title: Titania-coated gold nanorods with expanded photocatalytic response. Enzyme-like glucose oxidation under near-infrared illumination.
abstract: Gold nanorods coated with a uniform titanium dioxide nanoshell have been prepared and used as glucose-oxidase surrogates. Remarkably, this core-shell photocatalytic nanostructure has been able to induce complete oxidation of glucose at near room temperature (32-34 °C) in a wide range of pH values with the aid of a near-infrared (NIR) irradiation source. In contrast, the uncoated gold nanorods exhibit negligible photo-oxidation response under identical experimental conditions thereby proving the photoactivity of the titania shell towards glucose oxidation. The process takes place via in situ photo-generation of singlet oxygen or hydroxyl radicals as reactive oxidative species (ROS). This underlines the role played by the core nanorods as plasmonic light harvesters in the NIR range and constitutes the first example of a NIR-activated enzyme-like catalyst.
authors.affiliation: Institute of Nanoscience of Aragon (INA) and Department of Chemical Engineering and Environmental Technology, University of Zaragoza, 50018 Zaragoza, Spain. jesus.santamaria@unizar.es jlhueso@unizar.es and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Centro de Investigación Biomédica en Red, C/Monforte de Lemos 3-5, Pabellón 11, 28029 Madrid, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Ortega-Liebana
authors.affiliation: Institute of Nanoscience of Aragon (INA) and Department of Chemical Engineering and Environmental Technology, University of Zaragoza, 50018 Zaragoza, Spain. jesus.santamaria@unizar.es jlhueso@unizar.es and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Centro de Investigación Biomédica en Red, C/Monforte de Lemos 3-5, Pabellón 11, 28029 Madrid, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Hueso
authors.affiliation: Laboratorio de Microscopías Avanzadas, Instituto de Nanociencia de Aragón, Universidad de Zaragoza, 50018 Zaragoza, Spain and ARAID Foundation, 50018 Zaragoza, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Arenal
authors.affiliation: Institute of Nanoscience of Aragon (INA) and Department of Chemical Engineering and Environmental Technology, University of Zaragoza, 50018 Zaragoza, Spain. jesus.santamaria@unizar.es jlhueso@unizar.es and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Centro de Investigación Biomédica en Red, C/Monforte de Lemos 3-5, Pabellón 11, 28029 Madrid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Santamaria
mesh_terms: D005947:Glucose / Q000378:metabolism*; D006046:Gold; D007259:Infrared Rays; D043942:Nanotubes; D014025:Titanium
chemical_list: C009495:titanium dioxide; D006046:Gold; D014025:Titanium; D005947:Glucose