Dr. Steven J. Limmer Profile

Dr. Steven J. Limmer

at Sandia National Labs

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Author

Publications (9)

Proceedings Article | 5 June 2014 Paper

Development of a downhole tool measuring real-time concentration of ionic tracers and pH in geothermal reservoirs

Ryan Hess, Timothy Boyle, Steven Limmer, William Yelton, Samuel Bingham, Greg Stillman, Scott Lindblom, Grzegorz Cieslewski

Proceedings Volume 9113, 91130J (2014) https://doi.org/10.1117/12.2051151

KEYWORDS: Electrodes, Sensors, Ions, Temperature metrology, Silver, Epoxies, Potassium, Liquids, Chemical analysis, Statistical analysis

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Proceedings Article | 14 October 2004 Paper

Synthesis and electrochromic property of single-crystalline V2O5 nanorod arrays by template-based deposition

Katsunori Takahashi, Steven Limmer, Ying Wang, Guozhong Cao

Proceedings Volume 5510, (2004) https://doi.org/10.1117/12.563104

KEYWORDS: Vanadium, Crystals, Sol-gels, Transmittance, Electrodes, Lithium, Oxides, Diffraction, Diffusion, Nanorods

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Proceedings Article | 24 November 2003 Paper

Ordered dye-functionalized TiO2 nanostructures for photoelectrochemical applications

Tammy Chou, Steven Limmer, Guozhong Cao

Proceedings Volume 5224, (2003) https://doi.org/10.1117/12.506074

KEYWORDS: Solar cells, Electrodes, Electrons, Nanostructures, Adsorption, Particles, Dye sensitized solar cells, Liquids, Photovoltaics, Nanorods

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Proceedings Article | 24 November 2003 Paper

Template-based growth of V2O5 nanorods by electrodeposition

Katsunori Takahashi, Steven Limmer, Guozhong Cao

Proceedings Volume 5224, (2003) https://doi.org/10.1117/12.507364

KEYWORDS: Vanadium, Crystals, Electrodes, Oxides, Nanoparticles, Absorption, Transmission electron microscopy, Ions, Absorbance, Nanorods

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Proceedings Article | 24 November 2003 Paper

Electrochromic and transparent conducting oxide nanorods

Steven Limmer, Katsunori Takahashi, Guozhong Cao

Proceedings Volume 5224, (2003) https://doi.org/10.1117/12.505864

KEYWORDS: Absorbance, Niobium, Oxides, Vanadium, Electrodes, Transparent conducting oxide, Glasses, Tin, Scanning electron microscopy, Nanorods

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Proceedings Article | 24 November 2003 Paper

Optically transparent superhydrophobic silica-based coatings

Mary Shang, Ying Wang, Steven Limmer, Tammy Chou, Guozhong Cao

Proceedings Volume 5224, (2003) https://doi.org/10.1117/12.524191

KEYWORDS: Optical coatings, Transmittance, Surface roughness, Silica, Chemistry, Atomic force microscopy, Silicon, Sol-gels, Solids, Glasses

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Proceedings Article | 4 November 2002 Paper

Formation and optical properties of cylindrical gold nanoshells on silica and titania nanorods

Steven Limmer, Tammy Chou, Guozhong Cao

Proceedings Volume 4809, (2002) https://doi.org/10.1117/12.451624

KEYWORDS: Gold, Absorbance, Optical properties, Particles, Silica, Oxides, Sol-gels, Electrodes, Spherical lenses, Nanorods

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Proceedings Article | 4 November 2002 Paper

Functionalized, hierarchically structured mesoporous silica by sol electrophoresis and self-assembly

Tammy Chou, Steven Limmer, Guozhong Cao

Proceedings Volume 4809, (2002) https://doi.org/10.1117/12.451652

KEYWORDS: Silica, Ions, Lead, Chromophores, Molecules, Molecular self-assembly, Absorption, Glasses, Silicon, Nanorods

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Dye-functionalized mesoporous silica has gained considerable attention for use in optical applications. Much interest into the tunable functionality of these small-scale optical materials has been the focus for possible use in lasers, light filters, sensors, solar cells, and photocatalysis. Extensive exploration into functionalizing mesoporous silica has been made using sol-gel methods for incorporating polymeric dyes within the pore channels of the silica network to modify optical properties. However, research so far has been focused on functionalization of mesoporous silica powders or films on dense substrates, limiting applications in practice because of the difficult accessibility of mesopores. In this paper, we studied the development of hierarchically-structured mesoporous silica with chromophore dye molecules covalently linked within the channel walls of pores for the selective adsorption and detection of specific ions and chemical compounds. Hierarchically-structured, unidirectionally-aligned mesoporous silica was synthesized within the pores of polycarbonate membranes by surfactant-assisted sol electrophoretic deposition. After the removal of surfactants from the mesopores, the inner surface of the mesopores was functionalized with silane-containing chromophore molecules through self-assembly. Full coverage of these dye molecules on the surface of the mesopores was anticipated due to the fact that these reactant chromophore molecules, in solution, migrate through the pores. The organic chromophore dye molecules, assembled onto the surface of the mesopores, would have the amino groups exposed to the surface. These groups would have the capability to selectively interact with ions or chemical compounds in solution, for instance lead ions in water. Hence, the absorption spectrum of the chromophore dye molecules attached to the mesopores of silica was altered after exposure to lead ions in solution. In addition, the ion concentration in solution also differed. Such functionalized, hierarchically-structured mesoporous silica would have applications such as membranes for removal of, and sensors for, detecting trace amounts of ions and chemical compounds in water and air.

Proceedings Article | 4 November 2002 Paper

Synthesis of CdWO4 films via sol-gel processing

Kirk Lennstrom, Steven Limmer, Guozhong Cao

Proceedings Volume 4809, (2002) https://doi.org/10.1117/12.451646

KEYWORDS: Crystals, Cadmium, Sol-gels, Luminescence, Particles, Thin films, Tungsten, Scanning electron microscopy, Quartz, X-ray diffraction

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Showing 5 of 9 publications

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