Controlling the properties of silver nanoparticles deposited on surfaces using supercritical carbon dioxide for surface-enhanced Raman spectroscopy |
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Authors: | Michael J Casciato Galit Levitin Dennis W Hess and Martha A Grover |
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Institution: | (1) School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA |
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Abstract: | Silver nanoparticles (AgNPs) have been deposited on silicon and glass surfaces via a supercritical carbon dioxide (sc-CO2) synthesis route for application in surface-enhanced Raman spectroscopy (SERS). Arrhenius plots revealed that nucleation
and growth processes in this system depend on both temperature and surface chemistry. Results also demonstrated that temperature
and surface chemistry could be varied to control nanoparticle properties, such as the mean nanoparticle size, density, and
surface coverage, providing two useful variables for manipulating the properties of AgNPs deposited on surfaces in this system.
These data also provide scientific insight into the underlying mechanisms governing heterogeneous AgNP deposition on a substrate
in a sc-CO2 system in addition to engineering insight into the variables that can be used to manipulate AgNP characteristics. The mean
particle size could be tuned over the range 20–200 nm, the interparticle distance could be tuned over the range 70 nm–1 μm,
and the surface coverage could be tuned over the range 0.035–0.58. Products were analyzed by scanning electron microscopy
with image analysis, transmission electron microscopy, X-ray diffraction, and SERS. The silver nanoparticle-coated substrates
were successfully applied in SERS, detecting the model analyte Rhodamine 6G at a concentration of 1 μM, a three orders of
magnitude improvement over SERS surfaces previously fabricated in sc-CO2 systems. Such surfaces can find use in trace concentration analyte detection in biomedical, chemical, and environmental applications. |
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