Protoporphyrin IX-Functionalized AgSiO2 Core-Shell Nanoparticles: Plasmonic Enhancement of Fluorescence and Singlet Oxygen Production

2016 ◽  
Vol 92 (2) ◽  
pp. 247-256 ◽  
Author(s):  
Marjorie Lismont ◽  
Laurent Dreesen ◽  
Benoît Heinrichs ◽  
Carlos A. Páez
Keyword(s):  
Singlet Oxygen ◽  
Protoporphyrin Ix ◽  
Core Shell ◽  
Oxygen Production ◽  
Plasmonic Enhancement ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Au nanobipyramids@mSiO2 core–shell nanoparticles for plasmon-enhanced singlet oxygen photooxygenations in segmented flow microreactors

2020 ◽  
Vol 2 (11) ◽  
pp. 5280-5287
Author(s):  
Carlos Mendoza ◽  
Anthony Désert ◽  
Denis Chateau ◽  
Cyrille Monnereau ◽  
Lhoussain Khrouz ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Continuous Flow ◽  
Core Shell ◽  
Segmented Flow ◽  
Shell Nanoparticles ◽  
Gold Nanobipyramids ◽  
Core Shell Nanoparticles ◽  
Flow Microreactors

Gold nanobipyramids coated with 12 nm mSiO2 shells exhibited metal-enhanced 1O2 generation in continuous-flow photooxygenation reactions.

Synthesis of Fe3O4/ZnO Core-shell Nanoparticles for Photodynamic Therapy Applications

2010 ◽  
Vol 1257 ◽  
Author(s):  
Juan C. Beltran Huarac ◽  
Surinder P. Singh ◽  
Maharaj S. Tomar ◽  
Sandra Peňa ◽  
Luis Rivera ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Photoelectron Spectroscopy ◽  
Green Emission ◽  
Core Shell ◽  
Light Sources ◽  
X Ray Diffraction ◽  
Shell Nanoparticles ◽  
X Ray ◽  
Core Shell Nanoparticles

AbstractThe use of nanoparticles as carriers of photosensitizer (PS) molecules for photodynamic therapy (PDT) has attracted much interest on core-shell nanosize structures. Herein, we used a simple aqueous solution method to synthesize Fe3O4/ZnO core-shell nanoparticles. X-ray diffraction (XRD) analyses showed the presence of well defined peaks corresponding to Fe3O4 and ZnO in as-synthesized nanocrystals. Vibrating sample magnetometer (VSM) measurements showed that these nanoparticles exhibited superparamagnetic behavior of the core with no coercivity nor remanence. X-ray photoelectron spectroscopy (XPS) analyses revealed the presence of Zn1/2 and Zn3/2 species on the surface of nanocrystals. Photoluminescence measurements showed excitonic emission of ZnO co-existing with a weak and broad defect- related green emission at room temperature. The generation of singlet oxygen was monitored via the photooxidation of diphenyl-1,3-isobenzofuran (DPBF) with different light sources, followed by absorption spectroscopy at 409 nm. The capability of synthesized nanoparticles to generate singlet oxygen has also been verified.

Plasmonic enhancement using core-shell nanoparticles

2005 ◽  
Author(s):  
Ondrej Stranik ◽  
Robert Nooney ◽  
Colette McDonagh ◽  
Brian D. MacCraith
Keyword(s):  
Core Shell ◽  
Plasmonic Enhancement ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Helium droplet assisted synthesis of plasmonic Ag@ZnO core@shell nanoparticles

Nano Research ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2979-2986 ◽  
Author(s):  
Alexander Schiffmann ◽  
Thomas Jauk ◽  
Daniel Knez ◽  
Harald Fitzek ◽  
Ferdinand Hofer ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Particle Morphology ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Plasmonic Enhancement ◽  
Shell Nanoparticles ◽  
Scanning Transmission ◽  
High Kinetic Energy ◽  
Particle Size And Shape ◽  
Core Shell Nanoparticles

Abstract Plasmonic Ag@ZnO core@shell nanoparticles are formed by synthesis inside helium droplets with subsequent deposition and controlled oxidation. The particle size and shape can be controlled from spherical sub-10 nm particles to larger elongated structures. An advantage of the method is the complete absence of solvents, precursors, and other chemical agents. The obtained particle morphology and elemental composition have been analyzed by scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDS). The results reveal that the produced particles form a closed and homogeneous ZnO layer around a 2–3 nm Ag core with a uniform thickness of (1.33 ± 0.15) nm and (1.63 ± 0.31) nm for spherical and wire-like particles, respectively. The results are supported by ultraviolet photoelectron spectroscopy (UPS), which indicates a fully oxidized shell layer for the particles studied by STEM. The plasmonic properties of the produced spherical Ag@ZnO core@shell particles are investigated by two-photon photoelectron (2PPE) spectroscopy. Upon excitation of the localized surface plasmon resonance in Ag at around 3 eV, plasmonic enhancement leads to the liberation of electrons with high kinetic energy. This is observed for both Ag and Ag@ZnO particles, showing that even if a Ag cluster is covered by the ZnO layer, a plasmonic enhancement can be observed by photoelectron spectroscopy.

Plasmonic enhancement of the optical absorption and catalytic efficiency of BiVO4 photoanodes decorated with Ag@SiO2 core–shell nanoparticles

2014 ◽  
Vol 16 (29) ◽  
pp. 15272-15277 ◽  
Author(s):  
Fatwa F. Abdi ◽  
Ali Dabirian ◽  
Bernard Dam ◽  
Roel van de Krol
Keyword(s):  
Optical Absorption ◽  
Catalytic Efficiency ◽  
Core Shell ◽  
Plasmonic Enhancement ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Plasmonic Ag@SiO2 core–shell nanoparticles enhance the performance of BiVO4 photoanodes by an impressive ∼250%, through improved optical absorption and more efficient catalysis.

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