Synthesis of Au nanoparticle doped SiO2–TiO2 films: tuning of Au surface plasmon band position through controlling the refractive index

Gold‐Nanoparticle‐Doped TiO2 Semiconductor Thin Films: Optical Characterization

“…[27] Furthermore, there is no evidence for thermally induced shape changes that would cause red-shifts, [15,28] nor is there evidence for polydispersity. [9,15] The porosity values of the titania films calculated both from measured and estimated n med values are in close agreement except for samples heated at 500°C. XRD analysis performed on TiO 2 -Au films allows the microstructural evolution of the films during the annealing process to be monitored.…”

“…In the majority of sol-gel syntheses, the metal is introduced in the form of a soluble salt, then reduced to form small metal particles in situ through annealing, gaseous reduction, or through photochemical reactions, [3,[8][9][10] although there are some alternative strategies for particle doping such as ion implantation [11,12] and sputtering. [1] However, all these physical and chemical methods suffer the same inherent limitations: there is very limited control of the nucleation process, the final particle size, the particle polydispersity, and the particle shape.…”

Phthalocyanine–Gold Nanoparticle Hybrids: Modulating Quenching with a Silica Matrix Shell.

“…It has been commonly observed that the positiono ft he surface plasmon band depends on the refractive index of the medium. [33] The amounto fo rganic material on the solidH ybrid 2 was determined by thermogravimetry (TG). Figure 2s hows the TG profile of solid Hybrid 2.U pon heating att emperatures over 175 8C, solid Hybrid 2 undergoes aw eight loss of about 6%.…”

“…In this way,i rradiationa tt he surface plasmon band of the AuNPsl eads to an increase of light absorbed by ZnPc, and consequently,a lso to an increase of ZnPc emission. [33] Thus, although ZnPc shows only aw eak absorption at 570 nm, with no observable emission upon excitation at this wavelength for solutions of ZnPc, when solid Hybrid 2 is irradiated at 570 nm, the characteristic emission of ZnPc was again observed.…”

Rationales Design dünner funktioneller Oxidfilme mit eingebetteten magnetischen oder plasmonischen Metallnanopartikeln

“…Die OPR (Abbildung 4 (2b)) weist eine lineare Zunahme mit zunehmendem Anteil der Titanvorstufe in der Ausgangslçsung auf. Diese lineare Abhängigkeit ist in Über-einstimmung mit den berechneten und experimentellen Ergebnissen von Cao et al [25] und Medda et al [10] Die hier vorgestellte Abscheidungsstrategie hat ein großes Potential für die Synthese immobilisierter Nanopartikel reaktiver und edler Übergangsmetalle der Kategorie M1, die in die Volumenphase dünner funktioneller Oxidfilme der Metalle M2 eingebettet sind. Eine präzise Kontrolle der Nanopartikelgrçße sowie der Zusammensetzung der Nanopartikel und der einbettenden Oxidmatrix wurde demonstriert.…”