Browsing by Author "Retamal, María José"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Tailoring of titanium dioxide thin film in dual radiofrequency plasma enhanced pulsed laser deposition
    (2025) Villegas Dissett, Rodrigo Benjamín; Tomlinson Cornejo, Matías Paul; Ureta De La Fuente, Valentina Isidora; Carrasco Navarro, Camilo Antonio; Miranda, Maximiliano; Fernández Adell, José Ignacio; Saavedra, Daniel; Retamal, María José; Inestrosa-Izurieta, Maria Jose; Singh, Dinesh Pratap; Angel Figueroa, Felipe Alfonso; Volkmann, Ulrich Georg; Takamura, Yayoi; Bhuyan, Heman
    Efficient and cost-effective methods to create photovoltaic materials are constantly being sought, with metal oxides like TiO2 playing a key role in this field. In this study, TiO2 thin films were grown on glass substrates using a dual radiofrequency (RF) plasma-enhanced pulsed laser deposition (PLD) system with a thermal budget that remained below 400 °C. The physical, chemical, and optical properties of the deposited thin films were studied as a function of low- and high-RF powers as well as deposition time. These parameters were found to impact the proportion of anatase and rutile phase and their crystallinity, as well as the oxygen vacancy concentration and band gap energy. These findings demonstrated the utility of dual RF plasma-enhanced PLD for precise modulation of TiO2 thin-films, offering promising applications in photovoltaics and photocatalysis
  • Thumbnail Image
    Item
    Wrinkled TiNAgNW Nanocomposites for High-Performance Flexible Electrodes on TEMPO-Oxidized Nanocellulose
    (2024) Gence Loik, Herve Patrick; Quero, Franck; Escalona Álvarez, Miguel Benito; Wheatley, Robert; Seifert, Birger; Díaz Droguett, Donovan Enrique; Retamal, María José; Wallentowitz, Sascha; Volkmann, Ulrich Georg; Bhuyan, Heman
    Flexible electrodes are essential for the development of future wearable such as implantable medicaldevices. While silver nanowire (AgNW) networks are promising candidates for transparent conductive electrodes (TCEs), they suffer from issues such as high roughness, low adhesion, and atmospheric corrosion sensitivity. Many flexible electrodes are made of a wrinkled conductive layer on top of a compliant s ubstrates. Wrinkles provide a way to maintain the integrity and conductivity of the electrode while it is being stretched or bent. In this study, we report on the characterization ofFE-SEMi-transparent electrodes produced by a novel plasma-enhanced pulsed laser deposition (PE-PLD) technique compatible with cellulose nanopaper (CNP) substrates. We combined AgNW with titanium nitride (TiN) layers to form wrinkled conducting nano-composite coatings with excellent electro-mechanical properties. Our results show that the incorporation of AgNW into TiN coatings improves the electrode’s electro-mechanical robustness. Additionally, our data show that CNP/TiNAgNW electrodesexhibit improved stability in air compared to bare AgNW coatings with improved adhesion. These findings have important implications for the development of bio-compatible flexible electronics and could pave the way for the creation of new wearable and implantable medical devices.