Plasmonic giant quantum dots: hybrid nanostructures for truly simultaneous optical imaging, photothermal effect and thermometry

Abstract

A new compact and multifunctional hybrid semiconductor–metal nanostructure is elucidated and demonstrated for real-time optical imaging, photothermal heating, and in situ thermometry.

When excitons and plasmons meet: Emerging function through synthesis and assembly

“…59 In addition, it was demonstrated both experimentally and theoretically that the interplay of the thicknesses of the SiO 2 spacer and gold shell allows precise tuning of the LSPR from the visible to the near-infrared range, as well as large gold absorption cross-sections despite a compact total particle size (40-60-nm "inorganic" diameter). 59 In contrast to the thin-gold-shell examples, Ji et al established a true "plasmonic resonator" effect in the synthetic construction of a QD enveloped in a thick SiO 2 shell (35 nm) coated with a thick gold shell (20 nm), which afforded overlap of the QD PL and the gold plasmon resonance peak. 57 In this way, they targeted strong QD-Au coupling, which they observed in the form of neutral and charged states having comparable radiative effi ciencies resulting from Purcell enhancement of radiative recombination rates compared to nonradiative Auger recombination, similar to effects observed for CdSe-ZnS QDs dispersed on nano-roughened gold fi lms.…”

“…Following a similar approach, but modifying and elucidating the highly pH-dependent gold-reduction process, Karan et al employed thicker spacers in the form of SiO 2 layers of controlled thickness (10-17.5 nm). 59 They also used thickshell or "giant" CdSe-CdS core-shell QDs (g-QDs) 62 -64 as the emitter, such that the combination of a thicker spacer layer and a more stable QD could afford complete suppression of gold-mediated quenching. 59 In addition, it was demonstrated both experimentally and theoretically that the interplay of the thicknesses of the SiO 2 spacer and gold shell allows precise tuning of the LSPR from the visible to the near-infrared range, as well as large gold absorption cross-sections despite a compact total particle size (40-60-nm "inorganic" diameter).…”

“…59 They also used thickshell or "giant" CdSe-CdS core-shell QDs (g-QDs) 62 -64 as the emitter, such that the combination of a thicker spacer layer and a more stable QD could afford complete suppression of gold-mediated quenching. 59 In addition, it was demonstrated both experimentally and theoretically that the interplay of the thicknesses of the SiO 2 spacer and gold shell allows precise tuning of the LSPR from the visible to the near-infrared range, as well as large gold absorption cross-sections despite a compact total particle size (40-60-nm "inorganic" diameter). 59 In contrast to the thin-gold-shell examples, Ji et al established a true "plasmonic resonator" effect in the synthetic construction of a QD enveloped in a thick SiO 2 shell (35 nm) coated with a thick gold shell (20 nm), which afforded overlap of the QD PL and the gold plasmon resonance peak.…”

The delivery of doxorubicin of multifunctional β‐cyclodextrin‐modified CdSe/ZnS quantum dots for bioactivity and nano‐probing

“…Nanoparticles play an important role in medicine . Quantum dots (QDs) nanoparticles have special photochemistry properties due to their special chemical and physical properties, which can be used in probing, bio‐imaging, sensing, and drug delivery, as well as diagnosis . Although QDs have generated numerous biological applications, the chief hinders are the organelle‐specific initiation of QDs, when QD nanoparticles are used in vivo .…”

One-pot synthesis of Au/Ag bimetallic nanoparticles to modulate the emission of CdSe/CdS quantum dots

“…For instance, the various QD-MNP nanohybrids with enhanced photoluminescence have been fabricated by introducing silica shells, complementary oligonucleotides or oppositely charged polyelectrolytes spacer layers to avoid the strong quenching effects. [27][28][29][30][31] However, most of these QD-NMP nanohybrids with plasmon enhanced fluorescence have been fabricated on the solid substrate and using isotropic nanospheres, only few works have reported the enhanced fluorescence of QD by using surface modified MNPs in aqueous solution so far, 32-35 while the anisotropic gold or silver nanoparticles enhanced fluorescence of QD in the solution phase was not yet reported according to our best knowledge. Moreover, it has been demonstrated in several recently published work that the plasmonic, luminescent and catalytic properties of gold can be effectively enhanced thanks to the "silver effects", which implies that the bimetallic gold/silver alloy or core-shell nanoparticles exhibit improved performance in various plasmon-mediated optical transitions compared to the gold or silver monometallic nanostructures.…”