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- W799542024 abstract "Tailoring Local Conductivity by the Formation of Ag Nanoparticles in SiO2 Xerogel Films By Ricky J. Caperton, Jr. A thesis submitted in partial fulfillment of the requirements of the degree of Master of Science at. Virginia Commonwealth University, 2009. Major Director: Massimo F. Bertino, Associate Professor, Department of Physics Porous silicon dioxide thin films were produced via dip-coating and doped with Ag by adding AgNO3 to the dipping solution. Nanoparticles were formed within the pores of these films by UV exposure. Nanoparticle formation was confirmed by UV-visible spectroscopy and Transmission Electron Microscopy (TEM). Conductive Atomic Force Microscopy (CAFM) showed that the conductivity of the films decreased upon exposure to UV. This decrease in the conductivity is most likely due to the clustering of charge carriers. Initially, Ag ions are attached to negatively charged pore walls in a dense packing network. Upon UV exposure (125 mW @ 266 nm), the Ag ions are reduced to Ag metal and agglomerate to form clusters. The agglomeration creates gaps in the film that decrease its conductivity. This ability to tune film conductivity was used to create insulating patterns within conducting films. A calibration mask was placed over the films during UV exposure, and exposed regions with a minimum width of ~2 μm were detected as depressions with insulating behavior. The fabrication of photonic and plasmonic devices is being explored using this method." @default.
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- W799542024 date "2009-01-01" @default.
- W799542024 modified "2023-09-23" @default.
- W799542024 title "Tailoring Local Conductivity by the Formation of Ag Nanoclusters in SiO2 Xerogel Films" @default.
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- W799542024 doi "https://doi.org/10.25772/e7kc-1a79" @default.
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