Plasmonic giant quantum dots: hybrid nanostructure
Post# of 22465
Posted On: 03/05/2015 2:23:43 PM
Plasmonic giant quantum dots: hybrid nanostructures for truly simultaneous optical imaging, photothermal effect and thermometry†
"In summary, we have previously demonstrated the potential of photostable giant or thick-shell CdSe/CdS QDs for the range of applications from solid-state lighting to live-cell single-particle tracking.11–13 Here, we show that such novel emitters are ideal components for hybrid semiconductor–metal nanocomposites for which the ensemble and single-dot gQD optical properties can be retained and new functionality realized. Namely, a photothermal heating effect and an ‘on-board’ temperature sensing capability located precisely at the point of heating (which could be further improved by including advanced dual-emitting nanoscale temperature sensors49) are added. Furthermore, as theoretically and experimentally shown, photo-thermal transduction is comparable to that achieved by larger metal-shell constructs comprising substantially thicker Au shells. The compact size realized here (<100 nm hydrodynamic diameter) affords colloidal stability in a range of liquid media and, thereby, enhanced potential for in vivo applications as well as solution-based processing into optically transparent monoliths. Finally, although the key g-QD property of blinking-suppressed emission was retained in all cases, in developing the pl-gQDs we observed a range of effects with respect to introduction of new emissive states (beneficially faster but reduced in intensity) that are the subject of ongoing investigations."
http://pubs.rsc.org/en/content/articlehtml/20...c5sc00020c
"In summary, we have previously demonstrated the potential of photostable giant or thick-shell CdSe/CdS QDs for the range of applications from solid-state lighting to live-cell single-particle tracking.11–13 Here, we show that such novel emitters are ideal components for hybrid semiconductor–metal nanocomposites for which the ensemble and single-dot gQD optical properties can be retained and new functionality realized. Namely, a photothermal heating effect and an ‘on-board’ temperature sensing capability located precisely at the point of heating (which could be further improved by including advanced dual-emitting nanoscale temperature sensors49) are added. Furthermore, as theoretically and experimentally shown, photo-thermal transduction is comparable to that achieved by larger metal-shell constructs comprising substantially thicker Au shells. The compact size realized here (<100 nm hydrodynamic diameter) affords colloidal stability in a range of liquid media and, thereby, enhanced potential for in vivo applications as well as solution-based processing into optically transparent monoliths. Finally, although the key g-QD property of blinking-suppressed emission was retained in all cases, in developing the pl-gQDs we observed a range of effects with respect to introduction of new emissive states (beneficially faster but reduced in intensity) that are the subject of ongoing investigations."
http://pubs.rsc.org/en/content/articlehtml/20...c5sc00020c
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