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Au-TiO2 Nanoscale Heterodimers Synthesis from an Ambient Spark Discharge for Efficient Photocatalytic and Photothermal Activity

Byeon, Jeong Hoon, Kim, Young-Woo
ACS Applied Materials & Interfaces 2014 v.6 no.2 pp. 763-767
air flow, carbon monoxide, gold, nanocomposites, nanoparticles, oxidation, surface plasmon resonance, titanium dioxide
Ultrafine Au particles incorporating TiO₂ heterodimers were synthesized using an ambient heterogeneous spark discharge and the resultant materials were employed both in oxidizing photocatalytically CO gas and killing photothermally cancerous cells. Ti–Au spark configuration was employed to vaporize Ti and Au components into an airflow and finally ultrafine Au particles (∼2 nm in lateral dimension) were incorporated with TiO₂ nanoparticles in the form of Au-TiO₂ heterodimers (∼38 nm in lateral dimension) with enhanced photocatalytic (in CO oxidation) and photothermal activity (in cancerous cell killing) under visible light. We propose that the localized surface plasmon resonance of ultrafine Au particles on TiO₂ supports, induced by the visible light, would promote the adsorption-oxidation of CO and photothermal killing of HeLa cells. The present strategy may be suitable to fabricate other Au-metal oxide nanocomposites for catalytic and biomedical applications.