title: Au nanorod decoration on NaYF₄:Yb/Tm nanoparticles for enhanced emission and wavelength-dependent biomolecular sensing.
abstract: 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.
authors.forename: Palanisamy
authors.initials: P
authors.lastname: Kannan
authors.forename: Ferhan
authors.initials: F
authors.lastname: Abdul Rahim
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.forename: Xue
authors.initials: X
authors.lastname: Teng
authors.forename: Ling
authors.initials: L
authors.lastname: Huang
authors.forename: Handong
authors.initials: H
authors.lastname: Sun
authors.forename: Dong-Hwan
authors.initials: DH
authors.lastname: Kim
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D050091:Dendrimers / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D057230:Limit of Detection; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis; D013932:Thulium / Q000737:chemistry*; D014527:Uric Acid / Q000032:analysis; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D050091:Dendrimers; C104700:PAMAM Starburst; C525362:sodium yttriumtetrafluoride; D014527:Uric Acid; D015019:Yttrium; D006046:Gold; D013932:Thulium; D015018:Ytterbium; D005459:Fluorides