Journal article
Dealloying of Noble-Metal Alloy Nanoparticles
Nano letters, v 14(5), pp 2569-2577
01 May 2014
PMID: 24689459
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Dealloying is currently used to tailor the morphology and composition of nanoparticles and bulk solids for a variety of applications including catalysis, energy storage, sensing, actuation, supercapacitors, and radiation damage resistant materials. The known morphologies, which evolve on dealloying of nanoparticles, include core shell, hollow core-shell, and porous nanoparticles. Here we present results examining the fixed voltage dealloying of AgAu alloy particles in the size range of 2-6 and 20-55 nm. High-angle annular dark-field scanning transmission electron microcopy, energy dispersive, and electron energy loss spectroscopy are used to characterize the size, morphology, and composition of the dealloyed nanoparticles. Our results demonstrate that above the potential corresponding to Ag+/Ag equilibrium only core-shell structures evolve in the 2-6 nm diameter particles. Dealloying of the 20-55 nm particles results and in the formation of porous structures analogous to the behavior observed for the corresponding bulk alloy. A statistical analysis that includes the composition and particle size distributions characterizing the larger particles demonstrates that the formation of porous nanoparticles occurs at a well-defined thermodynamic critical potential.
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Details
- Title
- Dealloying of Noble-Metal Alloy Nanoparticles
- Creators
- Xiaoqian Li - Arizona State Univ, Ira A Fulton Sch Engn, Tempe, AZ 85287 USAQing Chen - Arizona State Univ, Ira A Fulton Sch Engn, Tempe, AZ 85287 USAIan McCue - Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USAJoshua Snyder - Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USAPeter Crozier - Arizona State Univ, Ira A Fulton Sch Engn, Tempe, AZ 85287 USAJonah Erlebacher - Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USAKarl Sieradzki - Arizona State Univ, Ira A Fulton Sch Engn, Tempe, AZ 85287 USA
- Publication Details
- Nano letters, v 14(5), pp 2569-2577
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Grant note
- 0855969 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) DMR-1003901; DMR-0855969 / NSF; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000336074800052
- Scopus ID
- 2-s2.0-84900489587
- Other Identifier
- 991019296565404721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied
- Physics, Condensed Matter