An accessible approach to preparing water-soluble Mn2+-doped (CdSSe)ZnS (core)shell nanocrystals for ratiometric temperature sensing.
A new synthetic scheme allowing structural modifications to temperature-sensitive and water-soluble D-penicillamine-passivated Mn(2+)-doped (CdSSe)ZnS (core)shell nanocrystals (MnQDs) was reported using air-stable chemicals. The temperature-dependent optical properties of the nanocrystals were tuned by changing their structure and composition--the ZnS shell thickness and the Mn(2+)-dopant concentration. Thick ZnS shells significantly reduce the interference of nonradiative transitions on ratiometric emission intensities. High-dopant concentration affords consistent temperature sensitivity. In addition to the new base structure for quantum dot ratiometric temperature sensing via flexible, glovebox-free routes, the results also underscore the generalizability of the emission intensity ratio scheme for temperature sensing, originally proposed for rare-earth-doped materials.
Department of Chemistry, Princeton University, New Jersey 08544, United States.
Chih-Hao
CH
Hsia
Anna
A
Wuttig
Haw
H
Yang
D004867:Equipment Design; D019544:Equipment Failure Analysis; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation; D010316:Particle Size; D045663:Quantum Dots; D012995:Solubility; D013696:Temperature; D013817:Thermography / Q000295:instrumentation*; D013821:Thermometers; D014867:Water / Q000737:chemistry
D014867:Water