J Phys Chem C 2010, 114:4297–4301.CrossRef 40. Biffis A, Minati L: Efficient aerobic oxidation of alcohols in water catalysed by microgel-stabilised metal nanoclusters. J Catal 2005, 236:405–409.CrossRef Competing interests The authors declare that
they have no competing interests. Authors’ contributions LR carried out the synthesis and characterization of porous silica microspheres. CT participated in the morphology characterization. LZ drafted the manuscript. JH and You Wang participated in the UV and TGA analyses. XZ participated in the XRD characterization. Yong Wang and BJ conceived click here of the study and helped draft the manuscript. MH and JZ participated in the design of the study. All authors read and approved the final manuscript.”
“Background Enhancement of the intensity and emission rate of quantum emitters is of significant selleck interest during the past decade. One of the approaches to enhance luminescence efficiency of low-dimensional materials is to realize the coupling of electronic excitation in quantum dots and wells with the surface plasmons (SPs) supported by metal nanostructures. Metal nanostructures can be of two types: planar metal films and non-planar metal nanostructures such as nanoparticle arrays and thin semicontinuous metal films consisting of disorder-shaped nanostructures. When
a planar metal film is placed above a luminescent material, the emission decay rate of it increases due to excitation of the propagating mode surface plasmons [1, 2]. Surface plasmon excitations in bounded geometries such as nanostructured metal particles are localized surface plasmons (LSPs). The resonant excitation HKI-272 ic50 of LSPs on the surface of nanostructured metallic particles by an incident light causes strong light scattering and absorption and enhanced local electromagnetic fields . In non-planar metal nanostructures, localized modes
of the SPs play an important role in changing the decay rate of luminescent material. The decay rate characteristics for non-planar metal nanostructures are different from those for planar films, e.g., strong dependence of the decay rate on wavelength , polarization , and fluctuation of Meloxicam decay rate distribution . Changes in the photoluminescence (PL) intensity and the spontaneous decay rate due to deposition of metal nanostructures are observed in a semiconductor nanocrystals and organic materials [7–9]. It has been shown that the PL intensity of silicon nanocrystals can be considerably enhanced by placing an Ag island array with different sizes and pitches . Further, polarization-selective enhancement of PL was realized by using an anisotropic metal structure . There are no investigations on the effect of metal nanoparticles on the radiative recombination of silicon nanoparticles in anisotropic dielectric matrix. In this paper, we studied the emission decay rate of ncs-Si embedded into the SiO x matrix possessing a porous column-like structure covered with a thin Au film.