Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 36, Pages 10829-10835Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta11684k
Keywords
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Funding
- C'nano - Ile de France
- RTRA Triangle de la Physique
- Welch Foundation Agency [AX-1615]
- NSF [PREM 0934218, 1103730]
- National Institute on Minority Health and Health Disparities from NIH [G12MD007591]
- National Institute on Minority Health and Health Disparities [G12MD007591] Funding Source: NIH RePORTER
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Au, Cu and bimetallic Au-Cu nanoparticles were synthesized on the surface of commercial TiO2 compounds (P25) by reduction of the metal precursors with tetrakis(hydroxymethyl) phosphonium chloride (THPC) (0.5% in weight). The alloyed structure of Au-Cu NPs was confirmed by HAADF-STEM, EDS, HRTEM and XPS techniques. The photocatalytic properties of the modified TiO2 have been studied for phenol photodegradation in aqueous suspensions under UV-visible irradiation. The modification by the metal nanoparticles induces an increase in the photocatalytic activity. The highest photocatalytic activity is obtained with Au-Cu/TiO2 (Au-Cu 1 : 3). Their electronic properties have been studied by time resolved microwave conductivity (TRMC) measurements to follow the charge-carrier dynamics. TRMC measurements show that the TiO2 modification with Au, Cu and Au-Cu nanoparticles plays a role in charge-carrier separations increasing the activity under UV-light. Indeed, the metal nanoparticles act as a sink for electrons, decreasing the charge carrier recombination. The TRMC measurements also show that the bimetallic Au-Cu nanoparticles are more efficient in electron scavenging than the monometallic Au and Cu ones.
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