Localized surface plasmon sensing based investigation of nanoscale metal oxidation kinetics

Journal Article · Mon Apr 27 04:00:00 EDT 2015 · Nanotechnology

DOI:https://doi.org/10.1088/0957-4484/26/20/205701· OSTI ID:1362211

Malasi, A. ^[1]; Sachan, R. ^[2]; Ramos, V. ^[3]; Garcia, H. ^[4]; Duscher, G. ^[2]; Kalyanaraman, R. ^[5]

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1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering
2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Material Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Material Science and Engineering
4. Southern Illinois Univ., Edwardsville, IL (United States). Dept. of Physics
5. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering and Dept. of Material Science and Engineering

The localized surface plasmon resonance (LSPR) of nanoparticles can be a powerful and sensitive probe of chemical changes in nanoscale volumes. We used the LSPR of silver (Ag) to study the oxidation kinetics of nanoscopic volumes of cobalt (Co) metal. Bimetal nanoparticles of the immiscible Co-Ag system prepared by pulsed laser dewetting were aged in ambient air and the resulting changes to the LSPR signal and bandwidth were used to probe the oxidation kinetics. We found that Co preferentially oxidizes first. This resulted in a significant enhancement by a factor of 8 or more in the lifetime of stable Ag plasmons over that of pure Ag. Furthermore, theoretical modeling based on optical mean field approximation was able to predict the oxidation lifetimes and could help design stable Ag-based plasmonic nanoparticles for sensing applications.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1362211
• Journal Information: Nanotechnology, Journal Name: Nanotechnology Journal Issue: 20 Vol. 26; ISSN 0957-4484
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English

Related Subjects

2-COMPONENT COMPOSITE
36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
COBALT
ENHANCED RAMAN-SCATTERING
NANOSTRUCTURES
OXIDE
SENSOR
SILVER NANOPARTICLES
SIZE-DEPENDENCE
SPECTROSCOPY
TEMPERATURE
bimetal
cobalt
kinetics
localized surface plasmons
oxidation
silver