Study of titania nanorod films deposited by matrix-assisted pulsed laser evaporation as a function of laser fluence
| Autor: | Anna Paola Caricato, Antonietta Taurino, Maura Cesaria, Maria Grazia Manera, Armando Luches, Pantaleo Davide Cozzoli, Roberto Rella, Maurizio Martino, Massimo Catalano, Maria R. Belviso |
|---|---|
| Přispěvatelé: | Caricato, Anna Paola, M. R., Belviso, M., Catalano, Cesaria, Maura, Cozzoli, Pantaleo Davide, A., Luche, M. G., Manera, Martino, Maurizio, Rella, Roberto, A., Taurino |
| Rok vydání: | 2011 |
| Předmět: |
TiO2 nanocrystal
Materials science Excimer laser Brookite medicine.medical_treatment Analytical chemistry Nanotechnology General Chemistry gas sensing. thin films Evaporation (deposition) Fluence chemistry.chemical_compound chemistry Transmission electron microscopy Rutile pulsed laser visual_art Titanium dioxide visual_art.visual_art_medium medicine General Materials Science Nanorod |
| Zdroj: | Applied physics. A, Materials science & processing info:cnr-pdr/source/autori:AP Caricato, MR Belviso, M. Catalano, M Cesaria, PD Cozzoli, A Luches, MG Manera, M Martino, R Rella, A. Taurino/titolo:Study of titania nanorod films deposited by matrix-assisted pulsed laser evaporation as a function of laser fluence/doi:10.1007%2Fs00339-011-6597-4/rivista:Applied physics. A, Materials science & processing (Print)/anno:2011/pagina_da:605/pagina_a:610/intervallo_pagine:605–610/volume:105 |
| ISSN: | 1432-0630 0947-8396 |
| DOI: | 10.1007/s00339-011-6597-4 |
| Popis: | Chemically synthesized brookite titanium dioxide (TiO2) nanorods with average diameter and length dimensions of 3–4 nm and 35–50 nm, respectively, were deposited by the matrix-assisted pulsed laser evaporation technique. A toluene nanorod solution was frozen at the liquid-nitrogen temperature and irradiated with a KrF excimer laser (λ=248 nm, τ=20 ns) at the repetition rate of 10 Hz, at different fluences (25 to 350 mJ/cm2). The deposited films were structurally characterized by high-resolution scanning and transmission electron microscopy. 〈100〉 single-crystal Si wafers and carbon-coated Cu grids were used as substrates. Structural analyses evidenced the occurrence of brookite-phase crystalline nanospheres coexisting with individually distinguishable TiO2 nanorods in the films deposited at fluences varying from 50 to 350 mJ/cm2. Nanostructured TiO2 films comprising only nanorods were deposited by lowering the laser fluence to 25 mJ/cm2. The observed shape and phase transitions of the nanorods are discussed taking into account the laser-induced heating effects, reduced melting temperature and size-dependent thermodynamic stability of nanoscale TiO2. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|