@article{losego_efremenko_rhodes_cerruti_franzen_maria_2009, title={Conductive oxide thin films: Model systems for understanding and controlling surface plasmon resonance}, volume={106}, number={2}, journal={Journal of Applied Physics}, author={Losego, M. D. and Efremenko, A. Y. and Rhodes, C. L. and Cerruti, M. G. and Franzen, S. and Maria, J. P.}, year={2009} } @article{franzen_rhodes_cerruti_gerber_losego_maria_aspnes_2009, title={Plasmonic phenomena in indium tin oxide and ITO-Au hybrid films}, volume={34}, ISSN={["1539-4794"]}, DOI={10.1364/OL.34.002867}, abstractNote={The observation of surface-plasmon resonances in indium tin oxide (ITO) thin films is complemented with the effects of hybrid ITO/Au conducting layers where charge densities can be tuned. Where carrier densities are similar (ITO and nanoparticle Au), the plasmonic behavior is that of a monolithic ITO thin film. Where the carrier density of one layer is much greater than that of the other (ITO and Au metal), boundary conditions lead to cancelation of the surface plasmon. In the latter case a capacitivelike plasmon resonance is observed for sufficiently thin films.}, number={18}, journal={OPTICS LETTERS}, author={Franzen, Stefan and Rhodes, Crissy and Cerruti, Marta and Gerber, Ralph W. and Losego, Mark and Maria, Jon-Paul and Aspnes, D. E.}, year={2009}, month={Sep}, pages={2867–2869} } @article{rhodes_cerruti_efremenko_losego_aspnes_maria_franzen_2008, title={Dependence of plasmon polaritons on the thickness of indium tin oxide thin films}, volume={103}, number={9}, journal={Journal of Applied Physics}, author={Rhodes, C. and Cerruti, M. and Efremenko, A. and Losego, M. and Aspnes, D. E. and Maria, J. P. and Franzen, S.}, year={2008} } @article{leonard_cerruti_duscher_franzen_2008, title={Interfacial and solvent effects govern the formation of tris(dibenzylidenacetone)dipalladium(0) microstructures}, volume={24}, ISSN={["0743-7463"]}, DOI={10.1021/la801039j}, abstractNote={Organometallic palladium adducts have application as catalysts and as precursors for nanoparticle synthesis. Herein, we study the spontaneous formation of molecular crystals of the organometallic reagent tris(dibenzylidenacetone)dipalladium(0) (Pd(2)(DBA)(3)) in THF/H(2)O binary solvent systems. We report structural and chemical characterization of the resulting diverse structures with shapes including hexagonal platelets, rods, cubes, and stars. Optical microscopy, transmission electron microscopy, scanning electron microscopy, and energy-dispersive spectroscopy were used to determine representative structures and corresponding compositions when formed either in a binary solution or upon evaporation on a surface. The difference in Pd(2)(DBA)(3) particle morphology was attributed to differences in the surface tension of growing crystalline faces. The formation of a majority of rods or hexagonal platelets in solution was shown to be determined by the ratio of THF to H(2)O in the solvent, whereas supersaturation effects and interfacial surface tension played a major role in creating the shape of particles formed upon evaporation of Pd(2)(DBA)(3) droplets on a surface.}, number={15}, journal={LANGMUIR}, author={Leonard, Donovan N. and Cerruti, Marta and Duscher, Gerd and Franzen, Stefan}, year={2008}, month={Aug}, pages={7803–7809} } @article{cerruti_fissolo_carraro_ricciardi_majumdar_maboudian_2008, title={Poly(ethylene glycol) monolayer formation and stability on gold and silicon nitride substrates}, volume={24}, ISSN={["0743-7463"]}, DOI={10.1021/la801357v}, abstractNote={Poly(ethylene glycol) (PEG) self-assembled monolayers (SAMs) are extensively used to modify substrates to prevent nonspecific protein adsorption and to increase hydrophilicity. X-ray photoelectron spectroscopy analysis, complemented by water contact angle measurements, is employed to investigate the formation and stability upon aging and heating of PEG monolayers formed on gold and silicon nitride substrates. In particular, thiolated PEG monolayers on gold, with and without the addition of an undecylic spacer chain, and PEG monolayers formed with oxysilane precursors on silicon nitride have been probed. It is found that PEG-thiol SAMs are degraded after less than two weeks of exposure to air and when heated at temperatures as low as 120 degrees C. On the contrary, PEG-silane SAMs are stable for more than two weeks, and fewer molecules are desorbed even after two months of aging, compared to those desorbed in two weeks from the PEG-thiol SAMs. A strongly bound hydration layer is found on PEG-silane SAMs aged for two months. Heating PEG-silane SAMs to temperatures as high as 160 degrees C improves the quality of the monolayer, desorbing weakly bound contaminants. The differences in stability between PEG-thiol SAMs and PEG-silane SAMs are ascribed to the different types of bonding to the surface and to the fact that the thiol-Au bond can be easily oxidized, thus causing desorption of PEG molecules from the surface.}, number={19}, journal={LANGMUIR}, author={Cerruti, Marta and Fissolo, Stefano and Carraro, Carlo and Ricciardi, Carlo and Majumdar, Arun and Maboudian, Roya}, year={2008}, month={Oct}, pages={10646–10653} } @article{cerruti_rhodes_losego_efremenko_maria_fischer_franzen_genzer_2007, title={Influence of indium-tin oxide surface structure on the ordering and coverage of carboxylic acid and thiol monolayers}, volume={40}, ISSN={["1361-6463"]}, DOI={10.1088/0022-3727/40/14/016}, abstractNote={This paper analyses the variability of self-assembled monolayers (SAMs) formation on ITO depending on the substrate surface features. In particular, we report on the formation of carboxylic acid- and thiol-based SAMs on two lots of commercially prepared indium–tin oxide (ITO) thin films. Contact angle measurements, electrochemical experiments, and near-edge x-ray absorption fine structure (NEXAFS) spectroscopy showed that the quality of monolayers formed differed substantially between the two ITO batches. Only one of the two ITO substrates was capable of forming well-organized thiol- and carboxylic acid-based SAMs. In order to rationalize these observations, atomic force microscopy and x-ray diffraction analyses were carried out, and SAMs were prepared on ITO substrates fabricated by sputtering in our laboratories. An attempt was made to influence the film microstructure and surface morphology by varying substrate temperatures during ITO deposition. Good-quality thiol and carboxylic acid SAMs were obtained on one of the ITO substrates prepared in-house. While our characterization could not single out conclusively one specific parameter in ITO surface structure that could be responsible for good SAMs formation, we could point out homogeneous surface morphology as a relevant factor for the quality of the SAMs. Evidence was also found for ITO crystallographic orientation to be a parameter influencing SAMs organization.}, number={14}, journal={JOURNAL OF PHYSICS D-APPLIED PHYSICS}, author={Cerruti, Marta and Rhodes, Crissy and Losego, Mark and Efremenko, Alina and Maria, Jon-Paul and Fischer, Daniel and Franzen, Stefan and Genzer, Jan}, year={2007}, month={Jul}, pages={4212–4221} } @article{franzen_cerruti_leonard_duscher_2007, title={The role of selection pressure in RNA-mediated evolutionary materials synthesis}, volume={129}, ISSN={["0002-7863"]}, DOI={10.1021/ja076054r}, abstractNote={Evolutionary materials synthesis is a provocative concept that has the potential for the discovery of novel compounds ranging from drugs to inorganic materials. RNA-mediated evolutionary materials synthesis requires aqueous solvent of moderate ionic strength, water-soluble precursors, and an appropriately designed selection pressure. Throughout the selection process, the RNA must be folded, stable, and accessible once it has bound to a target, catalyzed a chemical reaction, or templated formation of a structure. Subsequently, the RNA must be accessible to permit reverse transcriptase to create DNA copies for amplification. A well-designed selection will generate RNAs that can favor growth of a particular crystal habit or catalyze a specific reaction pathway. In this study we rigorously test the assumptions, procedures, and results of the only published example of an RNA-mediated evolutionary materials synthesis. The proof that a particular RNA sequence is responsible for a novel material synthesis must be established by control experiments as outlined in the present study. Furthermore, the product of nanoscale synthesis must be studied using state-of-the-art characterization methods to determine that selection pressure is exerted according to design. Herein, we demonstrate the use of advanced electron microscopy to determine chemical composition and structure as a critical step in analysis of the success of a selection. We conclude that RNA selections should not be carried out in binary solvent systems, such as tetrahydrofuran (THF) and water. A specific example, which is not consistent with rigorous selection of functional RNAs or RNA cognates, is provided by the precipitation of the water-insoluble precursor, tris(dibenzylideneacetone) dipalladium(0) Pd2(DBA)3.}, number={49}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Franzen, Stefan and Cerruti, Marta and Leonard, Donovan N. and Duscher, Gerd}, year={2007}, month={Dec}, pages={15340–15346} } @article{cerruti_sauthier_leonard_liu_duscher_feldheim_franzen_2006, title={Gold and silica-coated gold nanoparticles as thermographic labels for DNA detection}, volume={78}, ISSN={["1520-6882"]}, DOI={10.1021/ac0600555}, abstractNote={The infrared emissivity of Au and silica-coated Au nanoparticles (Au NPs) deposited on indium tin oxide substrates was investigated. NPs were irradiated with laser light at a frequency close to the Au plasmon resonance band, and the blackbody radiation emitted as a result was monitored with an IR camera equipped with an InAs array detector. The differences in temperature before and after laser irradiation were recorded (T-jumps) and were found to be directly proportional to the number of particles present on the slide and to the laser power used in the experiment. Coating Au NPs with silica increased the measured T-jumps 2-5 times, depending on the thickness of the silica shell. This was in agreement with the observation that silica has a much higher IR emissivity than Au. Both Au and silica-coated Au NPs were then tested as labels for thermographic DNA detection. Target DNA concentrations as low as 100 pM were recorded when Au NPs were used as labels and as low as 10 pM when silica-coated Au NPs were used.}, number={10}, journal={ANALYTICAL CHEMISTRY}, author={Cerruti, Marta G. and Sauthier, Marc and Leonard, Donovan and Liu, Dage and Duscher, Gerard and Feldheim, Daniel L. and Franzen, Stefan}, year={2006}, month={May}, pages={3282–3288} } @misc{cerruti_sahai_2006, title={Silicate biomaterials for orthopaedic and dental implants}, volume={64}, journal={Medical mineraology and geochemistry}, publisher={Chantilly: Mineralogical Soc America}, author={Cerruti, M. and Sahai, N.}, year={2006}, pages={283–313} }