; Microscopy, Electron, Scanning Transmission; Particle Size; Platinum / chemistry; Temperature
TL;DR: Electron and X-ray diffraction in conjunction with high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) show that as-synthesized A1 FePt NPs convert into L1(0) and L1 (2) phase NPs through annealing, highlighting the need for improved control over the compositional uniformity of FePT NPs for their use in bit-patterned magnetic recording. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 article

Effect of rolling temperature on the evolution of defects and properties of an Al-Cu alloy

Sarma, V. S., Jian, W. W., Wang, J., Conrad, H., & Zhu, Y. T. (2010, September). JOURNAL OF MATERIALS SCIENCE, Vol. 45, pp. 4846–4850.

By: V. Sarma  n, W. Jian n, J. Wang n, H. Conrad n & Y. Zhu n 

Contributors: V. Sarma  n, W. Jian n, J. Wang n, H. Conrad n & Y. Zhu n 

Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Size-Dependent Nanoscale Kirkendall Effect During the Oxidation of Nickel Nanoparticles

ACS NANO, 4(4), 1913–1920.

By: J. Railsback n, A. Johnston-Peck n, J. Wang n & J. Tracy n 

Contributors: J. Railsback n, A. Johnston Peck n, J. Wang n & J. Tracy n 

author keywords: Kirkendall effect; nanoparticle; nickel; nickel oxide; hollow nanoparticles; diffusion
TL;DR: By choosing an intermediate oxidation temperature and varying the reaction time, partially oxidized Ni(core)/NiO(shell) NPs can be synthesized with good control and have distinct nanostructures. (via Semantic Scholar)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2010 journal article

Synthesis of Au(Core)/Ag(Shell) Nanoparticles and their Conversion to AuAg Alloy Nanoparticles

SMALL, 7(2), 230–234.

By: M. Shore n, J. Wang n, A. Johnston-Peck n, A. Oldenburg * & J. Tracy n 

Contributors: M. Shore n, J. Wang n, A. Johnston-Peck n, A. Oldenburg * & J. Tracy n 

MeSH headings : Alloys / chemistry; Gold / chemistry; Metal Nanoparticles / chemistry; Silver / chemistry
TL;DR: A facile, stoichiometrically controlled synthesis of Au(core)/Ag(shell) and AuAg alloy NPs through digestive ripening is reported, which is a potentially general method for synthesizing Alloy NPs. (via Semantic Scholar)
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2009 journal article

Nickel Phosphide Nanoparticles with Hollow, Solid, and Amorphous Structures

CHEMISTRY OF MATERIALS, 21(19), 4462–4467.

By: J. Wang n, A. Johnston-Peck n & J. Tracy n 

Contributors: J. Wang n, A. Johnston Peck n & J. Tracy n 

Sources: Web Of Science, ORCID
Added: August 6, 2018

2009 journal article

Synthesis and Structural and Magnetic Characterization of Ni(Core)/NiO(Shell) Nanoparticles

ACS NANO, 3(5), 1077–1084.

By: A. Johnston-Peck n, J. Wang n & J. Tracy n 

Contributors: A. Johnston Peck n, J. Wang n & J. Tracy n 

author keywords: magnetic nanoparticles; exchange bias; nickel; nickel oxide; superparamagnetism; magnetic anisotropy
MeSH headings : Crystallization / methods; Macromolecular Substances / chemistry; Magnetics; Materials Testing; Molecular Conformation; Nanostructures / chemistry; Nanostructures / ultrastructure; Nanotechnology / methods; Nickel / chemistry; Particle Size; Surface Properties
TL;DR: A size series of ligand-stabilized Ni nanoparticles (NPs) with diameters between 8-24 nm was prepared by solution chemistry, followed by solution-phase oxidation with atmospheric oxygen at 200 degrees C to form Ni(core)/NiO(shell) NPs with shell thicknesses of 2-3 nm. (via Semantic Scholar)
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Sources: Web Of Science, ORCID
Added: August 6, 2018

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