Journal
NANO LETTERS
Volume 21, Issue 1, Pages 476-484Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03930
Keywords
gold nanoclusters; fluorescence; xanthate; charge transfer; monodispersity; poly(2-oxazoline)
Categories
Funding
- Alexander von Humboldt Foundation
- CSIRO Manufacturing
- National Health & Medical Research Council (NHMRC) of Australia [APP1148582]
- Australian Research Council (ARC) Future Fellowship [FT190100572]
- NHMRC [GNT1112432]
- Australian Research Council (ARC) Centre of Excellence in Convergent Bio-Nano Science and Technology [CE140100036]
- ARC Training Centre for Innovation in Biomedical Imaging Technologies [IC170100035]
- ARC Centre of Excellence in Exciton Science [CE170100026]
- ARC Grant (FEI Tecnai G2 F20 S-TWIN FEGTEM -ARC Funding) [LE110100223]
- Monash Centre for Electron Microscopy (MCEM)
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Introduction of xanthate-functionalized poly(cyclic imino ethers)s (PCIEs) provides a new method for synthesizing highly monodisperse and fluorescent gold nanoclusters (AuNCs). These PCIE-AuNCs exhibit good colloidal stability, biocompatibility, and antifouling properties, showing potential for various theranostic applications.
We introduce xanthate-functionalized poly(cyclic imino ethers)s (PCIEs), specifically poly(2-ethyl-2-oxazoline) and poly(2-ethyl-2-oxazine) given their stealth characteristics, as an attractive alternative to conventional thiol-based ligands for the synthesis of highly monodisperse and fluorescent gold nanoclusters (AuNCs). The xanthate in the PCIEs interacts with Au ions, acting as a well-controlled template for the direct formation of PCIE-AuNCs. This method yields red-emitting AuNCs with a narrow emission peak (lambda(em) = 645 nm), good quantum yield (4.3-4.8%), long fluorescence decay time (similar to 722-844 ns), and unprecedented product yield (>98%). The PCIE-AuNCs exhibit long-term colloidal stability, biocompatibility, and antifouling properties, enabling a prolonged blood circulation, lower nonspecific accumulation in major organs, and better renal clearance when compared with AuNCs without polymer coating. The advances made here in the synthesis of metal nanoclusters using xanthate-functionalized PCIEs could propel the production of highly monodisperse, biocompatible, and renally clearable nanoprobes in large-scale for different theranostic applications.
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