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- Title
Synthesis and Functionalization of Copper-Doped Indium Phosphate Quantum Dots with Ratiometric Fluorescence.
- Authors
Xu, Bin; Xue, Jingwen; Huang, Jun; Jin, Haojun; Shen, Peng; Sun, Qingjiang
- Abstract
The doped quantum dots (QDs) that feature dual emission in one nanocrystal and long fluorescence lifetime have gained great interest in biosensing and bioimaging applications. In this work, we report the synthesis and functionalization of copper ion-doped indium phosphate (Cu:InP) QDs that exhibit simultaneous green InP emission and red Cu 2 + emission. The oil-soluble QDs were synthesized by adsorbing Cu 2 + onto InP core, followed by growing zinc selenide (ZnSe) shell via the successive ion layer adsorption reaction. During the synthesis, fluorescence ratiometry (and resultant multiple fluorescence colors) can be generated by changing either the dopant amount or the shell-growth time, but they act in a different manner: increasing the Cu 2 + amount results in quenched InP emission and oppositely improved Cu 2 + emission; the increase of shell-growth time leads to continuously improved Cu 2 + emission relative to constant InP emission. Further, functionalization of the oil-soluble Cu:InP QDs with dihydrolipoic acid-polyethylene glycol (DHLA-PEG) via ligand exchange produces the water-soluble and biocompatible dual-emission QDs. The PEGylated Cu:InP QDs present desirable charge neutrality and excellent thermal stability and photostability, thereby holding high potential in a diversity of biomedical applications. In this work, the synthesis and functionalization of Cu:InP QDs that exhibit simultaneous green InP emission and red Cu2+ emission were reported. Ratiometric Fluorescence (resultant multiple fluorescence colors) can be adjusted by changing either the dopant amount or the shell-growth time. PEGylation via the ligand exchange was used to realize the water solubility as well as biocompatibility of the QDs.
- Subjects
QUANTUM dot synthesis; QUANTUM dots; FLUORESCENCE; INDIUM; ZINC selenide; COMMODITY exchanges; INDIUM oxide
- Publication
NANO, 2019, Vol 14, Issue 12, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292019501595