Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 9, Pages 3508-3513Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4007758
Keywords
upconversion nanocrystals; gold nanorods; PAMAM; fluorescence enhancements; biosensor
Funding
- Ministry of Education, Singapore [MOE2012-T2-1-058]
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We introduce gold nanorods (GNRs) decoration on NaYF4:Yb/Tm upconversion nanocrystals (UCNCs) by functionalizing the UCNCs with polyamidoamine generation 1 (PAMAM G1) dendrimer, followed by a single-step seed-mediated growth of long-range GNRs to enhance biological window upconversion emission. The up-conversion emission of GNR-decorated UCNCs can be enhanced beyond the level typically obtainable using shell-like structures up to 27-fold enhancement. Also, the enhancement can be tuned at different wavelength regions by varying the GNR aspect ratio. The GNR-decorated UCNC is further modified with 2-thiouracil for nonenzymatic detection of uric acid, revealing a detection limit as 1 pM.
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