Repozytorium publikacji - Politechnika Gdańska

Bimetallic nanoparticles, composed of two different metal elements, can exhibit peculiar electronic, optical, and catalytic or photocatalytic properties that are absent in the corresponding monometallic nanoparticles. We show the effect of calcination temperature (from 350 to 700°C) on the structure and the photocatalytic properties of Au/Pd-modified TiO2. The composition of the bimetallic Au/Pd nanoparticles in relation to their photocatalytic performance as well as their ability to form radical species under UV and visible light as detected by EPR technique has been investigated. Au/Pd bimetallic nanoparticles formed at the TiO2 surface in the microemulsion system have an Au-rich core and a Pd-rich shell. Increasing temperature from 350 to 700°C during calcination step, causes gold-enrichment in the surface region. Visible light initiated activity in phenol degradation reaction was observed only for Au/Pd- TiO2 samples calcinated at 350 and 400°C. Further metal re-distribution, observed upon increasing temperature from 450 to 700°C causes gold-enrichment in the surface region of Au/Pd nanoparticles, finally leading to visible light photoactivity decrease due to weaker ability of charge carriers formation during excitation of gold, compared to palladium.

Autorzy

• Anna Malankowska link otwiera się w nowej karcie ,
• Jacqueline B. Priebe,
• Marga-Martina Pohl,
• Janusz W. Sobczak,
• Matthias Schneider,
• prof. dr hab. inż. Anna Zielińska-Jurek link otwiera się w nowej karcie ,
• Angelika Bruckner,
• prof. dr hab. inż. Adriana Zaleska-Medynska link otwiera się w nowej karcie