TY - JOUR
T1 - The Metal Type Governs Photocatalytic Reactive Oxygen Species Formation by Semiconductor-Metal Hybrid Nanoparticles
AU - Stone, David
AU - Ben-Shahar, Yuval
AU - Waiskopf, Nir
AU - Banin, Uri
N1 - Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/11/22
Y1 - 2018/11/22
N2 - Semiconductor-metal hybrid nanoparticles (HNPs) are promising photocatalysts for redox reactions, including water reduction for hydrogen generation and reactive oxygen species (ROS) formation. Herein we study the effect of the metal co-catalyst type on the light-induced ROS formation using a combination of spectrophotometric and fluorescence assays, as well as electron paramagnetic resonance spectroscopy. We find that although Pt tips are more efficient for H2 generation, hydrogen peroxide and hydroxyl radicals are formed more effectively by Au tipped HNPs. These variations are attributed to the different surface reactivity and selectivity related to the metal tip composition. The obtained understanding contributes to the optimal design of these hybrid nanosystems as photocatalysts in various ROS-driven applications such as photopolymerization, and environmental and biomedical scenarios.
AB - Semiconductor-metal hybrid nanoparticles (HNPs) are promising photocatalysts for redox reactions, including water reduction for hydrogen generation and reactive oxygen species (ROS) formation. Herein we study the effect of the metal co-catalyst type on the light-induced ROS formation using a combination of spectrophotometric and fluorescence assays, as well as electron paramagnetic resonance spectroscopy. We find that although Pt tips are more efficient for H2 generation, hydrogen peroxide and hydroxyl radicals are formed more effectively by Au tipped HNPs. These variations are attributed to the different surface reactivity and selectivity related to the metal tip composition. The obtained understanding contributes to the optimal design of these hybrid nanosystems as photocatalysts in various ROS-driven applications such as photopolymerization, and environmental and biomedical scenarios.
KW - Cadmium Sulfide Nanoparticles
KW - Hydrogen Peroxide Formation
KW - Noble Metal Catalysts
KW - Photocatalysis
KW - Reactive Oxygen Species
UR - http://www.scopus.com/inward/record.url?scp=85055573672&partnerID=8YFLogxK
U2 - 10.1002/cctc.201801306
DO - 10.1002/cctc.201801306
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AN - SCOPUS:85055573672
SN - 1867-3880
VL - 10
SP - 5119
EP - 5123
JO - ChemCatChem
JF - ChemCatChem
IS - 22
ER -