Plasmon-induced resonant effects on the optical properties of Ag-decorated ZnSe nanowires

Abstract

In this work we present how the optical properties of ZnSe nanowires are modified by the presence of Ag nanoparticles on the sidewalls of the ZnSe nanowires. In particular we show that the low-temperature luminescence of the ZnSe nanowires changes its shape, enhancing the phonon-replicas of impurity related recombination and affecting rise and decay times of the transient absorption bleaching at room temperatures, with an increase of the former and a decrease of the latter. In contrast, the deposition of Au NPs on the ZnSe nanowires does not change the optical properties of the sample. We suggest that the mechanism underlying these experimental observations is energy transfer via the Förster interaction based on the fact that the localized surface plasmon resonance (LSPR) of Ag nanoparticles spectrally overlaps with absorption and emission of ZnSe while the Au LSPR does not.

Gold-diamond Nanocomposites Efficiently Generate Hydrated Electrons upon Absorption of Visible Light

“…Absorption at the surface of the NP can be greatly enhanced by this mechanism, with enhancement factors in excess of 1000 being observed . More complex mechanisms, such as hot electron injection from the Au to the diamond, chemical enhancement (in analogy to SERS chemical enhancement), or resonant energy transfer, cannot be ruled out a priori but are not needed to explain the enhancement observed.…”

Spintronic hydrogen evolution induced by surface plasmon of silver nanoparticles loaded on Fe- and Co-doped ZnO nanorods

“…Consequently, the hot electrons transfer mechanism of plasmonic in semiconductor can be principally excluded. 24,25 ZnO of nanostructures, such as nanorods, nanowires, nanospheres and nanoflowers, 26 has promising applications among semiconductor materials in the regime of photocatalysis, photoelectronics, solar cells, supercapacitors, battery, spintronics, piezoelectricity, sensors and biomedicine. 19,[27][28][29][30][31][32] ZnO has been also considered as a promising diluted magnetic semiconductor (DMS) by introducing with 1~10 % of transitional metals (TM).…”

Ultrafast optical spectroscopy of semiconducting and plasmonic nanostructures and their hybrids

“…As can be seen from the above discussion, the dynamics of both the plasmonic NPs and the semiconductor nanostructures on the femtosecond timescales are both complicated and intensity dependent and can be influenced by numerous factors. To gain some insight into the extraction of reliable information on these dynamics from optical pump-probe methods we structure this article in the following manner: first, transient absorption (TA) spectroscopy (the main experimental optical technique used in our studies) is briefly described, we then summarize some of our measurements on plasmonic metal NPs [16][17][18][19], this is followed by a discussion of the dynamics extracted from our optical measurements on a range of nanostructured semiconductors [20][21][22], we then analyze the dynamics in hybrid systems [23,24] with the aim of achieving an understanding of the parameters governing the modification of the dynamics due to interactions in these systems and, finally, we describe the carrier dynamics of TiO 2 NPs and V-doped TiO 2 NPs and how they affect their catalytic properties.…”