RESULTADOS DE INVESTIGACIONES .Bernard, Dowben Peter A. 8 Franck-Condon Coupling in Anthracene Isomer

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  • Universidad de Puerto Rico en Humacao Departamento de Fsica y Electrnica

    Segundo Semestre 2010-2011

    Nmero 6

    RESULTADOS DE INVESTIGACIONES SUBGRADUADA REALIZADA EN LOS CURSOS FISI 4161-64

  • Tabla de Contenido

    Tunable Schottky diodes fabricated from electrospun crossed SnO2 /PEDOT PSSA nanoribbons. Katherine V. Carrasquillo Mentor: Nicholas J. Pinto

    4

    Schottky diodes and sensors fabricated from electrospun PEDOT-PSSA nanofibers and their characterization in toxic gaseous environments. Yarely Dvila, Danair Rivera Mentor: Nicholas J. Pinto

    4

    Fabrication and electrical characterization of Semiconducting ZnO thinfilms and nanofibers. Yarely C. Dvila, Joshua Robles Mentors: Nicholas J. Pinto and Idalia Ramos

    5

    Study of nanofiber formation by injecting aqueos solutions containing polyethylene oxide and fluorescent latex beads inside electric fields. Jorge L. Castro Torre, Steven Arroyo Rivera Mentor: Rogerio Furlan

    5

    Oriented micro and nanofibers containing polyethylene oxide and pectin. Gerardo Gonzlez Rodrguez Mentor: Rogerio Furlan

    6

    Definition of polymeric structures using an atomic force microscope. Godohaldo J. Prez Medina, Mentor: Rogerio Furlan

    7

    Observation Report 2008, Humacao University Observatory. D. Centeno, L. Rivera-Rivera, E, Franco, V. Maldonado, K. Morales, M. De Jess, R. A. Rodrguez, A. J. Sosa, M. Rosario Mentor: Rafael J. Muller, Juan C Cersosimo

    8

    Lock and Key Adsorption Chemistry: Preferential Absorption of an Isomer of Di-iodobenzene on Molecular Films of Quinonoid Zwitterions. Zhang, Zhengzheng, Alvira Jose, Barbosa Xenia Mentor: Luis G. Rosa, Routaboul Lucie, Braunstein Pierre, Doudin Bernard, Dowben Peter A.

    8

    Franck-Condon Coupling in Anthracene Isomer Self-Assembled Layers and Symmetry Ef-fects on the High Resolution Ultraviolet Photoemission Spectra. Jiang Jinyue, Wong Freddy Li, Xiao Jie, Utreras Emmanuel, Lima Ocelio, Alvira Jose, Losovyj Ya. B., Tan Li Mentor: Luis G. Rosa

    9

    Selective nanoshaving of self-assembled monolayers of 2-(4-pyridylethyl)triethoxysilane. Jiang Jinyue, Lima Ocelio V., Xiao Jie, Utreras Emmanuel, Dowben PA, Tan Li. Mentor: Luis G. Rosa

    9

    UPRH Revlida Campeonato en The Great Moon Buggy Race 2011. Jos A. Tirado, Iro Garca, Luis Rivera, Francisco Serrano, Chary Molero, Ivn Ortiz. Mentor: Abraham Ruiz

    10

    RESULTADOS DE INVESTIGACIONES SUBGRADUADA REALIZADA EN LOS CURSOS FISI 4161-64

    Page 2 Nmero 6

  • Nmero 6 Page 3 RESULTADOS DE INVESTIGACIONES SUBGRADUADA REALIZADA EN LOS CURSOS FISI 4161-64

    The kinematics of the Ionized Hydrogen in NGC 3372. Grace M. Fontnez Santana, Milennys Velzquez Flores, Clarissa Vzquez Coln, Milzaida Merced Sanabria. Mentor: Juan C. Cersosimo

    11-12

    Engineering of Hybrid Organic-Inorganic Solar Cells. Melissa Dvila Santana, Earl Goodwin, David Kim, Damielle Reifsnyder. Mentor: Josee Vedrine-Pauleus, Chris B. Murray and Cherie Kagan

    12

    Preparation of AlN nanofibers using Electrospinning. Xenia Barbosa. Mentor: Idalia Ramos, Eva Campo, Jorge Santiago-Avils

    13

    Study of Gallium Nitride Nanofibers using Transmission Electron Microscopy. Joshua L. Robles Garca, Lytzamed Santa, Anamaris Melndez. Mentor: Idalia Ramos, Eva Campo

    14

    Temperature dependence of the electrical conductivity of Sb-SnO2 nanofibers. Maritza Reyna. Mentor: Idalia Ramos, Nicholas J. Pinto

    15

    Electrospun Polymer/Carbon Nanotubes Nanocomposites for Photoactuation. Sabrina Rosa, Jean P. Crespo. Mentor: Idalia Ramos, Eva Campo

    16

    Thermal analysis study of polysterene-poly(methyl methacrylate) (PS-PMMA) diblock copolymer thin films morphologies when annealed and sheared under vacuum in inert atmosphere. Luis Pomales, Melissa Davila-Santana, Omar Vega, Mirna Rivera-Claudio. Mentor: Josee Vedrine-Pauleus

    17

    A Computational Simulation of a Radiotherapy Clinic Procedure: Total Body Irradiation. Veronica de la Rosa Mentor: Ernesto P. Esteban

    18

    Geometric Properties of Magnetized Kerr Black Holes Ergosurface and Event Horizons. John P. Coln Cordova Mentor: Ernesto P. Esteban

    18-19

    On the Carcinogenic Effects of Space Radiation on the International Stations Crew. Pierina Agosto Mentor: Ernesto P. Esteban

    19

  • Nmero 6

    p-doped conducting polymer PEDOT-PSSA is also stable in air and is widely used in flexible devices. We shall report on the electrospinning technique to fabricate in air Schottky diodes, by simply crossing n-doped SnO2 and p-doped PEDOT-PSSA nanoribbons. The device parameters could be tuned by a back gate bias and by shining UV light. The diode parameters were calculated using the standard thermionic emission model of a Schottky and was tested as a half wave rectifier.

    TUNABLE SCHOTTKY DIODES FABRICATED FROM ELECTROSPUN CROSSED SnO2 /PEDOT-PSSA NANORIBBONS

    Katherine V. Carrasquillo

    Mentor: Nicholas J. Pinto Department of Physics and Electronics, University of Puerto Rico-Humacao

    Hardware in most solid state devices contains at least one interface between a p-type and an n-type semiconductor. Such hetero-junctions are typically fabricated from all inorganic Si based materials. In the past two decades however, devices fabricated from organic-inorganic semiconductors that are not Si based, or from all organic semiconductors have been the focus of much research. Semicon-ducting n-doped metal oxides are also attractive for use in devices and of particular interest is tin oxide (SnO2) as it is stable in air and is optically transparent with a band gap of ~3.4 eV. The

    SCHOTTKY DIODES AND SENSORS FABRICATED FROM ELECTROSPUN PEDOT-PSSA NANOFIBERS AND THEIR CHARACTERIZATION IN TOXIC GASEOUS ENVIRONMENTS

    Yarely Davila1, Danair Rivera2 Mentor: Nicholas J. Pinto2

    1Department of Biology, University of Puerto Rico-Humacao 2Department of Physics and Electronics, University of Puerto Rico-Humacao

    Sub 50nm diameter nanofibers of the commercially available p-doped conducting polymer poly(3,4-ethylenedioxythiophene) doped with (poly styrene sulfonic acid)-PEDOT-PSSA have been electrospun in air and used in the fabrication of Schottky diodes and sensors. The diodes were tested in the presence of several toxic gases like NO2 and aliphatic alcohols. The rectification ratio of the diodes were tunable and the response reversible in the presence of these gases with no damage to the device. Some of the fibers were also used in the fabrication of sensors. Due to the large surface to volume ratio and small quantity of active material used in their fabrication, these sensors have a similar or faster response time when compared to

    alcohol sensors based on PEDOT. Increasing the size of the alcohol molecule leads to longer response times, which is attributed to slower diffusion of the larger molecule into the polymer. The same sensors were annealed in air at 70C and used to sense NH3, HCl and NO2 gases and attest to its robust nature. The use of these fibers as diodes and as gas sensors makes them multi-functional, and the ability to easily fabricate true nanofibers of PEDOT-PSSA opens up a variety of new applications where size, speed and low power consumption are important performance criteria.

    Page 4 RESULTADOS DE INVESTIGACIONES SUBGRADUADA REALIZADA EN LOS CURSOS FISI 4161-64

  • FABRICATION AND ELECTRICAL CHARACTERIZATION OF SEMICONDUCTING ZnO THINFILMS AND NANOFIBERS

    Yarely C. Dvila1, Joshua Robles2 Mentor: Nicholas J. Pinto2, and Idalia Ramos2

    1Department of Biology, University of Puerto Rico Humacao 2Department of Physics and Electronics, University of Puerto Rico Humacao

    The inorganic compound, ZnO, has been known for several favorable properties, one of them being its high electron mobility. We have fabricated fibers and thin films of this material using electrospinning. A solution was prepared using Cellulose Acetate (CA) as the base polymer, and mixing it with Zinc Chloride (ZnCl2) in Dymethylacetamide (DMA) and Acetone. The fibers were fabricated through the electrospin-ning method which consists of an electric field between the polymer solution and a collector plate. The samples were collected on silicon substrates and sintered at 600C in air for two hours. A TEM grid

    was placed over preselected fibers and used as a shadow mask, and 100 nm of gold were deposited by vacuum evaporation to create contact pads over the fibers. External contacts were made with silver paint and gold wires. Current-voltage (I-V) measurements on the fibers and films demonstrated n-doped behavior when a back gate bias was applied. This is very impor-tant as we plan to fabricate diodes and other electronic devices and sensors using this material. The fibers and films were also characterized using X-Ray diffraction (XRD) confirming the presence of Zinc Oxide.

    RESULTADOS DE INVESTIGACIONES SUBGRADUADA REALIZADA EN LOS CURSOS FISI 4161-64

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    Nanofibers find several potential applications including engineered tissue for medicine, devices for electronics, sensors and filters for chemical detec-tion, etc. In this work we are are investigating the formation of nanofibers using aqueous solutions containing p