The Influence of the Au Nanoparticles Dimension on the Photocatalytic Performances of TiO2-Au Porous Composites
G. Melintea, M. Baiaa, D. Georgescua, L. Baiaa, V. Iancua, L. Diamandescub, T. Popescub, L.C. Cotetc, L. Barbu-Tudorand, V. Danciuc and S. Simona
aFaculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania
bNational Institute of Materials Physics, Atomistilor 105 bis, P.O. Box MG. 7, 77125 Bucharest, Romania
cFaculty of Chemistry and Chemical Engineering, Babes-Bolyai University, A. Janos 11, 400028 Cluj-Napoca, Romania
dFaculty of Biology and Geology, Babes-Bolyai University, Clinicilor 5-7, 400006 Cluj-Napoca, Romania
Full Text PDF
The influence of Au nanoparticles dimension on the photocatalytic performances of the TiO2 aerogels-Au composites was evaluated. Structural and morphological peculiarities of the TiO2 aerogel, unloaded and loaded with 5 and 22 nm Au nanoparticles, were studied by transmission electron microscopy technique, X-ray diffraction and N2-sorption measurements. UV-Vis diffuse reflectance measurements were performed to determine the band gap energies. The photocatalytic activity was evaluated by monitoring the salicylic acid photodegradation. It was found that the Au nanoparticles promote the anatase phase crystallization and produce the decrease of the specific surface area and band gap energy values. The porous composite with the smallest Au nanoparticles dimension exhibits the best photocatalytic performances.
DOI: 10.12693/APhysPolA.121.208
PACS numbers: 81.05.Rm, 81.07.Wx, 82.80.Ej, 68.37.Lp, 82.65.+r, 82.50.Hp