Keywords and Phrases
Chemical etching; Ion-solid interaction; Nuclear materials; Plasmon-phonon coupling; Quartz; Raman spectroscopy
”This study addresses the experimental methods used to develop and characterize plasmonic devices capable of modifying the optical response of alpha quartz via the deposition of gold nanoparticles in etched ion tracks. In the first part of the research, the microstructural characterization of latent and etched ion tracks produced in alpha quartz (α-SiO2) is presented. Single crystals of α-SiO2 were irradiated with two highly energetic ions to different nominal fluences. As expected, the morphology of the resulting ion tracks depends on the energy of the incident ion and their stopping powers within the target material. Subsequent chemical vapor-etching was conducted to create nanowells in the crystal structure. The etching process resulted in facetted nanowells, whose superficial dimensions increased with etching times and etchant concentrations. It was found that the etching rate is highly dependent on crystal orientation. Additionally, Raman spectroscopic analysis of the phonon confinement effect and strain due to the ion tracks is presented. Results show that the optical phonon modes undergo a shift towards higher frequencies while broadening asymmetrically compared to the unirradiated samples due to phonon confinement effects. In the second part of the research, the deposition of gold nanoparticles inside of the nanowells was conducted. The modification of the optical response of quartz by depositing gold nanoparticles in the nanowells is discussed. An increase in the Raman intensity was observed thanks to the enhancement of the electromagnetic field produced by localized surface plasmons at the surface of the gold nanoparticles. The deposition of nanoparticles in etched ion tracks in fused silica was also achieved and is also briefly discussed”--Abstract, page iv.
Graham, Joseph T.
Castano Giraldo, Carlos Henry
Schlegel, Joshua P.
Crespillo, Miguel L.
Brow, Richard K
Nuclear Engineering and Radiation Science
Ph. D. in Nuclear Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Anisotropic nanowell formation by vapor etching of ion tracks generated by high electronic excitation in α -quartz
- Raman characterization of phonon confinement and strain effects from latent ion tracks in α -quartz
- Enhancement of plasmon-phonon coupling in etched ion tracks in α-quartz
xii, 124 pages
© 2020 Maria Camila Garcia Toro, All rights reserved.
Dissertation - Open Access
Garcia Toro, Maria C., "Modification of the optical response of alpha quartz via the deposition of gold nanoparticles in etched ion tracks" (2020). Doctoral Dissertations. 2941.